CN110994353A - A beam shaping module and optical device - Google Patents
A beam shaping module and optical device Download PDFInfo
- Publication number
- CN110994353A CN110994353A CN201911332884.XA CN201911332884A CN110994353A CN 110994353 A CN110994353 A CN 110994353A CN 201911332884 A CN201911332884 A CN 201911332884A CN 110994353 A CN110994353 A CN 110994353A
- Authority
- CN
- China
- Prior art keywords
- laser
- light
- optical waveguide
- laser beam
- shaping module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0057—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for temporal shaping, e.g. pulse compression, frequency chirping
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides a light beam shaping module and an optical device, belongs to the technical field of light beam shaping, and can reduce energy loss at two ends of flat-top distribution of light energy, improve the light-emitting uniformity of a laser beam and obtain better energy utilization efficiency on the basis of not increasing the length of the module basically. The beam shaping module comprises a flat optical waveguide and a shaping optical unit which are sequentially arranged along the direction of a light path, a laser beam emitted by a laser is coupled into the flat optical waveguide, the flat optical waveguide acts on a single direction of the laser beam, and the laser beam is emitted through the shaping optical unit. The flat optical waveguide directly performs optical processing on the laser beam emitted by the laser, so that the light energy at the edge of the shaped light spot of the laser beam emitted by the flat optical waveguide is relatively balanced, the cliff type energy loss at the edge of the light spot is avoided, the uniformity of the emitted shaped light spot is improved, and the brightness of the shaped light spot is effectively improved.
Description
Technical Field
The invention relates to the technical field of beam shaping, in particular to a beam shaping module and an optical device.
Background
In laser optical applications, such as laser beams generated by semiconductor lasers, it is generally necessary to use uniform and regular shaped spots, such as rectangular spots, circular spots, etc., which require shaping of the light beam emitted by the semiconductor laser. In the related art, a laser beam is generally shaped after a semiconductor laser using a fast axis collimating lens (FAC) and a slow axis collimating lens (SAC) in this order.
However, the laser beam obtained after the collimation of FAC and SAC has the problems of uneven light intensity in the flat top distribution region in the far field light intensity distribution and abrupt decrease in light intensity at both edges of the slow axis and/or the fast axis, which easily results in a loss of available laser energy of up to 30% in the outgoing laser beam.
In the prior art, a mode of adding a homogenizing lens after FAC and SAC is generally adopted to obtain an ideal light spot, but the mode has small contribution to improving the light intensity uniformity and reducing the energy loss, and the length of an optical module and the volume of an optical device are obviously increased, so that the applicable scene of the manufactured optical device is limited.
Disclosure of Invention
The invention aims to provide a beam shaping module and an optical device, which can reduce energy loss at two ends of flat-top distribution of light energy, improve the light-emitting uniformity of a laser beam and obtain better energy utilization efficiency on the basis of not increasing the length of the module basically.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, a beam shaping module is provided, which includes a slab optical waveguide and a shaping optical unit sequentially arranged along a light path direction, a laser beam emitted from a laser is coupled into the slab optical waveguide, the slab optical waveguide acts on a single direction of the laser beam, and the laser beam is emitted through the shaping optical unit.
Optionally, the flat optical waveguide has at least one reflection surface to adjust a light outgoing direction of the laser beam passing therethrough according to the reflection surface.
Optionally, the shaping light unit includes a collimating lens, and the collimating lens includes a fast axis collimating lens and/or a slow axis collimating lens disposed on a light exit surface of the fast axis collimating lens.
In another aspect of the embodiments of the present invention, there is provided an optical device including: the light beam shaping module further comprises a laser, and the laser is arranged on the light incident surface of the light beam shaping module.
Optionally, the light emitting surface of the laser and the light incident surface of the flat optical waveguide in the beam shaping module are attached to each other.
Optionally, the slab optical waveguide in the beam shaping module has at least one reflection surface, the light exit surface of the laser is attached to the light entrance surface of the slab optical waveguide, and the laser beam enters from the light entrance surface of the slab optical waveguide, is reflected by the reflection surface, and exits from the light exit surface of the slab optical waveguide.
Optionally, the planar optical waveguide in the beam shaping module is a right-angle prism, two right-angle sides of the right-angle prism are respectively a light incident surface and a light emitting surface, and the bevel edge is a reflecting surface, and the light emitting surface of the laser and the light incident surface of the right-angle prism are attached to each other.
Optionally, the laser comprises at least one light emitting point.
Alternatively, the laser includes a plurality of light emitting points, and the thickness direction of the flat optical waveguide corresponds to a direction perpendicular to the arrangement direction of the plurality of light emitting points.
Optionally, the plurality of light emitting points are uniformly distributed along the fast axis direction of the laser, and the thickness direction of the flat optical waveguide corresponds to the slow axis direction of the laser.
Optionally, the laser is a laser chip, and the laser chip is bonded on the heat sink structure.
The embodiment of the invention has the beneficial effects that:
in one aspect of the embodiments of the present invention, a beam shaping module is provided, which includes a slab optical waveguide and a shaping optical unit sequentially arranged along a light path direction, a laser beam emitted from a laser is coupled into the slab optical waveguide, the slab optical waveguide acts on a single direction of the laser beam, and the laser beam is emitted through the shaping optical unit. In the embodiment of the invention, the laser beam is coupled into the flat optical waveguide to be optically processed in a single direction, and the laser beam emitted from the flat optical waveguide is shaped by the shaping light unit and then emitted. Therefore, the flat optical waveguide directly performs optical processing on the laser beam emitted by the laser, so that the light energy at the edge of the shaped light spot of the laser beam emitted by the flat optical waveguide is relatively balanced, the cliff type energy loss at the edge of the light spot is avoided, the uniformity of the emitted shaped light spot is improved, and the brightness of the shaped light spot is effectively improved.
The optical device provided by the embodiment of the invention adopts the beam shaping module and further comprises a laser, and the laser is arranged on the light incident surface of the beam shaping module. The laser beam that the laser instrument was emergent gets into in the beam shaping module by the income plain noodles of beam shaping module, the beam shaping module includes dull and stereotyped optical waveguide and the plastic optical unit that sets gradually along the light path direction, the laser beam at first couples into dull and stereotyped optical waveguide and carries out the optical treatment of single direction, then it is emergent after the plastic optical unit plastic, through the processing of beam shaping module, the light energy at the shape facula edge of the laser beam that the homogenization laser instrument sent, the cliff formula energy loss at facula edge has been avoided, make the degree of consistency of the shape facula of emergent promote, and the luminance of shape facula also obtains effectual promotion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a beam shaping module according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a beam shaping module according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a beam shaping module according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an optical device according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of an optical device according to an embodiment of the present invention;
fig. 6 is a third schematic structural diagram of an optical device according to an embodiment of the present invention.
Icon: 01-a beam shaping module; 02-laser; 03-heat sink structure; 11-a slab optical waveguide; 111-the light incident surface of the slab optical waveguide; 112-reflective surface of the slab optical waveguide; 113-the light-emitting surface of the flat optical waveguide; 20-a shaping light unit; 21-fast axis collimating lens; 22-slow axis collimating lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic structural diagram of a beam shaping module 01 according to an embodiment of the present invention, and referring to fig. 1, the embodiment of the present invention provides a beam shaping module 01, which includes a slab optical waveguide 11 and a shaping optical unit 20 sequentially arranged along a light path direction, a laser beam emitted from a laser 02 is coupled into the slab optical waveguide 11, the slab optical waveguide 11 acts on a single direction of the laser beam, and the laser beam is shaped by the shaping optical unit 20 and then emitted.
The beam shaping module 01 of the embodiment of the invention can be generally matched with a laser 02 to form an optical device, is applied to the fields of laser radar, 3D perception and the like, and is used after homogenizing and shaping the emergent laser beam. For example, taking the 3D sensing function of a mobile phone as an example, in order to realize accurate face recognition or gesture recognition, higher requirements are put forward on the illumination shape and the uniformity of the light distribution of the flat top light output. It is generally recognized and used in the art that the original divergence angle of the laser beam emitted by the semiconductor laser 02 is generally large, and it is generally necessary to first collimate the beam before application, and then further homogenize or otherwise optically treat it as required by the particular application for the light source.
As shown in fig. 1, the beam shaping module 01 according to the embodiment of the present invention first couples a laser beam emitted from a laser 02 into a slab optical waveguide 11, where the originally emitted laser beam is subjected to optical processing such as homogenization in the slab optical waveguide 11, and can also effectively reduce energy loss at the edge of an emitted shaped light spot, and the effect of reducing energy loss at the edge of the light spot is more obvious.
The laser beam homogenized by the flat optical waveguide 11 enters the light shaping unit 20 for collimation and shaping. On the basis of obtaining the same shaping effect, the light beam homogenization effect of the emergent laser beam is better, and after the energy loss is reduced, the uniformity of the emergent laser beam is improved, and meanwhile, the brightness of light spots is also improved.
First, in the beam shaping module 01 according to the embodiment of the present invention, the generation method of the laser beam is not particularly limited, and for example, the devices that generate the laser beam, which are common in the prior art, are classified into a gas laser, a solid laser, a semiconductor laser, and a dye laser 4 according to the working medium. Or, other devices capable of generating laser light according to the conditions may be included, and this is not particularly limited in the embodiment of the present invention as long as the laser beam emitted by the laser 02 is incident on the flat optical waveguide 11. However, it should be understood that the laser beam incident on the flat optical waveguide 11 in the embodiment of the present invention should be the original laser beam directly emitted from the laser 02, and should not include the laser beam that is excited and then transmitted through an optical fiber or other transmission process. In the following description, a laser beam emitted from a semiconductor laser is taken as an example for detailed description.
Secondly, in the beam shaping module 01 according to the embodiment of the present invention, the slab optical waveguide 11 and the shaping optical unit 20 are sequentially arranged along the direction of the optical path, that is, according to the emitting direction of the laser beam emitted from the semiconductor laser, according to the arrangement mode of the beam shaping module 01, the laser beam should first pass through the slab optical waveguide 11, and then exit from the light emitting surface of the slab optical waveguide 11 and then enter the shaping optical unit 20.
Thirdly, the composition of the shaping optical unit 20 in the beam shaping module 01 according to the embodiment of the present invention is not specifically limited, the shaping optical unit 20 is configured to collimate and shape the incident laser beam, for example, optical devices such as a collimating lens and a fiber collimator can achieve collimation and shaping of the laser beam, in addition, other optical devices capable of collimating and emitting the laser beam may be included in the shaping optical unit 20 according to the present invention, and those skilled in the art can select and set the optical devices according to needs, and the embodiment of the present invention is not limited to the specific form of the shaping optical unit 20 as long as the collimation and emission of the incident laser beam can be achieved.
Further, the optical waveguide is an optical structure capable of guiding and propagating a light beam, and includes a flat (thin film) dielectric optical waveguide, a strip dielectric optical waveguide, an integrated optical waveguide, a columnar optical waveguide (optical fiber), a wedge optical waveguide, and the like. The flat optical waveguide 11 is an optical waveguide having the most basic and simple structure, and is widely used in optical devices in various fields. In the embodiment of the present invention, the slab optical waveguide 11 is used as an optical component for guiding, coupling and homogenizing light beams in the module, which is shown in fig. 1 as the slab optical waveguide 11, the slab optical waveguide 11 is generally composed of three layers of uniform media, the middle dielectric layer is called a waveguide layer or a core layer, and the dielectric layers on both sides of the core layer are called cladding layers. The dielectric constant of the core layer is slightly higher than that of the cladding layers on two sides of the core, so that light beams can be concentrated in the core layer to guide propagation, and therefore the light beams play a role of guided waves.
As shown in fig. 1, the flat optical waveguide 11 is disposed on the optical path of the laser beam emitted from the semiconductor laser, and as shown by the arrow in fig. 1, the laser beam can be coupled into the flat optical waveguide 11 through the light incident surface 111 of the flat optical waveguide for optical processing, and guided to propagate to the light emergent surface 113 of the flat optical waveguide, and then enter the light shaping unit 20 for collimation and shaping, and then be emitted.
It should be noted that the slab optical waveguide 11 is arranged according to the switching of the acting direction in the optical path, and usually acts only in a single direction of the laser beam, and is embodied to have a limiting effect on two edges where the laser beam diverges in the single direction, so as to limit the abrupt decrease of the light intensity distribution occurring in the two edges in the direction. For example, fig. 1 shows a slow axis view, in which the plate optical waveguide 11 acts only on the slow axis, so that the laser beam in the slow axis direction is limited by the guided propagation and the homogenization of the plate optical waveguide 11, while for the fast axis direction of the laser beam, the plate optical waveguide 11 can act only as a parallel plate channel for passing the laser beam without affecting the divergence angle in the fast axis direction.
For another example, as shown in fig. 3, which is a view in the fast axis direction shown in fig. 3, the thickness direction of the flat optical waveguide 11 corresponds to the slow axis direction of the laser beam, so that the thin layer of the flat optical waveguide 11 has a limiting effect on the divergence in the slow axis direction of the laser beam.
The embodiment of the invention provides a beam shaping module 01, which comprises a flat optical waveguide 11 and a shaping optical unit 20 which are sequentially arranged along the direction of an optical path, wherein a laser beam emitted by a laser 02 is coupled into the flat optical waveguide 11, the flat optical waveguide 11 acts on a single direction of the laser beam, and the laser beam is emitted in a collimation mode through the shaping optical unit 20. The laser beam directly emitted from the laser 02 has a larger original divergence angle, and in the embodiment of the present invention, the laser beam is first coupled into the flat optical waveguide 11 to perform optical processing in a single direction, and the laser beam emitted from the flat optical waveguide 11 is collimated and shaped by the shaping optical unit 20 and then emitted. Thus, the flat optical waveguide 11 directly performs optical processing on the laser beam emitted by the laser 02, so that the energy distribution at the edge of the laser beam emitted by the flat optical waveguide 11 is relatively uniform, the cliff type energy loss at the edge of the emitted shape light spot is avoided, the uniformity of the emitted shape light spot is improved, and the brightness of the shape light spot is also effectively improved.
In the embodiment of the present invention, optionally, as shown in fig. 2, the flat optical waveguide 11 has at least one reflecting surface to adjust the light outgoing direction of the laser beam passing through according to the reflecting surface. As shown in fig. 2, taking the flat optical waveguide 11 as a right-angle prism structure as an example, the right-angle prism generally has a reflecting surface, as shown in fig. 2, the plane of one of the right-angle sides of the right-angle prism is used as the light incident plane, the plane of the other right-angle side is used as the light exiting plane, the plane of the hypotenuse of the right-angle prism is used as the reflecting plane, the laser beam is incident into the flat optical waveguide 11 from the light incident plane 111 of the flat optical waveguide along the direction indicated by the arrow in fig. 2, the light path direction is changed by the reflection of the reflection surface 112 of the flat optical waveguide, and the light exits from the light exit surface 113 of the flat optical waveguide, thus, the direction of the optical path can be adjusted by the arrangement of the reflecting surface 112 of the flat optical waveguide, therefore, the length of the beam shaping module 01 in a single direction and the whole volume are reduced, and the adaptability of the beam shaping module 01 in a special application scene can be adapted.
It should be noted that, in the present embodiment, the rectangular prism is used as an example that the flat optical waveguide 11 includes at least one reflection surface, but is not limited thereto, for example, the rectangular prism has one reflection surface, and the direction of the optical path is changed by using one reflection surface of the rectangular prism, or the flat optical waveguide 11 may have another shape including a plurality of reflection surfaces, and the reflection surfaces are used for adjusting the outgoing direction of the laser beam after passing through the flat optical waveguide 11, as long as the direction of the outgoing light of the laser beam can be adjusted by the reflection surfaces. Moreover, when the flat optical waveguide 11 is a right-angle prism, the included angle between the hypotenuse and the right-angle side of the right-angle prism is not specifically limited in the embodiment of the present invention, for example, the included angle may be 45 ° isosceles right-angle prism, or may be other included angles.
In addition, fig. 2 shows the arrangement position relationship of each component in the light beam shaping module 01 according to the embodiment of the present invention along the optical path direction, and it should be understood by those skilled in the art that the schematic diagram does not limit the interval and the spacing distance between each component, and it is easy to understand that, when the light beam shaping module 01 according to the embodiment of the present invention is applied to a small optical device such as a mobile phone terminal, in order to reduce the structural size of the module as much as possible, the interval between each component should be reduced as much as possible, or adjacent components should be attached to each other.
In the embodiment of the present invention, optionally, as shown in fig. 2, the shaping light unit 20 includes a collimating lens, and the collimating lens includes a fast-axis collimating lens 21 and/or a slow-axis collimating lens 22 disposed on a light-emitting surface of the fast-axis collimating lens 21.
The fast axis collimating lens 21 and the slow axis collimating lens 22 are used for collimating and shaping the fast axis and the slow axis of the laser beam, respectively, if the collimating lens in the embodiment of the present invention includes the fast axis collimating lens 21, the light emitted from the fast axis of the laser beam can be collimated and shaped, and if the collimating lens in the embodiment of the present invention includes the slow axis collimating lens 22, the light emitted from the slow axis direction of the laser beam can be collimated and shaped, if the collimating lens in the embodiment of the present invention includes the fast axis collimating lens 21 and the slow axis collimating lens 22, and the slow axis collimating lens 22 is usually disposed on the light emitting surface of the fast axis collimating lens 21, the light can be collimated and shaped respectively for the fast axis and the slow axis of the laser beam, furthermore, it should be noted that when the shaping light unit 20 further includes the slow axis collimating lens 22 in addition to the fast axis collimating lens 21, the clear apertures of the two should be matched as much as possible. Alternatively, the collimating lens may also include other lens combination forms to perform other optical processing while performing beam collimation on the fast axis and/or the slow axis, for example, to achieve the effect of collimating and shaping the fast axis and the slow axis of the beam, and may also select a fast-slow axis integral mirror as the collimating lens.
The fast axis collimating lens 21 and the slow axis collimating lens 22 may both be cylindrical lenses, and the cross-sectional shape of the cylindrical lens may be set to a shape matched with or approximately matched with the shape of the light spot of the laser beam emitted from the light emitting surface 113 of the flat optical waveguide, for example, when the emitted shape of the light spot is circular, the cross-section of the cylindrical lens may be set to be circular, so that the effective utilization rate of the optical group structure is improved, and the waste of space and structure is avoided.
The fast axis collimating lens 21 may be a plano-convex cylindrical lens, wherein one side of the plane is used as the light incident surface of the fast axis collimating lens 21, and the other side of the convex surface is used as the light emergent surface of the fast axis collimating lens 21. The slow-axis collimating lens 22 can be selected from various collimating lens forms such as a plano-convex cylindrical lens, a biconvex cylindrical lens, a concave-convex cylindrical lens and the like. Preferably, the slow-axis collimating lens 22 is a concave-convex cylindrical lens, wherein one side of the concave surface is used as the light incident surface of the slow-axis collimating lens 22, and the other side of the convex surface is used as the light emergent surface of the slow-axis collimating lens 22. By using the concave-convex cylindrical lens as the slow-axis collimating lens 22, and using the concave surface as the light incident surface and the convex surface as the light emergent surface, the beam shaping module 01 of the embodiment of the present invention can be provided with less mention. Moreover, the size of the concave surface of the light incident surface of the slow axis collimating lens 22 can be set to be the same or approximately the same as the shape and diameter of the light spot of the laser beam collimated by the fast axis collimating lens 21, so that the light spot light beam incident on the slow axis collimating lens 22 can be ensured to be incident from the concave surface.
Similarly, the light-emitting surface 113 of the slab optical waveguide 11 and the light-exiting surface 113 of the slab optical waveguide located at the front side of the optical path of the shaping optical unit 20 should also match the clear aperture of the shaping optical unit 20 behind the light-exiting surface, that is, the height of the slab optical waveguide 11 matches the clear aperture of the fast-axis collimating lens 21 and/or the slow-axis collimating lens 22.
In another aspect of the embodiments of the present invention, as shown in fig. 4, an optical device is provided, which includes the beam shaping module 01 of any one of the foregoing, and further includes a laser 02, where the laser 02 is disposed on the light incident surface of the beam shaping module 01, that is, in the beam shaping module 01, a laser beam emitted by stimulated radiation of the laser 02 is subjected to homogenization treatment and collimation shaping.
As already explained in the foregoing description of the working process of the beam shaping module 01, the device for generating laser beams by stimulated radiation may be the laser 02, the laser 02 generates laser beams by stimulated radiation, and for example, a semiconductor laser is taken as an example, because the collimation of the laser beams emitted by the semiconductor laser is poor, the beam shaping module 01 is disposed on the light emitting surface of the semiconductor laser, and the light incident surface of the beam shaping module 01 corresponds to the optical path direction of the semiconductor laser, so that the laser beams emitted by the semiconductor laser can be directly subjected to beam quality processing such as homogenization and collimation in the beam shaping module 01 to be emitted as laser beams with better quality.
The optical device provided by the embodiment of the invention adopts the beam shaping module 01 and further comprises a laser 02, and the laser 02 is arranged on the light incident surface of the beam shaping module 01. The laser beam emitted by the laser 02 enters the beam shaping module 01 from the light incident surface of the beam shaping module 01, the beam shaping module 01 comprises a flat optical waveguide 11 and a shaping optical unit 20 which are sequentially arranged along the light path direction, the laser beam is firstly coupled into the flat optical waveguide 11 for homogenization treatment, then is shaped by the shaping optical unit 20 and then is emitted, and the light energy at the edge of a shape light spot of the laser beam emitted by the laser 02 is homogenized through the treatment of the beam shaping module 01, so that the cliff type energy loss at the edge of the light spot is avoided, the uniformity of the emitted shape light spot is improved, and the brightness of the shape light spot is effectively improved.
In the embodiment of the present invention, optionally, as shown in fig. 4, the light emitting surface of the laser 02 is attached to the light incident surface 111 of the slab optical waveguide in the beam shaping module 01.
As shown in fig. 4, the light-emitting surface of the laser 02 is attached to the light-incident surface 111 of the slab waveguide in the beam shaping module 01, so that the laser beam emitted from the laser 02 can be coupled into the slab waveguide 11 in the beam shaping module 01 more completely, on one hand, the possible light energy loss at the coupling position is avoided as much as possible, and on the other hand, the light-emitting surface of the laser 02 is closely attached to the light-incident surface 111 of the slab waveguide in the beam shaping module 01, so that the structure of the optical device is compact as much as possible.
In this embodiment of the present invention, optionally, as shown in fig. 5, the slab optical waveguide 11 in the beam shaping module 01 has at least one reflection surface, the light emitting surface of the laser 02 is attached to the light incident surface 111 of the slab optical waveguide, and the laser beam is incident from the light incident surface 111 of the slab optical waveguide, reflected by the reflection surface 112 of the slab optical waveguide, and emitted from the light emitting surface 113 of the slab optical waveguide.
The flat optical waveguide 11 has at least one reflecting surface, and the laser beam incident to the flat optical waveguide 11 is reflected and turned by one reflecting surface or turned for multiple times by a plurality of reflecting surfaces in sequence, so that the light outgoing direction of the laser beam passing through the flat optical waveguide 11 can be adjusted according to the setting number, the setting position, the included angle and the like of the reflecting surfaces, and the optical device provided by the embodiment of the invention can be suitable for the structural and functional requirements of various optical instruments.
It should be noted that, as shown in fig. 6, in order to obtain a better transmission effect, on the premise that the length (e.g., the Z direction in fig. 6) of the slab optical waveguide 11 does not exceed the distance from the light emitting side of the laser 02 to the light incident surface of the fast axis collimating lens 21, the light emitting surface of the laser 02 should be attached to the light incident surface 111 of the slab optical waveguide as much as possible, and the light emitting surface 113 of the slab optical waveguide should be attached to the light incident surface of the fast axis collimating lens 21 as much as possible, so that the length of the slab optical waveguide 11 is lengthened as much as possible.
In an embodiment of the present invention, optionally, as shown in fig. 5, the flat optical waveguide 11 in the beam shaping module 01 is a right-angle prism, two right-angle sides of the right-angle prism are a light incident surface and a light emitting surface respectively, and a bevel edge is a reflection surface, and the light emitting surface of the laser 02 is attached to the light incident surface of the right-angle prism.
As shown in fig. 5, the planar optical waveguide 11 is a right-angle prism structure, a plane where a right-angle side of the right-angle prism is located is used as a light incident plane, a plane where another right-angle side is located is used as a light emitting plane, a plane where a hypotenuse of the right-angle prism is located is used as a reflecting plane, a light emitting plane of the laser 02 is tightly attached to the light incident plane of the right-angle prism to emit laser beams, the directions of the light paths of the laser beams are changed after the laser beams are reflected by the reflecting plane of the right-angle prism along the directions shown by arrows, as shown in fig. 5, the light paths are emitted in an upward direction and then are changed into the directions of the light incident planes of the right-side fast-axis collimating lens 21.
In the optical device of the embodiment of the invention, the flat optical waveguide 11 adopts the right-angle prism, so that the length size of the optical device in one direction and the volume of the whole optical device are reduced, and the optical path direction of the optical device of the embodiment of the invention can be adjusted by selecting the prisms with different shapes and angles, so that the optical device can be suitable for various special application scenes.
Optionally, the laser 02 is a semiconductor laser.
Optionally, the laser 02 comprises at least one light emitting point.
In the optical device according to the embodiment of the present invention, the laser 02 includes at least one light emitting point, that is, the laser 02 may include only one light emitting point, and the laser beam emitted from the light emitting point directly enters the beam shaping module 01, or the laser 02 may include a plurality of light emitting points, and the plurality of light emitting points emit laser beams at the same time, so as to be applied to special fields and devices requiring multi-point light emission.
Alternatively, the laser 02 includes a plurality of light emitting points, and the thickness direction of the flat optical waveguide 11 corresponds to a direction perpendicular to the arrangement direction of the plurality of light emitting points.
For example, a plurality of light emitting points may be uniformly distributed in the fast axis direction of the laser 02, and the thickness direction of the slab optical waveguide 11 is perpendicular to the arrangement direction of the light emitting points, that is, the thickness direction of the slab optical waveguide 11 is along the slow axis direction of the laser 02. Conversely, a plurality of light emitting points may be uniformly distributed along the slow axis direction of the laser 02, and the thickness direction of the slab optical waveguide 11 is the fast axis direction of the laser 02. As shown in fig. 3, taking an example that a plurality of light emitting points are uniformly distributed along the fast axis direction of the laser 02, each light emitting point is excited to emit a laser beam with a shape of light spot, by arranging the beam shaping module 01 comprising the flat optical waveguide 11 and the shaping optical unit 20 in the fast axis direction, the thickness direction of the flat optical waveguide 11 is perpendicular to the fast axis direction, so that the plurality of laser beams emitted along the fast axis direction can be simultaneously guided, coupled, homogenized and collimated, and the beam shaping module 01 is arranged in a manner shown in the fast axis view of fig. 3.
Alternatively, as shown in fig. 6, a plurality of light emitting points are arranged uniformly in the fast axis direction of the laser 02, and the thickness direction of the flat optical waveguide 11 corresponds to the slow axis direction of the laser 02.
A laser chip of a nanostack structure is exemplified as a laser source. As shown in fig. 6, the plurality of light emitting points are uniformly arranged along the fast axis direction, the thickness direction (e.g., X direction in fig. 6) of the flat optical waveguide 11 corresponds to the slow axis direction of the laser 02, preferably, as shown in fig. 4, the thickness of the flat optical waveguide 11 is consistent with the width of the laser 02, so that the laser beam can be completely incident into the flat optical waveguide 11, the height direction (e.g., Y direction in fig. 6) of the flat optical waveguide 11 extends along the fast axis direction of the laser 02, and thus, the flat optical waveguide 11 only acts on the slow axis direction of the laser beam, so that the laser beam passing through the flat optical waveguide 11 is limited, the divergence of the laser beam in the slow axis direction is limited, and the laser beam exiting after passing through the flat optical waveguide 11 is in the far field light intensity flat distribution of the slow axis, the energy distribution at both edges of the flat is uniform, and the, the light passing of the laser beam in the direction of the fast axis is not influenced, and the divergence angle of the fast axis is not influenced.
Alternatively, the laser 02 may also be a laser bar, and a plurality of light-emitting points are uniformly distributed on the laser bar along the slow axis direction.
In contrast to the laser chip with a nanostack structure, the thickness direction of the slab optical waveguide 11 corresponds to the fast axis direction of the laser bars, and the height direction of the slab optical waveguide 11 extends along the slow axis direction of the laser bars, so that the slab optical waveguide 11 homogenizes and collimates the laser beam emitted along the fast axis direction, and the divergence of the laser beam in the fast axis direction is limited.
Alternatively, as shown in fig. 6, the laser 02 is a laser chip, and a heat sink structure 03 is bonded to the laser chip.
The laser 02 may be a laser chip, such as the aforementioned nanostack (nano stack) structure laser chip, and the laser chip may be a single light emitting point laser chip or a multiple light emitting point laser chip as required. However, the laser chip has a small volume and a relatively concentrated range of excited light, and is easy to accumulate certain heat during the operation of the excited light, so that a heat sink structure 03 is bonded on the laser chip to improve and enhance the heat dissipation performance of the laser chip.
In addition, the specific material and structural form of the heat sink structure 03 in the embodiment of the present invention are not particularly limited, as long as the temperature rise of the laser chip can be limited and improved to provide effective heat dissipation for the laser chip.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A beam shaping module is characterized by comprising a flat optical waveguide and a shaping optical unit which are sequentially arranged along the direction of an optical path, wherein a laser beam emitted by a laser is coupled into the flat optical waveguide, the flat optical waveguide acts on a single direction of the laser beam, and the laser beam is emitted through the shaping optical unit.
2. The beam-shaping module as claimed in claim 1, wherein the slab optical waveguide has at least one reflecting surface for adjusting the light-emitting direction of the laser beam passing therethrough according to the reflecting surface.
3. The beam-shaping module as claimed in claim 1, wherein the shaping light unit comprises a collimating lens, and the collimating lens comprises a fast axis collimating lens and/or a slow axis collimating lens disposed at a light-emitting surface of the fast axis collimating lens.
4. An optical device comprising the beam shaping module of any one of claims 1-3, and further comprising a laser disposed at the input face of the beam shaping module.
5. The optical device according to claim 4, wherein the light-emitting surface of the laser is attached to the light-incident surface of the slab waveguide in the beam shaping module.
6. The optical device according to claim 5, wherein the light exiting surface of the slab optical waveguide is attached to the light entering surface of the light shaping unit.
7. The optical device according to claim 4, wherein the slab optical waveguide in the beam shaping module is a right-angle prism, two right-angle sides of the right-angle prism are a light incident surface and a light emitting surface respectively, and the bevel edge is a reflection surface, and the light emitting surface of the laser is attached to the light incident surface of the right-angle prism.
8. The optical device of claim 4, wherein the laser comprises at least one light emitting point.
9. The optical device according to claim 8, wherein the laser includes a plurality of light emitting points, and a thickness direction of the flat optical waveguide corresponds to a direction perpendicular to an arrangement direction of the plurality of light emitting points.
10. The optical device according to claim 9, wherein the plurality of light emitting points are arranged uniformly in a direction of a fast axis of the laser, and a thickness direction of the slab optical waveguide corresponds to a direction of a slow axis of the laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332884.XA CN110994353A (en) | 2019-12-20 | 2019-12-20 | A beam shaping module and optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332884.XA CN110994353A (en) | 2019-12-20 | 2019-12-20 | A beam shaping module and optical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110994353A true CN110994353A (en) | 2020-04-10 |
Family
ID=70073881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911332884.XA Pending CN110994353A (en) | 2019-12-20 | 2019-12-20 | A beam shaping module and optical device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110994353A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111768711A (en) * | 2020-07-23 | 2020-10-13 | 维沃移动通信有限公司 | Display components and display devices |
| EP4187437A4 (en) * | 2020-07-23 | 2024-01-24 | Vivo Mobile Communication Co., Ltd. | DISPLAY ASSEMBLY AND DISPLAY DEVICE |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028722A (en) * | 1996-03-08 | 2000-02-22 | Sdl, Inc. | Optical beam reconfiguring device and optical handling system for device utilization |
| CN1752797A (en) * | 2005-10-27 | 2006-03-29 | 中国科学院上海光学精密机械研究所 | Device for improving uniformity of laser beam |
| EP1712940A1 (en) * | 2005-04-14 | 2006-10-18 | Institut Franco-Allemand de Recherches de Saint-Louis | Uniform illumination apparatus comprising a matrix of laser diodes |
| CN103345013A (en) * | 2013-07-16 | 2013-10-09 | 西安电子科技大学 | Special-shaped prism and semiconductor laser array flat-topped beam shaper |
| CN105092216A (en) * | 2015-08-29 | 2015-11-25 | 中国科学院光电研究院 | Laser diode area array pumped uniformity detection apparatus |
| CN211295690U (en) * | 2019-12-20 | 2020-08-18 | 西安炬光科技股份有限公司 | A beam shaping module and optical device |
-
2019
- 2019-12-20 CN CN201911332884.XA patent/CN110994353A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028722A (en) * | 1996-03-08 | 2000-02-22 | Sdl, Inc. | Optical beam reconfiguring device and optical handling system for device utilization |
| EP1712940A1 (en) * | 2005-04-14 | 2006-10-18 | Institut Franco-Allemand de Recherches de Saint-Louis | Uniform illumination apparatus comprising a matrix of laser diodes |
| CN1752797A (en) * | 2005-10-27 | 2006-03-29 | 中国科学院上海光学精密机械研究所 | Device for improving uniformity of laser beam |
| CN103345013A (en) * | 2013-07-16 | 2013-10-09 | 西安电子科技大学 | Special-shaped prism and semiconductor laser array flat-topped beam shaper |
| CN105092216A (en) * | 2015-08-29 | 2015-11-25 | 中国科学院光电研究院 | Laser diode area array pumped uniformity detection apparatus |
| CN211295690U (en) * | 2019-12-20 | 2020-08-18 | 西安炬光科技股份有限公司 | A beam shaping module and optical device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111768711A (en) * | 2020-07-23 | 2020-10-13 | 维沃移动通信有限公司 | Display components and display devices |
| EP4187437A4 (en) * | 2020-07-23 | 2024-01-24 | Vivo Mobile Communication Co., Ltd. | DISPLAY ASSEMBLY AND DISPLAY DEVICE |
| EP4187436A4 (en) * | 2020-07-23 | 2024-01-24 | Vivo Mobile Communication Co., Ltd. | Display assembly and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10310278B2 (en) | Semiconductor laser | |
| CN103941406B (en) | High-power semiconductor laser optical shaping method and device based on beam expanding | |
| KR101696055B1 (en) | Multiple beam combiner for laser processing apparatus and a radiation source | |
| CN204575981U (en) | Laser Multiplexing apparatus and projector equipment | |
| KR101738155B1 (en) | Device for forming line beam | |
| CN107121781B (en) | Beam shaping device | |
| CN201199288Y (en) | Right Angle Prism Group Realizes Beam Coupling Device of High Power Semiconductor Laser Array | |
| CN205790934U (en) | A kind of semiconductor laser | |
| WO2024098826A1 (en) | Optical shaping module and device and lidar system | |
| Lin et al. | Beam-shaping technique for fiber-coupled diode laser system by homogenizing the beam quality of two laser diode stacks | |
| CN110994353A (en) | A beam shaping module and optical device | |
| CN103199439A (en) | Semiconductor laser device | |
| CN102004320A (en) | High-power semiconductor laser array fast and slow axis beam quality homogenization device | |
| CN211295690U (en) | A beam shaping module and optical device | |
| US20200018979A1 (en) | Device for collimating a light beam, high-power laser, and focusing optical unit and method for collimating a light beam | |
| CN107450191A (en) | An Optical System for Dispersing Speckle Laser Backlight TV | |
| CN101672948B (en) | Light guide plate and backlight module with same | |
| WO2025001788A1 (en) | Laser module and medical apparatus | |
| CN103293694A (en) | Multiple semiconductor laser beam combining system | |
| CN107703636A (en) | The laser dodging device of antireflection | |
| CN214899327U (en) | A multi-tube semiconductor laser | |
| CN207557536U (en) | A kind of red-light source module | |
| CN215219331U (en) | Annular light spot laser | |
| CN116780344A (en) | Laser module and medical device | |
| CN207114901U (en) | Light-beam forming unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |