TW202122855A - Bessel beam homogenization module - Google Patents

Abstract

A Bessel beam homogenization module, adapted to receive a Gaussian beam, includes an axicon lens, an optical element and a partitioned condenser element. The optical element has a focal length. The partitioned condenser element includes a plurality of quadrant regions and is located between the axicon lens and the optical element. The Gaussian beam sequentially passes through the axicon lens, the partitioned condenser element and the optical element to form a Bessel beam at a focal point of the optical element.

Description

Besso beam homogenization module

The present invention relates to an optical module, and particularly relates to a Besso beam homogenizing module.

With the development of smart vehicles, Internet of Things, and artificial intelligence (AI), the demand for sensing and detection devices is increasing rapidly, and sensing devices are developing in the direction of high strength, miniaturization and resistance to environmental changes, so composite materials The demand for cutting and welding of materials such as glass and ceramics is gradually increasing.

Ultra-fast laser micro-cutting technology can be used for precision cutting of hard and brittle substrates and multilayer composite materials. The Gaussian beam is shaped into a Bessel beam to reduce chipping and improve cutting. The flatness of the cutting wall. In addition, the ultra-fast laser micro-welding technology can achieve precision/high air-tight packaging. Through Besso beam welding, the air layer thickness of the two welding materials can be overcome, and welding failures caused by slight warpage or deformation of the materials can be avoided.

However, the longitudinal light intensity of the Besso beam emitted by the traditional Besso beam module is strong at the front and weak at the back. Therefore, when cutting, the uniformity of the cutting wall surface will be inconsistent. On the other hand, the traditional Bezo light beams are all of a single length. To cut materials of different thicknesses, it is necessary to overcome the welding of different air layer gaps, and it is necessary to use Bezo optical modules of different lengths for replacement cutting. Complicated procedures will cause low production efficiency.

The present disclosure provides a Besso beam homogenization module, so that the Besso beam has high longitudinal light uniformity.

An embodiment of the present disclosure provides a Bezos beam homogenization module, which is suitable for receiving a Gaussian beam, and includes a conical lens, an optical element, and a zonal converging element. The optical element has a focal length. The partition converging element includes a plurality of quadrant partitions and is located between the conical mirror and the optical element. The Gaussian beam sequentially passes through the conical lens, the partition converging element and the optical element to form a Bessel beam at the focal point of the optical element.

Based on the above, in the Besso beam homogenization module of the present disclosure, since the partition converging element with multiple quadrant divisions is used, the Besso beam formed by the Besso beam homogenization module can have high longitudinal light uniformity.

In order to make the above-mentioned features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

The embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings. The embodiments of the present disclosure can also be presented in many different forms, and should not be understood as being limited to the embodiments listed herein. To be precise, these embodiments are provided to make the disclosed content more thorough and complete, and to fully convey the concept of each embodiment to those with ordinary knowledge in the technical field.

This article describes various embodiments of the present disclosure with reference to various drawings. These drawings are schematic diagrams of idealized implementation schemes (and intermediate structures) of various embodiments. As a result, changes in the shape of the schema caused by, for example, manufacturing technology and/or tolerances should be expected. Therefore, the embodiments of the present disclosure should not be construed as being limited to the specific shapes of the regions described herein, but should include shape deviations caused by, for example, manufacturing. Therefore, each area shown in the figure is essentially a schematic diagram, and its shape is not intended to depict the actual shape of the area of the device, nor is it intended to limit the scope of each embodiment.

Unless otherwise specified, the meanings of all terms (including technical and scientific terms) used herein are the same as those commonly understood by those with ordinary knowledge in the technical field to which the embodiments of the present disclosure belong. It is easier to understand that those terms such as those defined in the general dictionary should be understood as having the same meaning as those in the prior art, and should not be understood as ideal or too formal, unless there is a clear stipulation in this article.

The following is an example for description, but the present disclosure is not limited to the multiple examples. In addition, the cited embodiments may be combined with each other to form another embodiment. FIG. 1 is a schematic diagram of a laser optical system according to an embodiment of the disclosure, FIG. 2 is a schematic side view of the internal optical structure of the Besso beam homogenization module of FIG. 1, and FIG. 3A is a schematic diagram of the partition converging element of FIG. Top view schematic.

1, the laser optical system 100 of this embodiment includes a laser light source 110, a controller 120, a beam expander 130, a reflection structure 140, a Besso beam homogenization module 150, and a first The mobile platform 160, a clamping base 170 and a second mobile platform 180. The laser light source 110, the first mobile platform 160, and the second mobile platform 180 are electrically connected to the controller 120, respectively. In this embodiment, the laser light source 110 is adapted to generate a Gaussian beam LG (Gaussian beam), which is input to the beam expander 130 to be expanded by the beam expander 130 and transmitted to the reflective structure 140, and then through the reflective structure 140 is reflected into the Bessel beam homogenization module 150 to adjust the Gaussian beam LG into a homogenized Bessel beam BB. Then, the Besso beam emitted by the Besso beam homogenization module 150 can perform ultra-fast laser micro-processing such as micro-welding or micro-cutting on the object S clamped in the clamping base 170. In this embodiment, the second mobile platform 180 is, for example, a two-axis mobile platform. The clamping base 170 is disposed on the second mobile platform 180. The second mobile platform 180 can be controlled by the controller 120 in X Move in the direction of the axis and Y axis respectively. Accordingly, the Bezos beam BB emitted by the Bezos beam homogenization module 150 can perform micro-processing on the object S clamped in the clamping base 170 at different positions on the X-Y plane. In addition, in this embodiment, the first mobile platform 160 is, for example, a single-axis mobile platform, the Besso beam homogenization module 150 is disposed on the first mobile platform 160, and the first mobile platform 160 is controlled by the controller 120 It can be controlled to move in the Z-axis direction. In this way, the distance between the Bessel beam homogenization module 150 and the object S clamped in the clamping base 170 can be adjusted correspondingly. However, in other embodiments, according to different arrangements and configurations, the first mobile platform 160 can also move in the direction of the X axis or the Y axis, and the second mobile platform 180 can also move in the direction of the Y axis and the Y axis. Moving in the Z-axis direction or in the X-axis and Z-axis directions, the present disclosure is not limited to this. In addition, the moving directions of the first mobile platform 160 and the second mobile platform 180 may not be limited to single-axis, dual-axis, or more than three-axis, and mobile platforms of different specifications can be configured according to actual operation requirements, and are not limited thereto.

，且透鏡元件153與錐狀鏡151以及分區匯聚元件152同光軸O。在此配置下，高斯光束LG依序經由錐狀鏡151、分區匯聚元件152以及透鏡元件153的整型、聚焦與均質化，以產生均質化的貝索光束BB。詳細來說，貝索光束均質模組150藉由錐狀鏡151及分區匯聚元件152的搭配，將所接收到的高斯光束LG整形成貝索光束BB，再經由分區匯聚元件152與透鏡元件153的搭配，將貝索光束BB均質化，以在於透鏡元件153的聚焦處形成具備高縱向光均勻度的（非衍射）貝索光束BB。Please refer to 1 again and in conjunction with FIG. 2, the Besso beam homogenization module 150 includes an axicon lens 151, a partition converging element 152, and an optical element to provide an equivalent focal length. In this embodiment, the partition convergent element 152 is, for example, a quadrant lens structure, and the optical element is a lens element 153 (for example, a convex lens, a plano-convex lens, or a double-convex lens). However, in other embodiments, the above-mentioned optical element is also a zonal converging element, as shown in FIGS. 4A and 4B. In this embodiment, the partition convergent element 152 is divided into 2n quadrants, and n≧2. That is, the partition converging element 152 includes multiple quadrant partitions, where the number of quadrant partitions is 2n, and n≧2. The focal length of each quadrant division may be different, and the focal points of all quadrant divisions have the same optical axis O as the axis of the division converging element 152. The partition converging element 152 is located between the conical mirror 151 and the lens element 153. The lens element 153 has a focal length

, And the lens element 153, the conical lens 151 and the partition converging element 152 are on the same optical axis O. In this configuration, the Gaussian beam LG is sequentially shaped, focused, and homogenized by the conical lens 151, the partition converging element 152, and the lens element 153 to generate a homogenized Bezos beam BB. In detail, the Bezos beam homogenization module 150 uses the conical lens 151 and the partition converging element 152 to shape the received Gaussian beam LG into the Bezos beam BB, and then passes through the partition converging element 152 and the lens element 153. With the combination of, the Besso beam BB is homogenized, so that the (non-diffracting) Besso beam BB with high longitudinal light uniformity is formed at the focal point of the lens element 153.

，且位於對角上的兩個象限分區P1〜P4的焦距

需相等，以產生對角干涉。舉例而言，本實施例中的象限分區P1〜P4分別具有焦距

〜

，其中象限分區P1的焦距

與其所相鄰的象限分區P2的焦距

以及所相鄰的象限分區P4的焦距

皆不同，而象限分區P1的焦距

與位於其對角上的象限分區P3的焦距

為相等。藉由上述配置，經由分區匯聚元件152的貝索光束BB可被均質化，使得貝索光束BB在兩兩相對應的象限分區的焦點處再疊合，並在透鏡元件153的聚焦處形成具備高縱向光均勻度的貝索光束BB。Please refer to 3A. The partition convergent element 152 includes, for example, 2n quadrant partitions, where n≧2, the shape of each quadrant partition is a sector, and the apex angle of the sector is (180/n) degrees. Specifically, in this embodiment, the partition converging element 152 includes 4 quadrant partitions P1~P4 (ie n=2), and the shape of each quadrant partition P1~P4 is a sector, and the apex angle of the sector is 90 degrees. . Among them, any two adjacent quadrant partitions P1~P4 have different focal lengths

, And the focal lengths of the two quadrant divisions P1~P4 located on the diagonal

Need to be equal to produce diagonal interference. For example, the quadrant partitions P1~P4 in this embodiment respectively have focal lengths

~

, Where the focal length of the quadrant P1

The focal length of the adjacent quadrant P2

And the focal length of the adjacent quadrant P4

Are different, and the focal length of quadrant P1

Focal length from the quadrant partition P3 located on the opposite corner

Is equal. With the above configuration, the Bezos light beam BB passing through the partition converging element 152 can be homogenized, so that the Bezos light beam BB re-superimposes at the focal point of the two corresponding quadrant partitions, and forms the focal point of the lens element 153. Besso beam BB with high longitudinal light uniformity.

、

以及

，其中

為貝索光束BB的圓錐形半角，

為錐狀鏡151的材料折射率，

為真空折射率，

為錐狀鏡151的頂角，

為無衍射範圍，

為入射高斯光束LG的束腰（beam waist），且

，其中

為象限分區P1〜P4的最大設計焦距，而

為象限分區P1〜P4的最小設計焦距，

為分區匯聚元件152中各象限分區P1〜P4的焦距，

為透鏡元件153的焦距。貝索光束均質模組150所形成的貝索光束BB的實際長度，可由對應各象限分區P1～P4中的焦距

所計算出最大的長度Z來決定。舉例而言，分區匯聚元件152象限分區P1〜P4的焦距

（包含

〜

）可介於-1000 mm〜1000 mm之間，而當象限分區P1的焦距

以及象限分區P3的焦距

例如是為72 mm時，則分別與象限分區P1及P3相鄰的象限分區P2的焦距

以及象限分區P4的焦距

可介於

或

之間，例如是7.2 mm～144 mm之間。經實驗的驗證，藉由上述配置關係，可使得焦點處的貝索光束BB的光強度分佈均勻，使得貝索光束BB的縱向光均勻度大於90%，且計算後的貝索光束BB的長度Z可介於

〜

之間。To further explain, the calculation of the length Z (ie, Depth of field) of the Bezos beam BB formed by the Bezos beam homogenization module 150 can be based on the following formula:

,

as well as

,among them

Is the cone-shaped half-angle of the Besso beam BB,

Is the refractive index of the conical mirror 151,

Is the vacuum refractive index,

Is the vertex angle of the conical mirror 151,

Is the non-diffraction range,

Is the beam waist of the incident Gaussian beam LG, and

,among them

Is the maximum design focal length of the quadrant P1~P4, and

Is the minimum design focal length of the quadrant P1~P4,

Is the focal length of each quadrant partition P1~P4 in the partition converging element 152,

Is the focal length of the lens element 153. The actual length of the Besso beam BB formed by the Besso beam homogenization module 150 can be determined by the focal length corresponding to each quadrant zone P1～P4

The calculated maximum length Z is determined. For example, the focal lengths of the 152 quadrants P1~P4 of the partition converging element

(contain

~

) Can be between -1000 mm~1000 mm, and when the focal length of the quadrant P1

And the focal length of quadrant P3

For example, when it is 72 mm, the focal length of the quadrant P2 adjacent to the quadrant P1 and P3

And the focal length of quadrant P4

Can be between

or

The distance is between 7.2 mm and 144 mm, for example. It has been verified by experiments that through the above configuration relationship, the light intensity distribution of the Besso beam BB at the focal point can be made uniform, so that the longitudinal light uniformity of the Besso beam BB is greater than 90%, and the calculated length of the Besso beam BB Z can be between

~

between.

，且位於對角上的兩象限分區P1a〜P8a的焦距

需相等。具體而言，在此實施例中的象限分區P1a〜P8a分別具有焦距

〜

，其中象限分區P1a的焦距

與其所相鄰的象限分區P2a的焦距

及象限分區P8a的焦距

皆不同，而象限分區P1a的焦距

與位於其對角上的象限分區P5a的焦距

為相等；同樣地，象限分區P2a的焦距

與其所相鄰的象限分區P1a的焦距

以及所相鄰的象限分區P3a的焦距

皆不同，而象限分區P2a的焦距

與位於其對角上的象限分區P6a的焦距

為相等；並以此類推，象限分區P3a〜P8a的焦距

〜

亦符合上述規律。因此，經由分區匯聚元件152a的貝索光束BB可被均質化，使得線形光束BB在四組兩相對應的象限分區的焦點處再疊合，並在透鏡元件153的聚焦處形成具備高縱向光均勻度的貝索光束BB。In another embodiment, as shown in FIG. 3B, the partition converging element 152 can be replaced with a partition converging element 152a, which for example includes 8 quadrants (ie n=4) partitions P1a~P8a, wherein each quadrant is partitioned P1a~ The shape of P8a is also a fan shape, and the apex angle of the fan shape is 45 degrees. Similarly, any two adjacent quadrant partitions P1a~P8a have different focal lengths

, And the focal length of the two-quadrant divisions P1a~P8a on the diagonal

Need to be equal. Specifically, the quadrant divisions P1a~P8a in this embodiment have focal lengths

~

, Where the focal length of the quadrant P1a

The focal length of the adjacent quadrant P2a

And the focal length of the quadrant P8a

Are different, and the focal length of the quadrant P1a

Focal length from the quadrant P5a located on the opposite corner

Are equal; similarly, the focal length of the quadrant P2a

The focal length of the adjacent quadrant P1a

And the focal length of the adjacent quadrant P3a

Are different, and the focal length of the quadrant P2a

Focal length from the quadrant P6a located on the opposite corner

Are equal; and so on, the focal length of the quadrant P3a~P8a

~

It also conforms to the above-mentioned law. Therefore, the Bezos light beam BB passing through the partition converging element 152a can be homogenized, so that the linear light beam BB re-superimposes at the focal point of the four groups of two corresponding quadrant partitions, and forms a high longitudinal light beam at the focal point of the lens element 153. The uniformity of Besso beam BB.

（包含

〜

）可介於-1000 mm〜1000 mm之間，而當象限分區P1a的焦距

以及象限分區P5a的焦距

例如是為72 mm時，則象限分區P2a〜P4a及P6a〜P8a的焦距

〜

及

〜

可分別介於

或

之間，例如是7.2 mm～144 mm之間。如此一來，可使得焦點處的貝索光束BB的光強度分佈均勻，更進一步地提升貝索光束BB的縱向光均勻度，且計算後的貝索光束BB的長度Z可介於

〜

之間。The calculation method of the length Z of the Bezos beam BB formed in this embodiment is the same as that in the foregoing embodiment. For example, the focal length of the quadrant P1a~P8a

(contain

~

) Can be between -1000 mm~1000 mm, and when the focal length of the quadrant P1a

And the focal length of the quadrant P5a

For example, when it is 72 mm, the focal lengths of the quadrant divisions P2a~P4a and P6a~P8a

~

and

~

Can be between

or

The distance is between 7.2 mm and 144 mm, for example. In this way, the light intensity distribution of the Besso beam BB at the focal point can be made uniform, and the longitudinal light uniformity of the Besso beam BB can be further improved, and the calculated length Z of the Besso beam BB can be between

~

between.

However, the present disclosure is not limited to the embodiment shown in FIG. 2 in combination with FIG. 3A or FIG. 3B. As mentioned above, the Besso beam homogenization module 150 in the present disclosure may also, for example, use a dual-zone converging element to make the shell The cable beam BB is homogenized. 4A is a schematic diagram of a dual-zone convergent element according to an embodiment of the present invention, and FIG. 4B is a schematic diagram of a dual-zone convergent element according to another embodiment of the present disclosure. In the embodiment of FIG. 4A, the lens element 153 can be replaced by another partition converging element 156, which has the same structure as the partition converging element 152, so for example, it also includes 4 quadrant partitions P1~P4, and has the same Diagonal sectors have the same focal length, and adjacent sectors have different focal lengths. However, the arrangement of the partition converging element 152 and the partition converging element 156 on the quadrant partitions P1 to P4 is slightly different. Specifically, the quadrant zone P1 of the zone converging element 152 corresponds to one of the quadrant zones P2 to P4 of the zone converging element 156 in the direction of the optical axis O, that is, the first quadrant zone P1 of the zone converging element 152 corresponds to the zone One of the 2nd to 4th (ie, 2n) quadrant partitions of the converging element 156 corresponds to the optical axis O direction. In detail, the sectoral positions of the quadrant divisions P1 to P4 of the partition converging element 152 and the sector converging element 156 correspond to each other, but the focal lengths of the quadrants P1 to P4 of the partition converging element 152 and the corresponding sectoral positions converge The focal lengths of the quadrant divisions P1 to P4 of the element 156 may be the same or different. For example, referring to FIG. 4A, the quadrant partition P1 of the partition converging element 152 and the quadrant partition P4 of the partition converging element 156 have a corresponding positional relationship in the optical axis O direction, and the quadrant partition P2 of the partition converging element 152 and the partition The quadrant section P1 of the converging element 156 has a corresponding positional relationship in the direction of the optical axis O, and so on.

In addition, in the embodiment of FIG. 4B, the partition converging elements 152 and 156 can also be replaced with partition converging elements 152a and 156a including 8 quadrant partitions P1a~P8a, wherein the partition converging elements 152a and 156a are similar to the implementation of FIG. 3B The partition convergent element 152a shown in the example has the same structure and characteristics, so it will not be repeated here. Similarly, one of the first quadrant partition (for example, quadrant partition P1a) of the partition converging element 152a and the second to 8 (ie 2n) quadrant partitions (for example, quadrant partitions P2a to P8a) of the partition converging element 156a is in the light Correspond to the axis O direction. For example, referring to FIG. 4B, the quadrant partition P1a of the partition converging element 152a and the quadrant partition P8a of the partition converging element 156a have a corresponding positional relationship in the optical axis O direction, and the quadrant partition P2a of the partition converging element 152a and the partition The quadrant section P1a of the converging element 156a has a corresponding positional relationship in the direction of the optical axis O, and so on. Therefore, the effect of homogenization of the Besso beam BB can be enhanced, and the uniformity of the longitudinal light can be further corrected.

In the above-mentioned embodiment, the quadrants P1~P4, P1a~P8a of the partition converging elements 152, 152a, 156, 156a can be made of silicon-based liquid crystal, a diffractive optical element (DOE), and a Fresnel lens (Fresnel lens). ) Or a general lens. In addition, the aforementioned quadrant partitions P1 to P4 and P1a to P8a each include an optical surface, which may include a spherical surface, a parabolic surface, and a flat surface. In the above embodiment, the conical lens 151 and the lens element 153 can be made of any optical material, and can be the same or different materials.

Please refer to 1 again and in conjunction with FIG. 2, the Besso beam homogenization module 150 further includes an adjustment mechanism 158, which is electrically connected to the controller 120. The adjustment mechanism 158 can be slid in the Z-axis direction or the optical axis O direction under the control of the controller 120. The sliding range of the adjustment mechanism 158 is, for example, between 0 mm and 1000 mm. The partition converging element 152 is disposed on the adjusting mechanism 158, and the distance between the partition converging element 152 and the conical lens 151 and the lens element 153 can be adjusted by the sliding of the adjusting mechanism 158, so that the distance between the partition converging element 152 and the conical lens 151 and the lens element 153 can be adjusted. The length Z of the Bezos beam BB is increased or shortened in the Z-axis direction or the optical axis O direction. In other words, the adjustment mechanism 158 can slide between the conical lens 151 and the lens element 153 to adjust the distance between the partition converging element 152 and the conical lens 151 and the distance between the partition converging element 152 and the lens element 153, thereby adjusting The length Z of the Besso beam BB at the focus.

Through the above-mentioned configuration relationship, the Besso beam homogenization module 150 of this embodiment can homogenize the Besso beam to form a homogenized Besso beam BB at the focal point of the lens element 153, and is provided by the adjustment mechanism 158. The configuration can further adjust the length Z of the formed Besso beam BB. Accordingly, when the Besso beam BB generated by the Besso beam homogenization module 150 is used for micro-welding the object S clamped in the clamping base 170, it can be adapted to the welding of materials with different thicknesses of air layers, and It can improve the light penetration rate of the welding bead; and when it is used for micro-cutting, the length of the Besso beam can be adjusted without changing the Besso optical module, so that it can be used to cut transparent materials of different thicknesses. And can provide uniform cutting wall.

In addition, more optical elements may be included in the Bezos beam homogenization module 150 of the present disclosure. 5 is a schematic side view of the internal optical structure of the Bezos beam homogenization module according to another embodiment of the disclosure, and FIG. 6 is a side view of the internal optical structure of the Bezos beam homogenization module according to another embodiment of the disclosure Schematic. 5, the Besso beam homogenization module 150a of this embodiment further includes a concave lens 154, which is arranged between the partition converging element 152 and the lens element 153 to expand the Besso beam BB, so that the bezo The length Z of the cable beam BB can be further increased. In this embodiment, due to the configuration of the concave lens 154, the sliding range of the adjusting mechanism 158 is, for example, between 0-30 mm, or an adjusting mechanism with a larger sliding range can be selected to further increase the sliding range . Next, referring to FIG. 6, the Bezos beam homogenization module 150b of this embodiment, on the basis of the Bezos beam homogenization module 150a of the previous embodiment, further includes a convex lens 155, which is disposed on the concave lens 154 and the lens element 153 In this way, the length Z of the Bezos beam BB formed at the focal point of the lens element 153 can be further shortened. In this way, the adjustability of the Besso beam homogenization module in the length of the Besso beam can be effectively improved.

To sum up, in the Bezos beam homogenization module of the present disclosure, because the partition converging element with multiple quadrants is used, the Bezos beam formed by the Bezos beam homogenization module can have high longitudinal light uniformity. Moreover, by further arranging the zone-converging element on the adjustment mechanism that can slide relative to the conical lens and the optical element, the length of the formed Bezoe beam can be adjusted.

Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of this disclosure. Therefore, The scope of protection of this disclosure shall be subject to those defined by the attached patent scope.

100: Laser optical system 110: Laser light source 120: Controller 130: beam expander 140: reflective structure 150, 150a, 150b: Besso beam homogenization module 151: Cone mirror 152, 152a, 156, 156a: zone aggregation components 153: lens element 154: Concave lens 155: Convex lens 158: adjustment mechanism 160: The first mobile platform 170: Clamping base 180: The second mobile platform BB: Besso beam LG: Gaussian beam O: Optical axis P1~P4, P1a~P8a: quadrant division S: Object Z: Besso beam length

FIG. 1 is a schematic diagram of a laser optical system according to an embodiment of the disclosure. FIG. 2 is a schematic side view of the internal optical structure of the Bezos beam homogenization module in FIG. 1. FIG. 3A is a schematic top view of the partition converging element of FIG. 2. FIG. 3B is a schematic top view of a partition converging element according to another embodiment of the disclosure. FIG. 4A is a schematic diagram of a dual-zone convergent element according to an embodiment of the present disclosure. FIG. 4B is a schematic diagram of a dual-zone convergent element according to another embodiment of the disclosure. 5 is a schematic side view of the internal optical structure of a Bezos beam homogenization module according to another embodiment of the disclosure. 6 is a schematic side view of the internal optical structure of the Bezos beam homogenization module according to another embodiment of the present disclosure.

150: Besso beam homogenization module

151: Cone mirror

152: Partition Convergence Components

153: lens element

O: Optical axis

Z: Besso beam length

Claims (18)

A Bezos beam homogenization module, suitable for receiving a Gaussian beam, includes: A cone lens An optical element having a focal length; and A partition converging element includes multiple quadrant partitions and is located between the conical mirror and the optical element, Wherein, the Bezos-Gaussian beam sequentially passes through the conical lens, the zonal converging element and the optical element to form a Bezos-gaussian beam at a focal point of the optical element. For example, the Bezos beam homogenization module described in item 1 of the scope of patent application, wherein the number of the quadrant divisions of the division converging element is 2n, n≧2, and the shape of each of the quadrant divisions is a sector, the sector The apex angle is (180/n) degrees. For the Bezos beam homogenization module described in item 2 of the scope of patent application, the focal points of the quadrant divisions are all on the same optical axis as the axis of the division converging element, and any two adjacent quadrant divisions have different focal length. For the Bezos beam homogenization module described in item 2 of the scope of patent application, the focal points of the quadrant divisions are all on the same optical axis as the axis of the division converging element, and the focal lengths of the two quadrant divisions located on the diagonal Is equal. For the Besso beam homogenization module described in item 2 of the scope of patent application, the Besso beam formed by the Besso beam homogenization module satisfies the following formula:

as well as

,among them

Is the cone-shaped half-angle of the Besso beam,

Is the refractive index of the conical mirror,

Is the vacuum refractive index,

Is the vertex angle of the conical mirror,

Is the non-diffraction range, and

Is the waist of the Gaussian beam. The Besso beam homogenization module as described in item 5 of the scope of patent application, wherein the length of the Besso beam at the focus

,

Is a focal length of each of the quadrants in the zone converging element, and

Is the focal length of the optical element. For the Besso beam homogenization module described in item 6 of the scope of patent application, the partition converging element satisfies the following formula:

,

For the maximum design focal length of these quadrants, and

The minimum design focal length for these quadrant partitions. According to the Besso beam homogenization module described in the first item of the scope of patent application, a focal length of each of the quadrant divisions of the divisional converging element is between -1000 mm and 1000 mm. For example, the Bezos beam homogenization module described in the first item of the scope of patent application further includes an adjustment mechanism, wherein the partition converging element is disposed on the adjustment mechanism, and the adjustment mechanism adjusts the relative position of the partition converging element by sliding. The distance between the conical lens and the optical element is used to adjust the length of the Besso beam at the focus. For the Besso beam homogenization module described in item 7 of the scope of patent application, the sliding range of the adjustment mechanism is between 0 mm and 1000 mm. According to the Bezos beam homogenization module described in item 1 of the scope of the patent application, the quadrant divisions of the divisional converging element respectively include an optical surface, and the optical surface includes a spherical surface, a parabolic surface, and a flat surface. For the Bezos beam homogenization module described in item 1 of the scope of the patent application, the quadrant divisions of the division converging element are composed of silicon-based liquid crystal, diffractive optical element (DOE), and Fresnel lens ( Fresnel lens) or a general lens. The Bezos beam homogenization module described in item 1 of the scope of patent application, wherein the optical element includes a plurality of quadrant divisions, and the number of the quadrant divisions of the optical element is equal to the number of the quadrant divisions of the division converging element And both are 2n, n≧2. The Bezos beam homogenization module described in item 13 of the scope of patent application, wherein, in the optical element and the partition converging element, the shape of each of the quadrant partitions is a fan shape, and the apex angle of the fan shape is (180 /n) degrees. For example, in the Bezos beam homogenization module described in item 13 of the scope of patent application, the focal points of the quadrant divisions of the optical element are all coaxial with the axis of the optical element, and the focal points of the quadrant divisions of the division converging element are all coaxial with the axis of the optical element. It is coaxial with the axis of the partition converging element, and the optical element and the partition converging element are on the same optical axis. The Bezos beam homogenization module as described in item 13 of the scope of patent application, wherein the first quadrant of the zone converging element corresponds to one of the 2nd to 2n quadrants of the optical element in the optical axis direction. As described in the first item of the scope of patent application, the Bezos beam homogenization module further includes a concave lens disposed between the partition converging element and the optical element. As described in the first item of the patent application, the Bezos beam homogenization module further includes a convex lens disposed between the partition converging element and the optical element.

Images