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CN111123533A - Laser output head for spectrum beam combination and preparation method thereof - Google Patents

Laser output head for spectrum beam combination and preparation method thereof Download PDF

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Publication number
CN111123533A
CN111123533A CN201910386939.9A CN201910386939A CN111123533A CN 111123533 A CN111123533 A CN 111123533A CN 201910386939 A CN201910386939 A CN 201910386939A CN 111123533 A CN111123533 A CN 111123533A
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CN
China
Prior art keywords
optical fiber
fiber array
conduit
cooling water
end cap
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
Application number
CN201910386939.9A
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Chinese (zh)
Inventor
杨直
赵明祥
吕志国
李强龙
李峰
宋冬冬
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Hangzhou Aochuang Photonics Technology Co ltd
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Hangzhou Aochuang Photonics Technology Co ltd
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Priority to CN201910386939.9A priority Critical patent/CN111123533A/en
Publication of CN111123533A publication Critical patent/CN111123533A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • G02B27/12Beam splitting or combining systems operating by refraction only
    • G02B27/123The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • G02B27/1006Beam splitting or combining systems for splitting or combining different wavelengths
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0071Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

The invention discloses a laser output head for spectrum beam combination and a preparation method thereof, and aims to solve the problems of large volume and the like of the existing spectrum beam combination system. This product includes fiber array, cooling water pipe, pipe and collimating lens, fiber array and end cap butt fusion, the end cap is installed in the pipe, and fiber array's tail optical fiber department adopts the sealing member shutoff and fiber array seals in the pipe, and the pipe is fixed in the lens cone, and the outside at the pipe is established to the cooling water pipe cover, is provided with inlet opening and apopore on the cooling water pipe, and collimating lens fixes in the lens cone. The product fuses a plurality of optical fiber arrays with laser energy transmission function with an end cap, can reduce the power density of the end face of the optical fiber and bear higher laser power; the special collimating lens is arranged at the output end of the end cap of the product, so that multi-light path collimation output can be obtained, the whole structure of the device is compact due to the compact arrangement of the optical fiber beams, the space is saved, and the combined beam output with higher laser power can be obtained.

Description

Laser output head for spectrum beam combination and preparation method thereof
Technical Field
The invention relates to the field of fiber laser, in particular to a laser output head for spectrum beam combination.
Background
Since the advent of semiconductor pumping technology and double-clad fiber technology, fiber laser technology has developed rapidly and has been widely used in civilian and defense areas. With the continuous development of fiber laser technology, the output power of a fiber laser is higher and higher, but the further improvement of the single-fiber output laser power faces a great challenge due to the fiber nonlinear effect, the thermal effect and the mode instability effect. If a higher power level is to be obtained, a multi-unit beam combination mode is required.
The spectrum beam combination design based on the multilayer dielectric diffraction grating (MLD) is relatively simple, the requirement on unit beam control is low, phase control is not needed, the system stability is good, and meanwhile, the beam quality of a diffraction limit can be realized, so that the spectrum beam combination design is a better choice for realizing high-power and high-beam-quality laser output of an optical fiber laser. The specific method is that two MLD gratings with identical parameters are placed in parallel, and the central wavelength of N paths is lambda1λ2λ3...λnAfter being collimated, the narrow-linewidth fiber laser is parallelly incident on a first MLD grating at equal intervals, 1-order diffracted beams of N paths of light beams which are dispersed by the first MLD grating are incident on the same position of a second MLD grating to be overlapped, and N paths of output light beams which are diffracted by the second MLD grating have the same emergent angle, so that the same-direction output of multiple paths of light beams can be realized, and the spectrum beam combination of the multiple paths of light beams can be realized.
The unit volume of the traditional collimator is large, the volume of a formed laser array spectrum beam combining system is large, light beams are easy to shake, and the traditional collimator cannot be applied to actual industrial production; and the increase of the number of synthesis sub-paths is limited, the expansion of the array scale cannot be realized, the improvement of the total output power is limited, and people also carry out research in relevant aspects.
Disclosure of Invention
The present invention is directed to a laser output head for spectrum beam combination, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a laser output head for spectrum beam combination comprises an optical fiber array, a cooling water conduit, a conduit and a collimating lens, wherein the optical fiber array is welded with an end cap, the end cap is installed in the conduit and is solidified, a tail fiber of the optical fiber array is plugged by a sealing piece and sealed in the conduit, the conduit is fixed in a lens barrel, the connection part of the conduit and the lens barrel is sealed, the cooling water conduit is sleeved outside the conduit and sealed with the connection part of the cooling water conduit and the conduit, a water inlet hole and a water outlet hole are formed in the cooling water conduit, and the collimating lens is fixed in the lens barrel.
As a further scheme of the invention: the optical fiber array comprises a first groove, a second groove, a first cover plate, a second cover plate, a bottom plate and optical fibers, wherein the first groove and the second groove are fixed on the bottom plate, the optical fibers are sequentially arranged in the first groove and the second groove, each optical fiber is arranged in parallel, the output end of each optical fiber is located in the same plane, coating layers between adjacent optical fibers are tightly tangent, the first cover plate is tightly pressed at the upper end of the first groove and solidified by glue, and the second cover plate is tightly pressed at the upper end of the second groove and solidified by glue.
As a further scheme of the invention: the first slot and the second slot are both V-shaped slots, so that each optical fiber is ensured to be tangent to the two sides of the first slot and the second slot, rolling is not easy to occur, and curing is facilitated.
As a further scheme of the invention: the end cap is made of quartz materials, the materials are easy to obtain and convenient to weld, the conduit is made of copper materials, and the end cap is low in price and good in using effect.
As a further scheme of the invention: the tail fiber of the optical fiber array is sleeved in the protective layer, and the protective layer is fixed in the cooling water guide pipe and can protect the tail fiber.
As a further scheme of the invention: the collimating lens is fixed in the lens barrel by adopting the pressing ring, has good connecting effect and is not easy to fall off.
As a further scheme of the invention: the outer diameter of the conduit is 6mm, the volume is small, the sealing element adopts a sealing plug with an array aperture of 550 mu m, the tail fiber can be firmly sealed, and the operation of the whole device is ensured.
As a further scheme of the invention: the optical fiber array is welded with the end cap through a carbon dioxide welding machine or a large-core-diameter three-electrode welding machine, the technology is mature, and the processing is convenient.
The preparation method of the laser output head for spectrum beam combination comprises the following specific steps:
firstly, welding the optical fiber array and an end cap together, removing a coating layer of the optical fiber array, soaking the optical fiber array in alcohol, and cleaning the exposed optical fiber array by using ultrasonic waves;
fixing the end cap after welding in the guide tube and solidifying by glue, sealing the tail fiber of the fiber array by a sealing element, sealing the fiber array with the coating removed in the guide tube, fixing the guide tube in the lens cone, sealing the contact position of the guide tube and the lens cone by the glue, installing the cooling water guide tube, sealing the contact position of the guide tube and the cooling water guide tube by the glue, and allowing cooling water to flow in from the water inlet hole at the moment to dissipate heat and flow out from the water outlet hole;
and step three, mounting the collimating lens in the lens barrel.
Compared with the prior art, the invention has the beneficial effects that:
the product has reasonable design, and can reduce the power density of the end face of the optical fiber and bear higher laser power by fusing a plurality of optical fiber arrays with laser energy transmission function with one end cap;
the special collimating lens is arranged at the output end of the end cap of the optical fiber array, multi-light-path collimating output can be obtained, the optical fiber bundles are closely arranged, the integral structure of the optical fiber array is compact, the space is saved, the array scale expansion is facilitated, the combined beam output with higher laser power can be obtained, and the practicability of light beam synthesis is improved.
Drawings
Fig. 1 is a perspective view of an array of optical fibers in a laser output head for spectral beam combining.
Fig. 2 is a cross-sectional view of a laser output head for spectral beam combining.
Fig. 3 is a schematic structural diagram of a manufactured optical fiber array in a laser output head for spectral beam combination.
Fig. 4 is a perspective view of an array of optical fibers with end caps fused in a laser output head for spectral beam combining.
Fig. 5 is a front view of an array of optical fibers with end caps fused in a laser output head for spectral beam combining.
Fig. 6 is a schematic diagram of a spectrally combined beam for dual MLD dispersion compensation in a spectrally combined laser output head.
Wherein: 1-a first slot, 2-a second slot, 3-a first cover plate, 4-a second cover plate, 5-a bottom plate, 6-a protective layer, 7-a water inlet, 8-a water outlet, 9-a cooling water conduit, 10-a sealing member, 11-an optical fiber array, 12-a conduit, 13-an end cap, 14-a collimating lens, 15-a pressing ring and 16-a lens cone.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
A laser output head for spectrum beam combination comprises an optical fiber array 11, a cooling water conduit 9, a conduit 12 and a collimating lens 14, wherein the optical fiber array 11 is welded with an end cap 13, the end cap 13 is installed in the conduit 12 and is solidified by glue, a tail fiber of the optical fiber array 11 is sealed by a sealing element 10, the optical fiber array 11 is sealed in the conduit 12, the conduit 12 is fixed in a lens barrel 16, the connection part of the conduit 12 and the lens barrel 16 is sealed, the cooling water conduit 9 is sleeved outside the conduit 12, the connection part of the cooling water conduit 9 and the conduit 12 is sealed, a water inlet hole 7 and a water outlet hole 8 are formed in the cooling water conduit 9, the collimating lens 14 is fixed in the lens barrel 16, and the volume of the whole device can be greatly reduced.
The end cap 13 is made of quartz materials, the materials are easy to obtain and convenient to weld, the guide pipe 12 is made of copper materials, and the end cap is low in price and good in using effect.
The tail fiber of the optical fiber array 11 is sleeved in the protective layer 6, and the protective layer 6 is fixed in the cooling water conduit 9 and can protect the tail fiber.
The outer diameter of the conduit 12 is 6mm, the volume is small, and the sealing element 10 adopts a sealing plug with an array aperture of 550 mu m, so that the tail fiber can be firmly sealed, and the operation of the whole device is ensured.
The preparation method of the laser output head for spectrum beam combination comprises the following specific steps:
firstly, welding an optical fiber array 11 and an end cap 13 made of quartz together, removing a coating layer of the optical fiber array 11, soaking the optical fiber array 11 in alcohol, and cleaning the exposed optical fiber array 11 by using ultrasonic waves;
fixing the end cap 13 after welding in the guide tube 12 and solidifying by glue, sealing the tail fibers of the optical fiber array 11 by adopting a plurality of sealing plugs with the array aperture of 550 microns, sealing the optical fiber array 11 after removing the coating layer in the guide tube 12 with the outer diameter of 6mm, fixing the guide tube 12 in the lens cone 16, sealing the contact position of the guide tube 12 and the lens cone 16 by adopting glue, installing the cooling water guide tube 9, sealing the contact position of the guide tube 12 and the cooling water guide tube 9 by adopting glue, leading cooling water to flow in from the water inlet hole 7 at the moment, dissipating heat, leading the cooling water to flow out from the water outlet hole 8, sleeving the tail fibers of the optical fiber array 11 into the protective layer 6, and fixing the protective layer 6 in the cooling water guide tube 9 by adopting a top thread to protect the tail fibers;
and step three, installing the collimating lens 14 in the lens barrel 16.
Example 2
A laser output head for spectrum beam combination comprises an optical fiber array 11, a cooling water conduit 9, a conduit 12 and a collimating lens 14, wherein the optical fiber array 11 is welded with an end cap 13, the end cap 13 is installed in the conduit 12 and is solidified by glue, a tail fiber of the optical fiber array 11 is sealed by a sealing element 10, the optical fiber array 11 is sealed in the conduit 12, the conduit 12 is fixed in a lens barrel 16 and is sealed with the joint of the conduit 12 and the lens barrel 16, the cooling water conduit 9 is sleeved outside the conduit 12 and is sealed with the joint of the cooling water conduit 9 and the conduit 12, the cooling water conduit 9 is provided with a water inlet hole 7 and a water outlet hole 8, the collimating lens 14 is fixed in the lens barrel 16, the optical fiber array 11 comprises a first slot 1, a second slot 2, a first cover plate 3, a second cover plate 4, a bottom plate 5 and optical fibers, the first slot 1 and the second slot 2 are both fixed on the bottom plate 5, the optical fibers are sequentially arranged in the first slot, each optical fiber is arranged in parallel, the output end of each optical fiber is located in the same plane, the coating layers between the adjacent optical fibers are closely tangent, the first cover plate 3 is pressed at the upper end of the first open groove 1 and is solidified by glue, and the second cover plate 4 is pressed at the upper end of the second open groove 2 and is solidified by glue.
The first slot 1 and the second slot 2 are both V-shaped slots, so that each optical fiber is ensured to be tangent to the two sides of the first slot 1 and the second slot 2, and the optical fiber is not easy to roll and convenient to cure.
The collimating lens 14 is fixed in the lens barrel 16 by the pressing ring 15, so that the connecting effect is good and the lens is not easy to fall off.
The optical fiber array 11 is welded with the end cap 13 through a carbon dioxide welding machine or a large-core-diameter three-electrode welding machine, the technology is mature, and the processing is convenient.
The preparation method of the laser output head for spectrum beam combination comprises the following specific steps:
firstly, taking a plurality of optical fibers, stripping a section of coating layer of each optical fiber by using an optical fiber wire stripper or a blade, cleaning the optical fibers by using ultrasonic waves, flattening the optical fibers by using a cutter, fixing a first notch 1 and a second notch 2 on a bottom plate 5 by using ultraviolet glue, wherein the first notch 1 and the second notch 2 both adopt V-shaped grooves, ensuring that V-shaped arrays of the first notch 1 and the second notch 2 are strictly aligned, and sequentially arranging the areas of the optical fibers with the coating layers removed in the first notch 1 and the second notch 2 under a microscope to ensure that each optical fiber is tangent to two sides of the first notch 1 and the second notch 2; the coating layers of adjacent optical fibers are closely tangent; keeping the optical fibers in all paths to be strictly parallel, enabling the output ends to be in the same plane, respectively placing a first cover plate 3 and a second cover plate 4 on a first open groove 1 and a second open groove 2, compressing, irradiating by using a UV lamp to solidify glue, polishing the optical fibers with coatings removed to form an optical fiber array 11, welding the optical fiber array 11 and an end cap 13 together, soaking a bonding part of a bottom plate 5 and the first open groove 1 and a bonding part of the bottom plate 5 and the second open groove 2 in alcohol to separate the bottom plate 5 from the first open groove 1 and the second open groove 2 respectively, soaking a bonding part of the second cover plate 4 and the second open groove 2 in the alcohol to separate the second cover plate 4 and the second open groove 2 from the optical fibers, and cleaning the exposed optical fiber array 11 by using ultrasonic waves;
step two, welding an end cap 13 with an optical fiber array 11 by using a carbon dioxide welding machine, fixing the welded end cap 13 in a guide tube 12 and solidifying by using glue, sealing a tail fiber of the optical fiber array 11 by using a sealing element 10, sealing the optical fiber array 11 with a coating layer removed in the guide tube 12, fixing the guide tube 12 in a lens barrel 16, sealing the contact position of the guide tube 12 and the lens barrel 16 by using the glue, installing a cooling water guide tube 9, sealing the contact position of the guide tube 12 and the cooling water guide tube 9 by using the glue, and allowing cooling water to flow in from a water inlet 7 at the moment to dissipate heat and allowing the cooling water to flow out from a water outlet 8;
and step three, mounting the collimating lens 14 in the lens barrel 16 by adopting the pressing ring 15 to obtain a finished product, wherein the finished product optical fiber bundles are closely arranged, the structure is compact, the space is saved, and the practicability of light beam synthesis is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. A laser output head for spectrum beam combination comprises an optical fiber array (11), a cooling water conduit (9), a conduit (12) and a collimating lens (14), wherein the optical fiber array (11) is welded with an end cap (13), the end cap (13) is installed in the conduit (12) and solidified, a tail fiber of the optical fiber array (11) is sealed by a sealing element (10) and the optical fiber array (11) is sealed in the conduit (12), the conduit (12) is fixed in a lens barrel (16) and the joint of the conduit (12) and the lens barrel (16) is sealed, the cooling water conduit (9) is sleeved outside the conduit (12) and the joint of the cooling water conduit (9) and the conduit (12) is sealed, and the collimating lens (14) is fixed in the lens barrel (16).
2. The laser output head for spectral beam combination according to claim 1, wherein the optical fiber array (11) comprises a first slot (1), a second slot (2), a first cover plate (3), a second cover plate (4), a base plate (5) and optical fibers, the first slot (1) and the second slot (2) are fixed on the base plate (5), the optical fibers are sequentially arranged in the first slot (1) and the second slot (2), each optical fiber is arranged in parallel, the output end of each optical fiber is located in the same plane, the first cover plate (3) is pressed at the upper end of the first slot (1) and is cured by glue, and the second cover plate (4) is pressed at the upper end of the second slot (2) and is cured by glue.
3. The laser output head for spectral beam combining according to claim 2, characterized in that the first (1) and second (2) trenches each employ a V-groove.
4. The laser output head for spectral beam combination according to claim 1, wherein the cooling water conduit (9) is provided with a water inlet hole (7) and a water outlet hole (8), the end cap (13) is made of quartz material, and the conduit (12) is made of copper material.
5. The laser output head for spectral beam combining according to claim 1, characterized in that the pigtails of the fiber array (11) are nested in a protective layer (6), and the protective layer (6) is fixed in a cooling water conduit (9).
6. The laser output head for spectral beam combining according to claim 1, characterized in that the collimating lens (14) is fixed inside a lens barrel (16) with a clamping ring (15).
7. The laser output head for spectral beam combining according to claim 1 or 4, characterized in that the outer diameter of the conduit (12) is 6mm, and the sealing element (10) is a sealing plug with an array aperture of 550 μm.
8. The laser output head for spectral beam combining according to claim 1, wherein the optical fiber array (11) is fused to the end cap (13) by a carbon dioxide fusion splicer or a large core diameter three-electrode fusion splicer.
9. A method for manufacturing a laser output head for spectral beam combining according to any of claims 1 to 8, comprising the steps of:
firstly, welding an optical fiber array (11) and an end cap (13) together, removing a coating layer of the optical fiber array (11), soaking the optical fiber array in alcohol, and cleaning the exposed optical fiber array (11) by using ultrasonic waves;
fixing the end cap (13) after welding in a guide pipe (12) and solidifying by glue, sealing the tail fiber of the optical fiber array (11) by using a sealing element (10), sealing the optical fiber array (11) after removing a coating layer in the guide pipe (12), fixing the guide pipe (12) in a lens cone (16), sealing the contact position of the guide pipe (12) and the lens cone (16) by using the glue, installing a cooling water guide pipe (9), sealing the contact position of the guide pipe (12) and the cooling water guide pipe (9) by using the glue, wherein cooling water flows in from a water inlet (7) at the moment, and flows out from a water outlet (8);
and step three, installing the collimating lens (14) in the lens barrel (16).
CN201910386939.9A 2019-05-10 2019-05-10 Laser output head for spectrum beam combination and preparation method thereof Pending CN111123533A (en)

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CN113093340A (en) * 2021-03-19 2021-07-09 中国航天时代电子有限公司 Optical fiber collimator resistant to strong explosion impact

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