CN117526094A - Laser compression condensed light system - Google Patents

Laser compression condensed light system Download PDF

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Publication number
CN117526094A
CN117526094A CN202311758647.6A CN202311758647A CN117526094A CN 117526094 A CN117526094 A CN 117526094A CN 202311758647 A CN202311758647 A CN 202311758647A CN 117526094 A CN117526094 A CN 117526094A
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laser
light
laser beam
polarization
lasers
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黄文杰
李虎
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Guangzhou Guanglian Electronic Technology Co ltd
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Guangzhou Guanglian Electronic Technology Co ltd
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Priority to CN202311758647.6A priority Critical patent/CN117526094A/en
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    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • 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
    • H01S5/02255—Out-coupling of light using beam deflecting elements

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention discloses a laser compression light combining system, which comprises: the first laser light source emits a first laser beam; the second laser light source emits a second laser beam; the wave plate is used for changing the polarization direction of the first laser beam or the second laser beam to deflect the first laser beam or the second laser beam by 90 degrees+/-k degrees so as to obtain a third laser beam; the polarization light combining element is used for combining one of the first laser beam and the second laser beam with the third laser beam, wherein the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, and the first laser source and the second laser source both comprise a laser group integrally packaged by a plurality of lasers which are arranged in a linear or array manner; the laser compression light combining system further comprises a light path turning piece obliquely arranged on the light paths of the first laser light source and the second laser light source. The laser pressure condensation optical system has high energy density per unit area and compact structure, and can meet the laser processing requirement.

Description

Laser compression condensed light system
Technical Field
The invention relates to the field of laser light sources, in particular to a laser compression light combining system.
Background
The semiconductor laser has the advantages of small volume and high energy density, and has been widely used in the fields of projection, illumination, cutting and the like. In particular, for laser cutting, the energy density requirement of a unit area is more strict, the power of a single laser is limited, the requirement of laser cutting processing is difficult to meet, and the laser beams of a plurality of lasers are required to be combined together, and the laser beams are further compressed, so that the energy density of the laser beams is improved. The existing laser systems in the market mostly adopt a plurality of single lasers to arrange, and the interval between laser beams is reduced through a total reflection mirror and a semi-transparent semi-reflection mirror, but because the initial gap of the laser is larger, the volume of the whole laser source is larger, so that the requirements of high energy density and small volume are difficult to meet simultaneously.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provides a laser compression light combining system which has high energy density per unit area and compact structure and can meet the laser processing requirement.
The technical scheme adopted by the invention is as follows:
a laser compression light combining system comprising: the first laser light source emits a first laser beam; the second laser light source emits a second laser beam; the wave plate is used for changing the polarization direction of the first laser beam or the second laser beam to deflect 90 degrees+/-k degrees to obtain a third laser beam, wherein k is more than or equal to 0 and less than or equal to 10; the polarization light combining element is used for combining one of the first laser beam and the second laser beam with the third laser beam; the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, and the first laser source and the second laser source comprise laser groups integrally packaged by a plurality of lasers which are arranged in a linear or array mode; the laser compression light combining system further comprises a light path turning piece obliquely arranged on the light paths of the first laser light source and the second laser light source, wherein the light path turning piece comprises a first inclined plane facing the laser group and a second inclined plane facing away from the laser group, and the second inclined plane is arranged in parallel with the first inclined plane; the first inclined surface is provided with first reflecting layers which are distributed at intervals, and the second inclined surface is provided with a second reflecting layer; the light of part of the lasers is reflected by the second reflecting layer after being refracted in the light path turning part through the first inclined surface, and is emitted from the gap and/or the edge of the first reflecting layer, the light of part of the lasers is emitted through the first reflecting layer, the polarization direction of the first laser beam or the second laser beam is parallel or perpendicular to the incident surface, and the incident surface is a plane formed by the normal line of the first inclined surface and the first laser beam or the second laser beam.
In one embodiment, the polarization splitting surface of the polarization light combining element is obliquely arranged on the light paths of the first laser beam and the second laser beam; the polarization beam splitter transmits the first laser beam or the second laser beam and reflects the third laser beam, or the polarization beam splitter reflects the first laser beam or the second laser beam and transmits the third laser beam.
In one embodiment, the laser groups of the first laser light source and the second laser light source are installed on the same horizontal plane, and the initial emitting direction of the laser groups is the same as the emitting direction of the light beam after light combination.
In one embodiment, a light guide member is arranged on the light path of the first laser light source, and the first laser beam is condensed by the light path turning member and then guided to the polarization light combining element by the light guide member; the wave plate is arranged on the optical path of the second laser light source and is used for changing the polarization direction of the second laser beam to deflect the second laser beam by 90 degrees+/-k degrees so as to obtain a third laser beam.
In one embodiment, the light guide is a reflecting mirror, and a reflecting surface of the reflecting mirror is parallel to the first inclined surface of the light path turning part on the light path of the first laser light source; the first inclined surface of the light path turning part on the light path of the second laser light source is parallel to the polarization splitting surface of the polarization combining element.
In one embodiment, the polarization beam combining element is a polarization beam combining lens, the incident angle of the first laser beam to the polarization beam combining lens is gamma, the refraction angle is theta, and the refractive index of the polarization beam combining lens is n 3 Air refractive index n 1 The thickness of the polarization light combining lens is t, and the refractive offset distance of the first laser beam in the polarization light combining lens is as follows:
k 2 is an error coefficient of 0.98.ltoreq.k 2 ≤1.02。
In one embodiment, the polarization combining element is a polarization combining prism.
In one embodiment, the light path turning member is a light-transmitting optical member, and the first inclined surface and the second inclined surface are integrally formed.
In one embodiment, the laser group includes n first lasers disposed adjacently and m second lasers disposed adjacently, the light of the first lasers is reflected and emitted through the first reflecting layer, the light of the second lasers is emitted from the gap and/or the edge of the first reflecting layer, and the thickness C of the optical path turning member satisfies:
wherein A is the original distance between the optical axes of the first second laser and the first laser in the same direction; b is the optical axis distance between the first second laser and the first laser after the light of the first laser passes through the light path turning part; α is an incident angle α of the second laser to the second region; n is n 1 Refractive index n of the space environment where the second laser is located 2 The refractive index of the optical path turning part; k (k) 1 Is an error coefficient of 0.95.ltoreq.k 1 ≤1.05。
In one embodiment, the angle of incidence α is in the range of 30.ltoreq.α.ltoreq.60 °.
In one embodiment, the first inclined surface is further provided with an anti-reflection layer, the anti-reflection layer is arranged avoiding the first reflection layer, the projection of the first reflection layer on the plane where the laser group is located completely covers the first laser, and the gap between the optical axes of adjacent lasers in the laser group is 0.5-2 mm.
Compared with the prior art, the invention has the beneficial effects that: the laser group adopts integrally packaged lasers, the energy density of the emergent laser beam per unit area is higher, the beam shrinking effect of the laser beams of the laser group is realized by arranging the light turning piece, the laser beams are further compressed, the light combining of the two laser groups is further realized by the wave plate and the polarization light combining element, the energy density of the light source system is further improved, and the laser compression light combining system has the advantages of small volume and high energy density.
Drawings
Fig. 1 is a schematic diagram of the laser compression light combining system of example 1.
Fig. 2 is a structural view of a first laser light source and an optical path turning member of embodiment 1.
Fig. 3 is a schematic diagram of the optical path turning member of embodiment 1.
Fig. 4 is a schematic view of the optical path of the beam splitting/combining lens of embodiment 1.
Fig. 5 is a schematic diagram of the first laser light source and the optical path turning member in embodiment 1.
Fig. 6 is a second schematic optical path diagram of the first laser light source and the optical path turning member of embodiment 1.
Fig. 7 is a cross-sectional view of an original beam of the first laser light source of embodiment 1.
Fig. 8 is a beam cross-sectional view of the first laser light source of embodiment 1 after the beam is compressed by the optical path turning member.
Fig. 9 is a raw beam energy distribution diagram of the first laser light source of embodiment 1.
Fig. 10 is a beam energy distribution diagram of the beam of the first laser light source of embodiment 1 after being compressed by the optical path turning member.
Fig. 11 is a schematic diagram of the laser compression light combining system of example 2.
Fig. 12 is a schematic view of the structure of a polarization beam combining prism of example 2.
Reference numerals illustrate: 100. a first laser light source; 200. a second laser light source; 300. a wave plate; 410. a polarized light combining lens; 420. a polarization light combining prism; 421. a light incident surface; 422. a light-emitting surface; 423. a first surface; 424. a second surface; 425. a polarization splitting plane; 500. a light guide; 10. a laser group; 20. an optical path turning member; 21. a first inclined surface; 21a, a first region; 21b, a second region; 211. a first reflective layer; 212. an anti-reflection layer.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The existing compressed laser structure in the market mostly adopts a plurality of single lasers to arrange, and the interval between laser beams is reduced through a total reflecting mirror and a semi-transparent semi-reflecting mirror, but because the initial gap of the laser is larger, the volume of the whole laser source is larger, so that the requirements of high energy density and small volume are difficult to meet simultaneously. In particular, the combination of total reflection mirrors and half-reflection mirrors is not suitable for laser assemblies which are arranged relatively closely.
Based on this, the present application proposes the following laser compression light combining system.
Example 1
As shown in fig. 1, 2 and 3, the present embodiment discloses a laser compression light combining system, which includes:
a first laser light source 100 for emitting a first laser beam;
a second laser light source 200 emitting a second laser beam;
the wave plate 300 is used for changing the polarization direction of the first laser beam or the second laser beam to deflect 90 degrees+/-k degrees, wherein k is more than or equal to 0 and less than or equal to 10 degrees (the wave plate 300 theoretically deflects the polarization direction of the first laser beam or the second laser beam to deflect 90 degrees, but a certain error k can exist in practice, and the third laser beam is obtained under the condition that the error range is not large;
the polarization light combining element is used for combining one of the first laser beam and the second laser beam with the third laser beam;
wherein the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, and the first laser source 100 and the second laser source 200 each comprise a laser group 10 integrally packaged by a plurality of lasers arranged in a linear or array manner;
the laser compression light combining system further comprises a light path turning piece 20 obliquely arranged on the light paths of the first laser light source 100 and the second laser light source 200, wherein the light path turning piece 20 comprises a first inclined surface 21 facing the laser set 10 and a second inclined surface 22 facing away from the laser set 10, and the second inclined surface 22 is parallel to the first inclined surface 21; wherein, the first inclined surface 21 is provided with first reflective layers 211 which are distributed at intervals, and the second inclined surface 22 is provided with a second reflective layer (not labeled in the view angle problem diagram); the light of part of the lasers is refracted in the light path turning element 20 through the first inclined surface 21 and then reflected by the second reflecting layer, and is emitted from the gap and/or the edge of the first reflecting layer 211, the light of part of the lasers is emitted through the reflection of the first reflecting layer 211, the polarization direction of the first laser beam or the second laser beam is parallel or perpendicular to the incident plane, and the incident plane is a plane formed by the normal line of the first inclined surface 21 and the first laser beam or the second laser beam.
The laser set 10 of this embodiment is formed by integrally packaging a plurality of lasers in a linear or array arrangement, and since the plurality of lasers are integrally packaged, the gap between adjacent lasers is small, the laser beam emitted by the laser set 10 itself is small, and the energy density of the laser beam per unit area is high. The light path turning piece 20 is used to make part of the light of the laser exit from the gap and/or edge of the first reflecting layer 211, and part of the light of the laser exits through the first reflecting layer 211, so as to realize the beam shrinking effect of the laser beams of the laser set 10, further compress the laser beams and further improve the energy density of the laser beams in unit area. Further, the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light (i.e. near to linearly polarized light) with the same initial polarization direction, in this embodiment, one of the two laser sources is deflected by the wave plate 300, the polarization direction of the laser beam passing through the wave plate 300 is changed to deflect by 90 °, and the laser beam is combined by the polarization light combining element, so that the energy density of the light source system is further improved, and the laser compression light combining system has the advantages of small volume and high energy density.
Further, as shown in fig. 1 and 4, the polarization light combining element in this embodiment is a polarization light combining lens 410, and a polarization light splitting surface 411 of the polarization light combining element in this embodiment is obliquely disposed on the light paths of the first laser beam and the second laser beam, and the polarization light splitting surface 411 transmits the first laser beam or the second laser beam and reflects the third laser beam. Because the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, the emitted laser beams are the same, so that in order to achieve the light combination of the two laser sources, the volume of the light combination system is not too large, in this embodiment, the polarization direction of one of the laser sources is changed by using the wave plate 300, and then the light combination is achieved by using the polarization light combination element. In another embodiment, the polarization beam splitter of the polarization beam combining element may reflect the first laser beam or the second laser beam and transmit the third laser beam.
Further, in the present embodiment, the laser groups 10 of the first laser light source 100 and the second laser light source 200 are installed on the same horizontal plane, and the initial emitting direction of the laser groups 10 is the same as the emitting direction of the combined light beam. The design is convenient for installing all parts in the laser compression light combining system.
Further, as shown in fig. 1, a light guide 500 is disposed on the optical path of the first laser light source, and the first laser beam is condensed by the optical path turning element 20 and then guided to the polarization beam combining lens 410 by the light guide 500; the wave plate 300 is disposed on the optical path of the second laser light source 200, and is used for changing the polarization direction of the second laser beam to deflect 90+±k°, so as to obtain a third laser beam. More specifically, the wave plate 300 is disposed between the laser group 10 of the second laser light source 200 and the optical path turning member 20. In other embodiments, the wave plate 300 may also be disposed between the optical path turning member 20 and the polarization combining lens 410. It should be noted that, between the laser set 10 and the optical path turning element 20, and between the optical path turning element 20 and the polarization beam combining prism 410, the laser set is located between the two along the laser optical path direction. In other embodiments, the wave plate may also be disposed on the optical path of the first laser light source.
Further, the light guide 500 is a reflecting mirror, and a reflecting surface of the reflecting mirror is parallel to the first inclined surface 21 of the light path turning member 20 on the light path of the first laser light source 100; the first inclined surface of the optical path turning member 20 on the optical path of the second laser light source 200 is parallel to the polarization splitting surface of the polarization combining element.
Further, as shown in fig. 4, the first laser beam is incident on the polarization beam combining lens 410 with an incident angle γ and an refraction angle θ, and the polarization beam combining lens 410 has a refractive index n 3 Air refractive index n 1 The thickness of the polarization beam combining lens 410 is t, and the refractive offset distance of the first laser beam in the polarization beam combining lens 410 is as follows:
k 2 is the error coefficient. Further, the k is 2 The method comprises the following steps: k is more than or equal to 0.98 2 Less than or equal to 1.02. The thickness t of the polarization combining lens 410 of the present embodiment refers to the length in the direction parallel to the normal line at which the laser beam is incident.
Further, the optical path turning member 20 is a light-transmitting optical member, and the first inclined surface 21 and the second inclined surface 22 are integrally formed. I.e. the light path turning element 20 is a single light transmitting optical element. The design can effectively realize the beam turning compression of the integrally packaged laser module, compared with the prior scheme of adopting a plurality of reflectors, the optical path turning part of the technical scheme is simple and convenient to process and controllable in precision, and the turning compression of the beam can be completed only by arranging one optical path turning part, so that the assembly process is further simplified, and the space volume of a laser compression system is reduced.
Further, the laser set 10 in this embodiment includes n first lasers 11 disposed adjacently and m second lasers 12 disposed adjacently, where the light of the first lasers 11 is reflected and emitted through the first reflective layer 211, and the light of the second lasers 12 is emitted from the gap and/or edge of the first reflective layer 211.
As shown in fig. 3, the first inclined surface 21 is further provided with an anti-reflection layer 212, and the anti-reflection layer 212 is disposed avoiding the first reflection layer 211, so as to increase the laser transmittance and enhance the light efficiency. The projection of the first reflective layer 211 onto the plane of the laser set 10 completely covers the first laser 11.
In more detail, in the present embodiment, the first inclined surface 21 includes a first area 21a and a second area 21b, the projections of the first area 21a and the second area 21b on the plane where the laser set 10 is located completely cover the first laser 11 and the second laser 12, respectively, and the first area 21a is located at one end of the first inclined surface 21 away from the laser set 10; the first reflection layer 211 is disposed in the first region 21a, and the anti-reflection layer 212 is disposed in the second region 21b; the anti-reflection layer 212 of the present embodiment is also disposed between the first reflection layers 211. The n first lasers 11 correspond to the first area 21a, the m second lasers 12 correspond to the second area 21b, the first reflective layers 211 are distributed at intervals, and the first reflective layers 211 distributed at intervals correspond to the n first lasers 11 one by one. That is, the light beams emitted by the n first lasers 11 are respectively projected to the n first reflective layers 211 disposed at intervals in the first region 21a, then reflected and emitted, and the light beams emitted by the m second lasers 12 are projected to the second region 21b, enter the optical path turning member 20 to be refracted, and then reflected by the second reflective layers and finally emitted from the gaps and/or edges between the first reflective layers 211.
In order to make the light beams uniform and facilitate assembly and processing, the number n of the first lasers 11 is equal to the number m of the second lasers 12 in this embodiment, and the lasers are equidistantly arranged. That is, the beam emitted by the first laser 11 is the same as the beam emitted by the second laser 12, and the finally emitted beam is the beam of the first laser 11 and the beam of the second laser 12 to be emitted alternately. In other embodiments, n=m±1 may be used.
In this embodiment, the thickness C of the optical path turning member satisfies:
wherein A is the original distance between the optical axes of the first second laser and the first laser in the same direction; b is the optical axis distance between the first second laser and the first laser after the light of the first laser passes through the light path turning part; α is an incident angle α of the second laser to the second region; n is n 1 Refractive index n of the space environment where the laser group is located 2 The refractive index of the optical path turning part; k (k) 1 Is an error coefficient of 0.95.ltoreq.k 1 ≤1.05。
Specifically, as shown in fig. 5-6, in this embodiment, the laser set 10 includes four lasers arranged in an equidistant manner, and two first laser sources 100 are taken as an example, two first lasers 11 (first two from the right in the drawing) and two second lasers 12 (first two from the left in the drawing) are taken as examples, the two second lasers 12 first refract through the optical path turning member 20 and then reflect and then emit, the two first lasers 11 directly reflect and emit through the optical path turning member 20, a is the original distance between the optical axes of the first second lasers 12 (first lasers from the left to the right in the drawing) and the first lasers 11 (third lasers from the left to the right in the drawing), and B is the optical axis distance β between the first second lasers 12 and the first lasers 11 after passing through the optical path turning member 20, and is the refraction angle between the second lasers 12 and the second region 21B after entering the second region 21B.
By law of refraction n 1 sinα＝n 2 sinβ
The method can obtain:
therefore, the optical path turning member 20 has a thickness C of:
namely:
where α has an angle range of 0 ° < α < 90 °, but according to practical situations, it is generally selected that α is 30 ° -60 °, beyond which the difficulty of processing the optical path turning member 20 increases, or the reflected laser light is blocked by the laser itself, so that the incident angle α of the second laser 12 to the second region 21b in this embodiment has an angle range of 30 ° -60 °.
The thickness C of the optical path turning member 20 refers to the distance between the first inclined surface 21 and the second inclined surface 22.
The error coefficient k 1 In the range of 0.95.ltoreq.k 1 And less than or equal to 1.05, the processing thickness of the optical path turning piece 20 allows a certain error, and effective beam shrinking can be realized within the error range. More preferably, the range of the error coefficient k is 0.98-1.02, the error is smaller, the beam shrinking effect is better, and the emergent light beam is more uniform.
In this embodiment, the laser set 10 is disposed in an air environment, n 1 The value is 1, and the optical path turning element 20 is inclined by 45 degrees, that is, the included angle between the laser and the optical path turning element 20 is 45 degrees, for example, α=45 degrees, and b=1/4A. In other embodiments, the optical path turning element 20 may be set to other inclined angles according to practical situations, so as to obtain compressed light beams in different directions, thereby meeting application requirements.
When a=2.5 mm, b=0.625 mm, n2=1.5168, the theoretical value of the thickness C of the optical path turning member 20 is 2.516mm, about 2.5mm, and the thickness C of the optical path turning member 20 may be in the range of 2.5±0.05mm due to the error coefficient.
Fig. 7-8 are schematic cross-sectional views of laser beams obtained by optical simulation software lighttools, wherein fig. 7 is a cross-sectional view of an original laser set 10, and fig. 8 is a cross-sectional view of a beam after being acted upon by an optical path turning member 20, i.e., a cross-sectional view after being condensed. As can be seen by comparison, the width of the beam of the single laser after the light path turning member 20 is unchanged, i.e. the beam performance of the laser is not changed, but the beam interval between adjacent lasers is significantly reduced.
As shown in fig. 9-10, is a beam energy profile obtained by simulation by optical simulation software. It can also be seen from the figure that the width of the individual laser beams themselves does not change, but the beam spacing of adjacent lasers is significantly reduced.
Further, the gap between the optical axes of adjacent lasers in the laser group 10 is 0.5-2 mm.
Example 2
As shown in fig. 2, this embodiment discloses a laser compression light combining system, which includes:
a first laser light source 100 for emitting a first laser beam;
a second laser light source 200 for emitting a second laser beam;
a wave plate 300 for changing the polarization direction of the first laser beam or the second laser beam to deflect by 90 ° to obtain a third laser beam;
the polarization light combining element is used for combining one of the first laser beam and the second laser beam with the third laser beam;
wherein the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, and the first laser source 100 and the second laser source 200 each comprise a laser group 10 integrally packaged by a plurality of lasers arranged in a linear or array manner;
the laser compression light combining system further comprises a light path turning piece 20 obliquely arranged on the light paths of the first laser light source 100 and the second laser light source 200, wherein the light path turning piece 20 comprises a first inclined surface 21 facing the laser set 10 and a second inclined surface 22 facing away from the laser set 10, and the second inclined surface 22 is parallel to the first inclined surface 21; wherein, the first inclined surface 21 is provided with first reflective layers 211 which are distributed at intervals, and the second inclined surface 22 is provided with a second reflective layer; the light of part of the lasers is refracted in the light path turning element 20 through the first inclined surface 21 and then reflected by the second reflecting layer, and is emitted from the gap and/or the edge of the first reflecting layer 211, the light of part of the lasers is emitted through the reflection of the first reflecting layer 211, the polarization direction of the first laser beam or the second laser beam is parallel or perpendicular to the incident plane, and the incident plane is a plane formed by the normal line of the first inclined surface 21 and the first laser beam or the second laser beam. The polarization light combining element in this embodiment is a polarization light combining prism 420, the polarization light combining prism includes a light incident surface 421, a light emergent surface 422, a first surface 423, a second surface 424, and a polarization light splitting surface 425, the light incident surface 421 and the light emergent surface 422 are disposed opposite to each other in a first direction, the first surface 423 and the second surface 424 are disposed opposite to each other in a second direction, the first direction is perpendicular to the second direction, and the polarization light splitting surface 425 is disposed inside the polarization light splitting prism 420. In this embodiment, the first direction is perpendicular to the initial exit direction of the laser set.
The difference between embodiment 2 and embodiment 1 is that the polarization beam combining element used in this embodiment is a polarization beam combining prism 420, the first laser beam of the first laser source is not deflected in the polarization beam combining prism 420, and the deflected beam of the polarization beam combining prism 420 is transmitted to the first laser beam and reflected to the second laser beam deflected by the wave plate. The first laser beam is incident on the polarization beam-combining prism 420 through the light incident surface 421, and the first laser beam is transmitted through the polarization beam-splitting surface 425 due to the transmission of the polarization beam-splitting surface 425, and finally exits through the light exit surface 422. Since the wave plate 300 is disposed between the laser set 10 of the second laser light source 200 and the optical path turning element 20, polarized laser light enters the polarization splitting prism 420, and the polarized laser light is reflected by the polarization splitting surface 425 at this time, the polarized laser light passing through the polarization splitting surface 425 is also emitted to the light emitting surface 422, and finally, the light combining effect is achieved.
Except for the difference between the polarization beam splitter 420 and embodiment 1, the other structures and working principles of this embodiment are the same as those of embodiment 1, and the other structures and working principles are not described here again.
It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and are not intended to limit the present invention to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A laser compression light combining system, comprising:
the first laser light source emits a first laser beam;
the second laser light source emits a second laser beam;
the wave plate is used for changing the polarization direction of the first laser beam or the second laser beam to deflect 90 degrees+/-k degrees to obtain a third laser beam, wherein k is more than or equal to 0 and less than or equal to 10;
the polarization light combining element is used for combining one of the first laser beam and the second laser beam with the third laser beam;
the first laser beam and the second laser beam are linearly polarized light or nearly linearly polarized light with the same initial polarization direction, and the first laser source and the second laser source comprise laser groups integrally packaged by a plurality of lasers which are arranged in a linear or array mode;
the laser compression light combining system further comprises a light path turning piece obliquely arranged on the light paths of the first laser light source and the second laser light source, wherein the light path turning piece comprises a first inclined plane facing the laser group and a second inclined plane facing away from the laser group, and the second inclined plane is arranged in parallel with the first inclined plane; the first inclined surface is provided with first reflecting layers which are distributed at intervals, and the second inclined surface is provided with a second reflecting layer; the light of part of the lasers is reflected by the second reflecting layer after being refracted in the light path turning part through the first inclined surface, and is emitted from the gap and/or the edge of the first reflecting layer, the light of part of the lasers is emitted through the first reflecting layer, the polarization direction of the first laser beam or the second laser beam is parallel or perpendicular to the incident surface, and the incident surface is a plane formed by the normal line of the first inclined surface and the first laser beam or the second laser beam.
2. The laser compression light combining system according to claim 1, wherein the polarization splitting surface of the polarization light combining element is obliquely arranged on the light paths of the first laser beam and the second laser beam; the polarization beam splitter transmits the first laser beam or the second laser beam and reflects the third laser beam, or the polarization beam splitter reflects the first laser beam or the second laser beam and transmits the third laser beam.
3. The laser compression light combining system of claim 1, wherein the laser groups of the first and second laser light sources are mounted on the same horizontal plane, and an initial emission direction of the laser groups is the same as an emission direction of the combined light beam.
4. The laser compression light combining system according to claim 3, wherein a light guide is arranged on the light path of the first laser light source, and the first laser light beam is guided to the polarization light combining element by the light guide after being condensed by the light path turning element; the wave plate is arranged on the optical path of the second laser light source and is used for changing the polarization direction of the second laser beam to deflect the second laser beam by 90 degrees+/-k degrees so as to obtain a third laser beam.
5. The laser compression light combining system according to claim 4, wherein the light guide is a reflecting mirror, and a reflecting surface of the reflecting mirror is parallel to the first inclined surface of the light path turning member on the light path of the first laser light source; the first inclined surface of the light path turning part on the light path of the second laser light source is parallel to the polarization splitting surface of the polarization combining element.
6. The laser compression light combining system of claim 5, wherein the polarization light combining element is a polarization light combining lens, an incident angle of the first laser beam to the polarization light combining lens is γ, a refraction angle is θ, and a refractive index of the polarization light combining lens is n 3 Air refractive index n 1 The thickness of the polarization light combining lens is t, and the refractive offset distance of the first laser beam in the polarization light combining lens is as follows:
k 2 is an error coefficient of 0.98.ltoreq.k 2 ≤1.02。
7. The laser compression light combining system of claim 1, wherein the polarization light combining element is a polarization light combining prism.
8. The laser compression light combining system according to any one of claims 1 to 7, wherein the light path turning member is a light transmitting optical member, and the first inclined surface and the second inclined surface are integrally formed.
9. The laser compression light combining system of any one of claims 1 to 7, wherein the laser group includes n first lasers disposed adjacently and m second lasers disposed adjacently, light of the first lasers is reflected and emitted through the first reflective layer, light of the second lasers is emitted from a gap and/or an edge of the first reflective layer, and a thickness C of the optical path turning member satisfies:
wherein A is the original distance between the optical axes of the first second laser and the first laser in the same direction; b is the optical axis distance between the first second laser and the first laser after the light of the first laser passes through the light path turning part; α is an incident angle α of the second laser to the second region; n is n 1 Refractive index n of the space environment where the laser group is located 2 The refractive index of the optical path turning part; k (k) 1 Is an error coefficient of 0.95≤k 1 ≤1.05。
10. The laser compression light combining system according to any one of claims 1 to 7, wherein an anti-reflection layer is further arranged on the first inclined surface, the anti-reflection layer is arranged avoiding the first reflection layer, the projection of the first reflection layer on the plane where the laser group is located completely covers the first laser, and the gap between the optical axes of adjacent lasers in the laser group is 0.5-2 mm.
CN202311758647.6A 2023-12-19 2023-12-19 Laser compression condensed light system Pending CN117526094A (en)

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Application Number Priority Date Filing Date Title
CN202311758647.6A CN117526094A (en) 2023-12-19 2023-12-19 Laser compression condensed light system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311758647.6A CN117526094A (en) 2023-12-19 2023-12-19 Laser compression condensed light system

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CN117526094A true CN117526094A (en) 2024-02-06

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