CN213692642U - Double-light-path beam-combining laser - Google Patents
Double-light-path beam-combining laser Download PDFInfo
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- CN213692642U CN213692642U CN202020935673.7U CN202020935673U CN213692642U CN 213692642 U CN213692642 U CN 213692642U CN 202020935673 U CN202020935673 U CN 202020935673U CN 213692642 U CN213692642 U CN 213692642U
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Abstract
The utility model discloses a double-light-path beam-combining laser, which comprises a lambda/2 wave plate, a reflector, a beam-combining plate and at least two laser monomers; the first laser unit comprises a pumping source I, a coupling system I and a crystal I, the second laser unit comprises a pumping source II, a coupling system II and a crystal II, and the polarization directions of the light paths of the crystal I and the crystal II are the same or are orthogonal; if the polarization directions of the first and second light paths are the same, a beam combining plate is arranged on the first output light path, and a lambda/2 wave plate and a reflector are arranged on the second output light path, so that the second light is input into the beam combining plate and output in the same beam with the first light; if the polarization directions of the light paths of the crystal I and the crystal II are orthogonal, a beam combining sheet is arranged on the first output light path, and a reflector is arranged on the second output light path, so that the second light is input into the beam combining sheet and output in the same beam with the first light. Two laser beams with the same energy and orthogonal polarization directions are combined through a beam combining sheet to realize the high-power laser output of the same optical path.
Description
Technical Field
The utility model relates to a solid laser technical field, more specifically say, relate to a two optical paths close a beam laser.
Background
With the rapid development of lasers, the applications of the lasers are more and more, and the output of the lasers with high power is more and more required. In the traditional laser, the laser power is improved, and basically, pumping coupling of a plurality of beams of laser is realized or carried out by improving the pumping power; however, the conversion efficiency of the conventional lamp pump laser is only about 3%, most of the energy emitted by the pump lamp is converted into heat energy, so that a single laser is subjected to high-power laser output by increasing the pump power, a serious thermal lens effect is generated, crystals are easily cracked, and the material utilization rate, the yield and the working efficiency of laser application are affected; the multiple lasers are coupled in a pumping mode, the laser power and the beam quality are greatly reduced due to the fact that a large amount of heat is generated in the laser modules, complex heat management technology and beam quality control technology are needed to achieve high-beam-quality and high-power laser output, the light path structure is complex, the cost is high, the performance of any laser module in the laser system affects the performance of the whole laser system, and the overall stability is reduced.
Therefore, how to avoid the above problems and realize high power laser output in the same optical path is a problem that needs to be solved by those skilled in the pump art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two light paths close a bundle laser instrument, with the laser that two bundles of beams sent through the different laser instrument of pumping respectively, close the back through closing the bundle piece and export, realize with the high-power laser output of light path to have high power, the wide characteristics of super temperature.
In order to achieve the above object, the present invention provides a dual optical path beam combining laser, which comprises a λ/2 wave plate, a reflective mirror, a beam combining plate and at least two laser units; the first laser unit comprises a pumping source I, a coupling system I and a crystal I, the second laser unit comprises a pumping source II, a coupling system II and a crystal II, and the polarization directions of the light paths of the crystal I and the crystal II are the same or are orthogonal; if the polarization directions of the light paths of the crystal I and the crystal II are the same, the beam combining plate is arranged on the output light path of the first crystal, and the lambda/2 wave plate and the reflector are arranged on the output light path of the second crystal, so that the light of the second crystal is input into the beam combining plate and output in the same beam with the light of the first crystal; if the polarization directions of the light paths of the crystal I and the crystal II are orthogonal, the beam combining sheet is arranged on the output light path of the first crystal, and the reflector is arranged on the output light path of the second crystal, so that the light of the second crystal is input into the beam combining sheet and output in the same beam with the light of the first crystal.
Preferably, the mirror is provided as a 45 degree mirror.
Preferably, the crystal I and the crystal II are both provided as self-frequency doubling crystals.
Preferably, the beam combining plate is arranged as a polarization beam splitting prism.
Preferably, the pump source I and the pump source II are both provided as near-infrared pump sources.
Preferably, an optical fiber is arranged downstream of the beam combining sheet in the beam output direction.
Preferably, the matrix material of the self-frequency doubling crystal is provided as gadolinium calcium oxytetraborate or yttrium calcium oxytetraborate.
Preferably, the particles doped in the self-frequency doubling crystal are neodymium or ytterbium.
Preferably, the incident surface of the self-frequency doubling crystal is provided with a first coating, the exit surface of the self-frequency doubling crystal is provided with a second coating, the first coating has high transmittance for the pump light, high reflectivity for the fundamental light and high reflectivity for the frequency doubling light, and the second coating has high reflectivity for the pump light and the fundamental light and high transmissivity for the frequency doubling light.
The utility model provides an among the technical scheme, the laser that jets out two laser monomers passes through the reflector and closes the piece and close and restraint the realization and export with two light paths, with among the prior art through improving pumping power or compare multi-beam laser pumping coupling, avoided the setting to pumping, reduce the heat, and simple structure, with low costs, easy production to high power output has been realized, the wide use of super temperature has improved the yield of laser instrument, the material rate of utilization and the work efficiency when using.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-beam combined laser according to an embodiment of the present invention.
In fig. 1:
1. a pump source I; 2. a pumping source II; 3. a coupling system I; 4. a coupling system II; 5. a crystal I; 6. a crystal II; 7. a lambda/2 wave plate; 8. a reflective mirror; 9. and (4) combining the sheets.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The purpose of this specific embodiment is to provide a dual optical path beam combining laser, which combines two beams of laser emitted from different lasers respectively passing through a pump and outputs the combined beam through a beam combining sheet, so as to implement high-power laser output in the same optical path, and has the characteristics of high power and over-temperature width.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.
Referring to fig. 1, the dual optical path beam combining laser provided in this embodiment includes a λ/2 wave plate 7, a reflective mirror 8, a beam combining plate 9, and at least two laser monomers; first laser instrument monomer includes pump source I, coupled system I3 and crystal I5, pump source I specifically can set up to near-infrared pump source I1, near-infrared pump source I1 sends near-infrared light, focus on crystal I5 through coupled system I3, laser is sent out after I5 absorbs of crystal, second laser instrument monomer includes pump source II, coupled system II 4 and crystal II 6, pump source II can specifically set up to near-infrared pump source II 2, near-infrared pump source II 2 sends near-infrared light, focus on crystal II 6 through coupled system II 4, laser is sent out after II 6 absorbs of crystal.
From the output direction of the laser, the polarization directions of the two laser beams emitted by the crystal i 5 and the crystal ii 6 may be the same or orthogonal, that is, one is horizontally polarized light and the other is vertically polarized light.
If the polarization directions of the light paths of the crystal I5 and the crystal II 6 are the same, if two laser monomers are arranged in the same direction side by side, a beam combining plate 9 is arranged on the output light path of the first laser monomer, and a lambda/2 wave plate 7 and a reflective mirror 8 are arranged on the output light path of the second laser monomer, the light path of the first laser monomer (the crystal I5 or the crystal II 6) horizontally enters the beam combining plate 9, the lambda/2 wave plate 7 is arranged at the front end of the output surface of the second laser monomer (the crystal II 6 or the crystal I5), so that the polarization state of the vertical polarization light output by the second laser monomer is changed to be in the horizontal component direction, then the vertical polarization light enters the reflective mirror 8 to change the polarization direction again, specifically, the reflective mirror 8 is arranged as a 45-degree reflective mirror, and finally the vertical. The polarization direction of the light path is changed through the lambda/2 wave plate 7 and the reflector 8, so that the two lasers with the same light path are combined on the same beam combining plate 9, then the lasers are output in the same direction of the light path, the energy is superposed, the power of the lasers output by the beam combining plate 9 is increased, and the high-power and super-temperature-width laser output is realized.
If the polarization directions of the light paths of the crystal I5 and the crystal II 6 are orthogonal, the two laser monomers are vertically arranged, wherein a beam combining sheet 9 is arranged on the polarized light output light path of the first laser monomer, and a reflective mirror 8 is arranged on the polarized light output light path of the second laser monomer, specifically, the reflective mirror 8 is a 45-degree reflective mirror, so that the light paths of the second laser monomer are input into the beam combining sheet 9 and output in the same beam with the light path of the first laser monomer.
Due to the arrangement, two beams of laser emitted by different lasers in different light paths can be combined only through the lambda/2 wave plate 7, the reflector 8 and the beam combining plate 9, high-power output of the same light path is realized in a parallel connection mode, and the structure is simple and wonderful; compared with the prior art that the pump power is improved or the multiple laser beams are coupled, the pump is avoided, the increase of the heat emitted is avoided, the structure is simple, the cost is low, the production is easy, the high-power output is realized, the over-temperature and wide-range use is realized, and the yield, the material utilization rate and the working efficiency during application of the laser are improved.
The laser beams output by the two laser monomers can be shaped before being combined. In this embodiment, an optical fiber is provided downstream of the beam combining piece 9 in the beam output direction. After the two laser beams are combined, the output combined beam is reshaped through the optical fiber, and the reshaping effect of uniform beams can be achieved.
The beam combining plate 9 may be a polarization splitting prism according to polarization characteristics of the laser light emitted from the two laser monomers.
Specifically, the crystal i 5 may be configured as a self-frequency doubling crystal; or the crystal I5 and the crystal II 6 are both set as self-frequency doubling crystals. Thus, the two beams of laser with different light paths are frequency doubling light; two beams of laser with different optical paths output by pumping and frequency doubling are superposed and combined after passing through uniform optical paths, and then are focused and transmitted for use, so that the power is high, the laser is stable, and the super-temperature wide use can be realized.
Specifically, the self-frequency doubling crystal may be provided as a gadolinium calcium oxytrichloride (gdcoob) crystal or a Yttrium Calcium Oxytrichloride (YCOB) crystal. And the particles doped in the self-frequency doubling crystal can be neodymium (Nd) or ytterbium (Yb).
Coating films are arranged on the incident surface and the emergent surface of the self-frequency doubling crystal, first coating films are arranged on the incident surfaces of the crystal I5 and the crystal II 6, the outer surface of each first coating film has high transmittance for pump light, and the inner surface of each first coating film has high reflectivity for fundamental frequency light and frequency doubling light; and the emergent surfaces of the crystal I5 and the crystal II 6 are respectively provided with a second coating, the inner surface of the second coating has high reflectivity for pump light and base frequency light, and the outer surface of the second coating has high transmissivity for frequency doubling light. The pump light is efficiently emitted into the self-frequency doubling crystal through the high transmission of the first coating film on the incident surface, so that the two self-frequency doubling crystals generate the fundamental frequency light, the fundamental frequency light is subjected to the high reflection of the first coating film and the second coating film, is constrained in the self-frequency doubling crystal, and forms a resonant cavity in the self-frequency doubling crystal to generate the frequency doubling light, and the frequency doubling light is subjected to the high reflection of the first coating film on the incident surface and the high transmission of the second coating film on the emergent surface, is emitted out from the emergent surface in a concentrated manner, so that the quality of the emitted light beam is improved, and the light loss is reduced.
The coating of the film on the surface of the crystal for highly reflecting or highly transmitting the pump light, the fundamental frequency light and the frequency doubling light is a mature prior art, and here, only the coating with corresponding performance is applied to which end face of the crystal for position limitation and application, and the specific compositions of the first coating and the second coating are the prior art already disclosed in the field, and are not described herein again.
The following description of the arrangement of the dual optical path beam combining laser is given in specific embodiments:
embodiment 1: the near infrared pump source I1 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal I5 through the coupling system I3, the self-frequency doubling crystal I5 absorbs the near infrared light and then vibrates to emit frequency doubling light, and the beam combining sheet 9 is placed on the light path of the crystal I5; the near infrared pump source II 2 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal II 6 through the coupling system II 4, the self-frequency doubling crystal II 6 absorbs the near infrared light and starts to vibrate to emit frequency doubling light, and the polarization directions of the frequency doubling light emitted by the self-frequency doubling crystal I5 and the frequency doubling light emitted by the self-frequency doubling crystal II 6 are the same; a lambda/2 wave plate 7 is arranged above the self-frequency doubling crystal II 6, the polarization directions of the two beams of light are adjusted to be orthogonal, a 45-degree reflector 8 is arranged on the light path, the laser is made to enter a beam combining plate 9 through the reflector 8, and the two beams of laser are combined.
Embodiment 2: the near infrared pump source II 2 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal II 6 through the coupling system II 4, the self-frequency doubling crystal II 6 is absorbed and then starts to vibrate to emit frequency doubling light, and the beam combining sheet 9 is placed on a light path; the near infrared pump source I1 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal I5 through the coupling system I3, the self-frequency doubling crystal I5 absorbs the near infrared light and then vibrates to emit frequency doubling light, and the polarization directions of the frequency doubling light emitted by the self-frequency doubling crystal I5 and the frequency doubling light emitted by the self-frequency doubling crystal II 6 are the same; a lambda/2 wave plate 7 is arranged above the self-frequency doubling crystal II 5, the polarization directions of the two beams of light are adjusted to be orthogonal, a 45-degree reflector 8 is arranged on the light path, the laser is made to enter a beam combining plate 9 through the reflector 8, and the two beams of laser are combined.
Embodiment 3: the near infrared pump source I1 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal I5 through the coupling system I3, the self-frequency doubling crystal I5 absorbs the near infrared light and then vibrates to emit frequency doubling light, and the beam combining sheet 9 is placed on a light path; the near infrared pump source II 2 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal II 6 through the coupling system II 4, the self-frequency doubling crystal II 6 absorbs the near infrared light and vibrates to emit frequency doubling light, and the polarization directions of the frequency doubling light emitted by the self-frequency doubling crystal I5 and the frequency doubling light emitted by the self-frequency doubling crystal II 6 are orthogonal; a45-degree reflector 8 is arranged right above the light path, so that the laser is shot into a beam combining sheet 9 to combine two beams of laser.
Embodiment 4: the near infrared pump source II 2 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal II 6 through the coupling system II 4, the self-frequency doubling crystal II 6 absorbs the near infrared light and then vibrates to emit frequency doubling light, and the beam combining sheet 9 is placed on the light path; the near infrared pump source I1 emits near infrared light, the near infrared light is focused to the self-frequency doubling crystal I5 through the coupling system I3, the self-frequency doubling crystal I5 absorbs the near infrared light and vibrates to emit frequency doubling light, and the polarization directions of the frequency doubling light emitted by the self-frequency doubling crystal I5 and the frequency doubling light emitted by the self-frequency doubling crystal II 6 are orthogonal; a45-degree reflector 8 is arranged right above the light path, so that the laser is shot into a beam combining sheet 9 to combine two beams of laser.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The utility model provides a plurality of schemes contain the basic scheme of itself, mutual independence to restrict each other, but it also can combine each other under the condition of not conflicting, reaches a plurality of effects and realizes jointly.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention is not to be limited to the embodiments shown herein,
but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A double-optical-path beam combination laser is characterized by comprising a lambda/2 wave plate (7), a reflector (8), a beam combination plate (9) and at least two laser monomers; the first laser monomer comprises a pumping source I (1), a coupling system I (3) and a crystal I (5), the second laser monomer comprises a pumping source II (2), a coupling system II (4) and a crystal II (6), and the polarization directions of the light paths of the crystal I (5) and the crystal II (6) are the same or are orthogonal;
if the polarization directions of the light paths of the crystal I (5) and the crystal II (6) are the same, the beam combining plate (9) is arranged on the output light path of the first crystal, and the lambda/2 wave plate (7) and the reflective mirror (8) are arranged on the output light path of the second crystal, so that the light of the second crystal is input into the beam combining plate (9) and output in the same beam with the light of the first crystal;
if the polarization directions of the light paths of the crystal I (5) and the crystal II (6) are orthogonal, the beam combining sheet (9) is arranged on the output light path of the first one, and the reflector (8) is arranged on the output light path of the second one, so that the light of the second one is input into the beam combining sheet (9) and output in the same beam with the light of the first one.
2. A dual beam combining laser as claimed in claim 1 wherein the mirror (8) is arranged as a 45 degree mirror.
3. The dual beam combining laser of claim 1, wherein an optical fiber is disposed downstream of the combining sheet in a beam output direction.
4. A dual optical path combining laser as claimed in claim 1, wherein the crystal i (5) is configured as a self-doubling crystal.
5. The dual optical path combining laser as claimed in claim 1, wherein the crystal i (5) and the crystal ii (6) are each configured as a self-doubling crystal.
6. A dual beam combining laser as claimed in claim 1, wherein the combining plate (9) is provided as a polarizing beam splitter prism.
7. The dual optical path combining laser as claimed in claim 1, wherein the pump source i and the pump source ii are both configured as near infrared pump sources.
8. The dual optical path combining laser of claim 5, wherein the host material of the self frequency doubling crystal is gadolinium calcium oxide triborate or yttrium calcium oxide triborate.
9. The dual optical path combining laser as claimed in claim 5, wherein the self frequency doubling crystal has a first coating film on the incident surface and a second coating film on the exit surface, the first coating film has high transmittance for the pump light and high reflectance for the fundamental light and the frequency doubling light, and the second coating film has high reflectance for the pump light and the fundamental light and high transmittance for the frequency doubling light.
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| CN202020935673.7U CN213692642U (en) | 2020-05-28 | 2020-05-28 | Double-light-path beam-combining laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725710A (en) * | 2021-07-22 | 2021-11-30 | 北京工业大学 | Orthogonal polarization and pulse width adjustable laser |
| CN117381212A (en) * | 2023-11-23 | 2024-01-12 | 江阴创可激光技术有限公司 | Laser processing device for emitting light of double lasers |
-
2020
- 2020-05-28 CN CN202020935673.7U patent/CN213692642U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725710A (en) * | 2021-07-22 | 2021-11-30 | 北京工业大学 | Orthogonal polarization and pulse width adjustable laser |
| CN117381212A (en) * | 2023-11-23 | 2024-01-12 | 江阴创可激光技术有限公司 | Laser processing device for emitting light of double lasers |
| CN117381212B (en) * | 2023-11-23 | 2024-05-10 | 江阴创可激光技术有限公司 | Laser processing device for emitting light of double lasers |
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