CN101276126A - Double Brewster's angle nonlinear optical crystal and cutting method thereof - Google Patents
Double Brewster's angle nonlinear optical crystal and cutting method thereof Download PDFInfo
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- CN101276126A CN101276126A CNA2008101046632A CN200810104663A CN101276126A CN 101276126 A CN101276126 A CN 101276126A CN A2008101046632 A CNA2008101046632 A CN A2008101046632A CN 200810104663 A CN200810104663 A CN 200810104663A CN 101276126 A CN101276126 A CN 101276126A
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Abstract
The present invention provides a dual-brewster angle nonlinear optical crystal belonging to laser technical field, and its cutting method. The dual-brewster angle nonlinear optical crystal includes an aperture entrance plane, an aperture exiting plane; the aperture entrance plane and the aperture exiting plane aim at the design of the emitting light to be transformed and the emergent light obtained by the non-linear optical transform respectively, the aperture entrance plane and the aperture existing plane process cut to the non-linear optical crystal according to the brewster angle, so as to meet incident angle as a brewster angle when the input light to be transformed emits on the light entrance plane and the exiting light produced by the non-linear transformation outputs by the light exiting plane, the aperture entrance plane and the aperture exiting plane without plating antireflection coatings ensure the incident light to be transformed pass through the entrance plane without loss, the emitting light obtained by transformation passes through the exiting end without loss, the antireflection effect of the emitting light by the exiting plane enhances anti-damaging ability of the nonlinear crystal, avoiding the loss of the nonlinear crystal.
Description
Technical field
The invention belongs to laser technology field, particularly avoid a kind of double Brewster's angle nonlinear optical crystal and the cutting method thereof of nonlinear optical crystal damage.
Background technology
The optical material that adopts in the nonlinear optical frequency conversion technology is faced with serious damage problem under the situation of long time continuous working.And in order to make laser beam losslessly by nonlinear crystal, the input face of its logical light and output face meeting plate optical anti-reflective film, but the damage of optical film situation is especially serious.Especially for the nonlinear optical crystal that produces green glow, ultraviolet light, deep UV (ultraviolet light), how effectively to prevent its surface damage, become the key of nonlinear optical frequency conversion technology.
The Ming Lai of Novatec Corporation, Shui Lai, Zhiming Ou utilizes mechanical mobile device in US5825562 " Method of continuous motion for prolong usage of optical elementsunder the irradiation of intensive laser beams ", crystal is moved continuously according to specific mode, thereby increased active area and the volume of laser to material, shortened the time of local continuously logical light, thereby reduce damage, prolong material serviceable life.
The Charles X of Coherent company, Gary Y.Wang, people such as Acle V.Hicks are in " Highpower Q-switched TEM00 mode diode-pumped solid state laser with＞30Woutput power at 355nm " (Proc.of SPIE Vol.6100 (2006)), mention the method for similarly avoiding material damage with the US5825562 kind: the device that uses automatic mobile crystal, logical optical position on the switches light input face shortened between the local continuously logical light time.
Use two kinds of above-mentioned methods, need to adopt large volume, large-area material, and need a mechanical hook-up of accurately controlling to control moving of crystal in real time, so, safeguard that in actual use the cost of this class device is very high.
The William M.Grossman of Lightwave electronics, inc., Los Altos, people such as JasonD.Henrie propose in US5850407 " Third-harmonic generator with uncoatedBrewster-cut dispersive output facet ", the exit facet of frequency tripling crystal is cut according to Brewster (Brewster) angle, thereby avoided the plating anti-reflection film, the nearly all harmless outgoing of the frequency tripling light of parallel polarization attitude and first-harmonic.But in its patent US6697391,, still adopt the mode of Brewster angle cutting to make that parallel polarized light is harmless to be passed through for the quadruple scheme, its logical optical input surface and output face be two be parallel to each other, according to the plane of Brewster angle cutting.Yet this moment, the quadruple frequency light that produced was vertical polarization for the plane of incidence of output terminal, and the output face by this no plated film has 20% reflection loss.
Summary of the invention
The objective of the invention is for fear of the problem of nonlinear optical crystal surface damage and a kind of double Brewster's angle nonlinear optical crystal and cutting method thereof are provided.It is characterized in that described double Brewster's angle nonlinear optical crystal comprises a logical optical input surface, a logical light gasing surface; The emergent light design that described logical optical input surface and logical light gasing surface obtain at the light to be converted and the nonlinear optics conversion of incident respectively, light to be converted at the plane of incidence of input end as parallel polarized light with brewster angle incidence, pass through fully to no reflection events; The emergent light that the nonlinear optics conversion obtains at the plane of incidence of output terminal as parallel polarized light with the Brewster angle outgoing, so also pass through fully to no reflection events.
The nonlinear material of the material of described nonlinear optical crystal for adopting I class phase matching mode to carry out the nonlinear optics conversion: KTP, LBO, CLBO or BBO.
The type of described nonlinear transformation comprise two kinds non-with light frequently with frequently, difference frequency, and with the frequency multiplication or the quadruple of light frequently.
The light to be converted of described incident is the linearly polarized laser of each frequency.
The light to be converted of described incident satisfies phase-matching condition in crystal, export at logical light gasing surface by the emergent light that the nonlinear optics conversion process produces.
A kind of cutting method of double Brewster's angle nonlinear optical crystal, it is characterized in that, this method is based on according to incident light and incides the logical optical input surface that cuts into by Brewster angle with this special angle of Brewster angle, this moment, reflection ray and refracted ray were orthogonal, make the harmless characteristics of passing through of parallel polarized light, promptly cut according to Brewster angle, and guarantee that this cut direction makes that incident light is a parallel polarization with respect to the plane of incidence at the light to be converted of logical optical input surface at incident; And cut according to Brewster angle, and guarantee that this cut direction makes that emergent light is a parallel polarization with respect to the plane of incidence of output terminal at the logical light gasing surface output light that conversion obtains at nonlinear optics; Concrete cutting mode is:
1) prepares a rectangular nonlinear optical crystal 1;
2) orthogonal two faces with nonlinear optical crystal 1 are benchmark, cut by Brewster angle θ respectively at the two ends of nonlinear optical crystal 1;
3) logical optical input surface is to be benchmark with the bottom surface, and line of cut 3 is Brewster angle θ with the angle of perpendicular line; Logical light gasing surface is to be benchmark with the back side, and line of cut 3 is Brewster angle θ with horizontal angle;
4) logical optical input surface and the logical light gasing surface that step 3 is obtained polished, polished by the requirement of optical lens.
Described respectively according to the logical optical input surface of Brewster angle cutting nonlinear optical crystal and two non-parallel end faces that logical light gasing surface is rectangular parallelepiped.
Described logical optical input surface and logical light gasing surface all need not to plate anti-reflection film, just can make incident light to be converted harmless passing through on input face, and the emergent light that is converted to passes through in that output terminal is harmless.
Beneficial effect of the present invention: because the logical optical input surface of nonlinear crystal and logical light gasing surface are respectively at the light to be converted of incident and the emergent light design that obtains by non-linear conversion, light to be converted at the plane of incidence of input end as parallel polarized light with brewster angle incidence, pass through fully to no reflection events; Emergent light at the plane of incidence of output terminal as parallel polarized light with the Brewster angle outgoing, so also pass through fully to no reflection events.Adopt this mode, can avoid in logical optical input surface of crystal and output face, plating anti-reflection film, thereby avoid surface damage.
Description of drawings
Fig. 1 is the synoptic diagram of crystal according to described double Brewster's angle cutting;
Fig. 2 is the three-view diagram after the crystal-cut;
Fig. 3 be one produce 355nm ultraviolet light with the synoptic diagram frequency scheme;
Fig. 4 is the device that a quadruple produces the output of 266nm laser, and wherein frequency-doubling crystal LBO and quadruple frequency crystal CLBO cut according to the double Brewster's angle mode;
Embodiment
The invention provides a kind of double Brewster's angle nonlinear optical crystal and cutting method thereof.In order to make characteristic of the present invention and advantage more clear, the present invention is described in further detail in conjunction with concrete enforcement with reference to the accompanying drawings.
Fig. 1 and Fig. 2 show the stereographic map and the planimetric map of the nonlinear optical crystal 1 of double Brewster's angle cutting respectively.Shown in Fig. 1, thick black line 3 is represented the cut place, the part 2 under the dotted line representative is cut, and θ represents Brewster angle.
Embodiment one
In Fig. 3, lbo crystal 4 is I class phase matching and frequency crystal, adopt logical optical input surface shown in Figure 1 and output face all to cut according to Brewster angle θ, its incident beam 5 is the mixed light beam of 1064nm infrared light and 532nm green glow, incide the logical optical input surface that cuts into by Brewster angle with this special angle of Brewster angle according to incident light, this moment reflection ray and the mutually perpendicular characteristics of refracted ray, this mixed light beam 5 incides logical optical input surface with Brewster angle θ, make 1064nm infrared light and 532nm green glow the polarization direction all with forward sight plane parallel (shown in Fig. 3 b), no reflection events loss ground transmission enters lbo crystal 4, I class phase matching and frequency take place, and produce the emergent light 6 of 355nm and frequency light (ultraviolet light).The new 355nm that produces is with light polarization direction is parallel with top plan view frequently, and the logical light gasing surface so that Brewster angle θ incides lbo crystal 4 still transmits to the no reflection events loss this crystal.
Embodiment two:
In the quadruple scheme synoptic diagram as shown in Figure 4, chamber mirror M1 has high reflectance, and output cavity mirror M2 reflectivity is 90%, and the two has formed resonator cavity 8.Nd-YVO4 laser crystal in the middle of M1 and the M2 is by two laser pumping source LD pumpings that produce 808nm wavelength pump light, and the incident light 5 of generation is a 1064nm wavelength infrared light.Q-Swithch represents an acousto-optic Q modulation crystal, in order to produce laser pulse.Lbo crystal 4 is an I class phase matching frequency-doubling crystal, and the 1064nm laser freuqency doubling is produced the 532nm green glow, and clbo crystal 7 is an I class phase matching frequency-doubling crystal, 532nm green glow frequency multiplication is produced the emergent light 6 of 266nm ultraviolet light.Lbo crystal 4 and clbo crystal 7 all cut according to double Brewster's angle θ.
The polarization direction of the wavelength of 1064nm shown in 4 infrared light is parallel to top plan view (shown in Fig. 4 a) among the figure, incide with Brewster angle θ on the logical optical input surface of lbo crystal 4, the no reflection events loss, all transmission enters lbo crystal 4, I class phase matching frequency multiplication takes place, and produces the green glow of 532nm.The polarization direction of the green glow of this 532nm is and forward sight parallel plane (shown in Fig. 4 b) to incide on the logical light gasing surface of lbo crystal 4 same no reflection events loss, transmission fully with Brewster angle θ.
After this 532 green glow penetrates from lbo crystal 7, incide the logical optical input surface of clbo crystal 7 again with Brewster angle θ, frequency multiplication produces the ultraviolet light of 266nm once more, the polarization direction of this ultraviolet light parallel with top plan view (shown in Fig. 4 b), incide on the logical light gasing surface of clbo crystal 7 no reflection events loss and fully transmission equally with Brewster angle θ.
Claims (8)
1. a double Brewster's angle nonlinear optical crystal is characterized in that, described double Brewster's angle nonlinear optical crystal comprises a logical optical input surface, a logical light gasing surface; The emergent light design that described logical optical input surface and logical light gasing surface obtain at the light to be converted and the nonlinear optics conversion of incident respectively, light to be converted at the plane of incidence of input end as parallel polarized light with brewster angle incidence, pass through fully to no reflection events; The emergent light that the nonlinear optics conversion obtains at the plane of incidence of output terminal as parallel polarized light with the Brewster angle outgoing, so also pass through fully to no reflection events.
2. according to the described double Brewster's angle nonlinear optical crystal of claim 1, it is characterized in that, the nonlinear material of the material of described nonlinear optical crystal for adopting I class phase matching mode to carry out the nonlinear optics conversion, nonlinear material is KTP, LBO, CLBO or BBO.
3. according to the described double Brewster's angle nonlinear optical crystal of claim 1, it is characterized in that, the type of described nonlinear optics conversion comprise two kinds non-with light frequently with frequently, difference frequency, and with the frequency multiplication or the quadruple of light frequently.
4. according to the described double Brewster's angle nonlinear optical crystal of claim 1, it is characterized in that the light to be converted of described incident is the linearly polarized laser of each frequency.
5. according to the described double Brewster's angle nonlinear optical crystal of claim 1, it is characterized in that the light to be converted of described incident satisfies phase-matching condition in crystal, export at logical light gasing surface by the emergent light that the nonlinear optics conversion obtains.
6. the cutting method of a double Brewster's angle nonlinear optical crystal, it is characterized in that, this method is based on according to incident light and incides the logical optical input surface that cuts into by Brewster angle with this special angle of Brewster angle, this moment, reflection ray and refracted ray were orthogonal, make the harmless characteristics of passing through of parallel polarized light, promptly cut according to Brewster angle, and guarantee that this cut direction makes that incident light is a parallel polarization with respect to the plane of incidence at the light to be converted of logical optical input surface at incident; And the logical light gasing surface emergent light that conversion obtains at nonlinear optics cuts according to Brewster angle, and guarantees that this cut direction makes that emergent light is a parallel polarization with respect to the plane of incidence of output terminal; Concrete cutting mode is:
1) prepares a rectangular nonlinear optical crystal (1);
2) orthogonal two faces with nonlinear optical crystal (1) are benchmark, cut by Brewster angle θ respectively at the two ends of nonlinear optical crystal (1);
3) logical optical input surface is to be benchmark with the bottom surface, and line of cut (3) is Brewster angle θ with the angle of perpendicular line; Logical light gasing surface is to be benchmark with the back side, and line of cut (3) is Brewster angle θ with horizontal angle;
4) logical optical input surface and the logical light gasing surface that step 3 is obtained polished, polished by the requirement of optical lens.
7. according to the cutting method of the described double Brewster's angle nonlinear optical crystal of claim 6, it is characterized in that, described respectively according to the logical optical input surface of Brewster angle cutting nonlinear optical crystal and two non-parallel end faces that logical light gasing surface is rectangular parallelepiped.
8. according to the cutting method of the described double Brewster's angle nonlinear optical crystal of claim 6, it is characterized in that, described logical optical input surface and logical light gasing surface all need not to plate anti-reflection film, just can make incident light to be converted harmless passing through on input face, and the emergent light that is converted to passes through in that output terminal is harmless.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074886A (en) * | 2010-12-15 | 2011-05-25 | 厦门大学 | Crystal orientation selected polarization state controllable microchip laser |
| CN102522680A (en) * | 2011-12-23 | 2012-06-27 | 中国科学院光电研究院 | Method for designing Brewster window |
| CN104357648A (en) * | 2014-10-13 | 2015-02-18 | 中国航空工业集团公司北京航空制造工程研究所 | Laser shock peening method and device |
| CN106553106A (en) * | 2016-10-28 | 2017-04-05 | 江苏师范大学 | A kind of method of processing microminiature Laser Devices Brewster angle |
| CN108565666A (en) * | 2018-04-18 | 2018-09-21 | 苏州四海常晶光电材料有限公司 | Nd is processed using Brewster's angle:The method of YAG laser crystal |
| CN108666857A (en) * | 2018-04-18 | 2018-10-16 | 苏州四海常晶光电材料有限公司 | Cr is processed using Brewster's angle4+:The method of YAG crystal |
| CN108908766A (en) * | 2018-07-16 | 2018-11-30 | 苏州四海常晶光电材料有限公司 | It is a kind of that Nd is processed using Brewster's angle:The method of YAP laser crystal |
| CN109445228A (en) * | 2019-01-10 | 2019-03-08 | 北京信息科技大学 | A kind of double-colored same-phase femtosecond infrared laser Wavelength converter |
| CN111636099A (en) * | 2020-05-29 | 2020-09-08 | 福建科彤光电技术有限公司 | Method for preventing non-linear crystal from deliquescence |
-
2008
- 2008-04-23 CN CNA2008101046632A patent/CN101276126A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074886A (en) * | 2010-12-15 | 2011-05-25 | 厦门大学 | Crystal orientation selected polarization state controllable microchip laser |
| CN102522680A (en) * | 2011-12-23 | 2012-06-27 | 中国科学院光电研究院 | Method for designing Brewster window |
| CN104357648A (en) * | 2014-10-13 | 2015-02-18 | 中国航空工业集团公司北京航空制造工程研究所 | Laser shock peening method and device |
| CN104357648B (en) * | 2014-10-13 | 2017-04-05 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of laser shock peening method and device |
| CN106553106A (en) * | 2016-10-28 | 2017-04-05 | 江苏师范大学 | A kind of method of processing microminiature Laser Devices Brewster angle |
| CN106553106B (en) * | 2016-10-28 | 2019-01-11 | 江苏师范大学 | A method of processing microminiature laser device Brewster angle |
| CN108565666A (en) * | 2018-04-18 | 2018-09-21 | 苏州四海常晶光电材料有限公司 | Nd is processed using Brewster's angle:The method of YAG laser crystal |
| CN108666857A (en) * | 2018-04-18 | 2018-10-16 | 苏州四海常晶光电材料有限公司 | Cr is processed using Brewster's angle4+:The method of YAG crystal |
| CN108908766A (en) * | 2018-07-16 | 2018-11-30 | 苏州四海常晶光电材料有限公司 | It is a kind of that Nd is processed using Brewster's angle:The method of YAP laser crystal |
| CN109445228A (en) * | 2019-01-10 | 2019-03-08 | 北京信息科技大学 | A kind of double-colored same-phase femtosecond infrared laser Wavelength converter |
| CN109445228B (en) * | 2019-01-10 | 2022-04-26 | 北京信息科技大学 | Double-color same-phase femtosecond infrared laser wavelength conversion device |
| CN111636099A (en) * | 2020-05-29 | 2020-09-08 | 福建科彤光电技术有限公司 | Method for preventing non-linear crystal from deliquescence |
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