CN1395132A - Non-linear frequency changeover crystal - Google Patents
Non-linear frequency changeover crystal Download PDFInfo
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- CN1395132A CN1395132A CN 02112187 CN02112187A CN1395132A CN 1395132 A CN1395132 A CN 1395132A CN 02112187 CN02112187 CN 02112187 CN 02112187 A CN02112187 A CN 02112187A CN 1395132 A CN1395132 A CN 1395132A
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Abstract
The crystal for converting non-linear frequency includes 2-3 optical elements among the following 4 optical elements: the non-linear crystal (1), the non-linear crystal (2), 1/2 wave plate and the dual wavelength wave plate. The non-linear crystal (1) and the non-linear crystal (2) are the non-linear crystals KTP with same lengths and cut along the dirction according to the II class phase match. The anti-reflection film @1064nm or @1064nm &523nm are coated on the surfaces of the optical elements. N pieces of the said crystals through the optical cement or the deepened optical cement forms the crystal pile for non-linear frequency conversion, where the N is a integer. The invention can compensate the stray from or the phase difference of the optical wave, and can be used as the double frequency crystal.
Description
Technical field
The present invention relates to a kind of non-linear frequency conversion crystal, belong to the light wavelength conversion device technical field.
Background technology
Under critical phase-matching condition, because the influence of following factor has limited the raising of nonlinear crystal frequency conversion efficiency.
At first, fundamental frequency light is divided into two orthogonal polarization components incide the nonlinear crystal with birefringence effect with certain polarization direction after, because the refractive index that different polarized components is corresponding different, at the inner phase mismatch that takes place of nonlinear crystal, promptly when fundamental frequency light during from the nonlinear crystal outgoing two polarized components one phase difference is arranged
Δ=(n
2 ω-n
1 ω) L2 π/λ wherein, λ is the fundamental frequency light wavelength, L is the effective length of nonlinear crystal, n
1 ω, n
2 ωBe respectively the refractive index of two polarized component correspondences.Polarization direction when phase difference makes the outgoing of fundamental frequency light changes, and causes the angle of fundamental frequency polarisation of light direction and nonlinear crystal optical axis to change, and this will inevitably cause the fluctuation of nonlinear crystal frequency conversion efficiency.
Secondly, in nonlinear crystal, because the birefringence effect of light wave, in general, the phase place direction of propagation of light wave and can spread that to broadcast direction be inconsistent.Angle α between wave vector and the Poynting vector is called the deviation angle of light wave.The light wave of walking interaction in making crystal of light wave is separated from each other after through a segment distance, thereby has reduced interaction length, has reduced the frequency conversion efficiency of nonlinear crystal.
In the background technology, developed the multiple method that under critical phase-matching condition, improves the nonlinear crystal frequency conversion efficiency.United States Patent (USP) the 4th, 913 controls control phase difference Δ by nonlinear crystal being carried out temperature No. 533, but this method can not compensate light wave spatially walk from, very high to temperature requirements, and this device is very sensitive to the variation of surrounding environment.Japanese unexamined patent Nos.1 (1989)-152781 uses the nonlinear crystal with trapezoid cross section, changes the light path of light wave by nonlinear crystal by moving up and down trapezoidal nonlinear crystal, realizes the adjusting to phase difference.But this method can not compensate light wave the space walk from, and to the requirement on machining accuracy height of crystal, also very sensitive to the variation of surrounding environment.Authorized people's such as Yoji Okazaki United States Patent (USP) the 5th on July 29th, 1997,652, disclose the non-linear frequency conversion crystal of another kind of structure for No. 757, the optical axis direction that is about to the nonlinear crystal of the same race of two equal length, identical cutting angle is placed along logical optical axis half-twist.This non-linear frequency conversion crystal not only can compensate the phase differential that fundamental frequency light causes through nonlinear crystal, and ambient temperature is changed insensitive, but can't compensate light wave spatially walk from.March nineteen ninety-five, people such as Gao Jiangrui publish an article on AppliedOptics, the nonlinear crystal of the same race of having introduced two equal length of employing, identical cutting angle in the laser instrument of intracavity frequency doubling is as frequency-doubling crystal, wherein, second nonlinear crystal optical axis direction with respect to first nonlinear crystal optical axis direction along logical optical axis Rotate 180 ° placement.This non-linear frequency conversion crystal not only can compensate light wave the space walk from, and ambient temperature is changed insensitive, but this non-linear frequency conversion crystal can't compensate the phase differential that fundamental frequency light causes through nonlinear crystal.
Summary of the invention
The technical problem to be solved in the present invention is to release a kind of non-linear frequency conversion crystal, this non-linear frequency conversion crystal can compensate light wave walking from passing through the phase mismatch that nonlinear crystal causes with fundamental frequency light in the space simultaneously, make the nonlinear crystal frequency conversion efficiency reach maximum, and for any wave band all is full-wave plate, simultaneously, this non-linear frequency conversion crystal changes insensitive to ambient temperature, need not the serviceability temperature control system, simple in structure, volume is small and exquisite.
The present invention makes above-mentioned technical matters be resolved by following technical solution: a kind of non-linear frequency conversion crystal, contain following four kinds of optical elements: in nonlinear crystal 1, nonlinear crystal 2,1/2nd wave plates 5 and the dual wavelength wave plate 6 two～three kinds, it is characterized in that, nonlinear crystal 1 is the identical nonlinear crystal KTP of length with nonlinear crystal 2, press the cutting of II class phase matching direction, the surperficial 1a of nonlinear crystal 1 is coated with Zeng Toumo @1064nm, and surperficial 1b is coated with Zeng Toumo @1064nm﹠amp; 532nm, two surfaces of nonlinear crystal 2,1/2nd wave plates 5 and dual wavelength wave plate 6 all are coated with anti-reflection film; 532nm, this non-linear frequency conversion crystal has one of following four kinds of unitized constructions: (1) non-linear frequency conversion crystal 10 closely is adjacent to arrange place by nonlinear crystal 1 and three blocks of nonlinear crystals 2 and forms, the optical axis direction of first block of nonlinear crystal 2 with respect to the optical axis direction of nonlinear crystal 1 along logical optical axis Rotate 180 ° placement, the optical axis direction of second block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of first block of nonlinear crystal 2, the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of second block of nonlinear crystal 2 along logical optical axis Rotate 180 ° placement; (2) non-linear frequency conversion crystal 11 closely is adjacent to arrange place by nonlinear crystal 1 and three blocks of nonlinear crystals 2 and forms, the optical axis direction of first block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of nonlinear crystal 1, along logical optical axis Rotate 180 ° placement, place along logical optical axis half-twist with respect to the optical axis direction of second block of nonlinear crystal 2 by the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of first block of nonlinear crystal 2 for the optical axis direction of second block of nonlinear crystal 2; (3) non-linear frequency conversion crystal 12 closely is adjacent to arrange place by nonlinear crystal 1,1/2nd wave plates 5 and nonlinear crystal 2 and forms, nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and 1/2nd wave plates 5 are placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45; (4) non-linear frequency conversion crystal 13 closely is adjacent to arrange place by nonlinear crystal 1, dual wavelength wave plate 6 and nonlinear crystal 2 and forms, nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and dual wavelength wave plate 6 is placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45.
Principle of work:
(1) non-linear frequency conversion crystal 10:
Ktp crystal is a biaxial crystal, and nonlinear crystal 1,2 is along the YZ plane cutting around Z axle rotation Φ, and Φ is 23.5 °.As shown in Figure 1, frequency be the fundamental frequency light of 1064nm with perpendicular to the Z axle, the direction that becomes phase matching angle Φ with X-axis by non-linear frequency conversion crystal 10 after, change the frequency doubled light that frequency is 532nm into.In frequency conversion, fundamental frequency light passes through nonlinear crystal 1, first block of nonlinear crystal 2, second block of nonlinear crystal 2, the 3rd block of nonlinear crystal 2 successively.When fundamental frequency light process nonlinear crystal 1, fundamental frequency light is divided into the polarization mode of two orthogonal directionss: the polarization direction is perpendicular to the basic mode e on the XY plane of nonlinear crystal 1
1Be parallel to the basic mode e on the XY plane of nonlinear crystal 1 with the polarization direction
2In the XY plane of nonlinear crystal 1, basic mode e
1In nonlinear crystal 1, propagate basic mode e along logical optical axis direction
2Downward bias is propagated from logical optical axis direction, with basic mode e
1Walk from.When fundamental frequency light during from nonlinear crystal 1 outgoing, basic mode e
2With basic mode e
1The phase differential that produces is
Wherein,
Be basic mode e
2Refractive index in nonlinear crystal 1,
Be basic mode e
1Refractive index in nonlinear crystal 1, L is the length of nonlinear crystal 1, λ is the fundamental frequency light wavelength.Then, fundamental frequency light incides on first block of nonlinear crystal 2 and since the optical axis direction of first block of nonlinear crystal 2 with respect to the optical axis direction of nonlinear crystal 1 along logical optical axis Rotate 180 ° placement, basic mode e
1The polarization direction continues to propagate basic mode e along logical optical axis direction perpendicular to its XY plane in first block of nonlinear crystal 2
2The polarization direction is parallel to its XY plane in first block of nonlinear crystal 2, and will in its XY plane, upwards depart from logical optical axis direction and propagate, because the length of first block of nonlinear crystal 2 is identical with the length of nonlinear crystal 1, basic mode e
2In first block of nonlinear crystal 2, make progress walk from just in time can compensate it in nonlinear crystal 1 downward walk from, make basic mode e
2When arriving the another side of first block of nonlinear crystal 2 can with basic mode e
1In the same point outgoing.Basic mode e
2With basic mode e
1The phase differential that produces in first block of nonlinear crystal 2 is
Then, fundamental frequency light incides on second block of nonlinear crystal 2, because the optical axis direction of second block of nonlinear crystal 2 is placed basic mode e with respect to the optical axis direction of first block of nonlinear crystal 2 along logical optical axis half-twist
2Basic mode e is propagated perpendicular to its XY plane in the polarization direction along logical optical axis direction in second block of nonlinear crystal 2
1The polarization direction is parallel to its XY plane in second block of nonlinear crystal 2, will propagate from logical optical axis direction to left avertence in its XY plane, with basic mode e
2Walk from.Basic mode e
2With basic mode e
1The phase differential that produces in second block of nonlinear crystal 2 is
At last, fundamental frequency light incides on the 3rd block of nonlinear crystal 2 and since the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of second block of nonlinear crystal 2 along logical optical axis Rotate 180 ° placement, basic mode e
2The polarization direction continues to propagate basic mode e along logical optical axis direction perpendicular to its XY plane in the 3rd block of nonlinear crystal 2
1The polarization direction is parallel to its XY plane in the 3rd block of nonlinear crystal 2, will in its XY plane, propagate from logical optical axis direction to right avertence, because the length of the 3rd block of nonlinear crystal 2 is identical with the length of second block of nonlinear crystal 2, and basic mode e
1In the 3rd block of nonlinear crystal 2 to the right walk from just in time can compensate it in second block of nonlinear crystal 2 left walk from, make basic mode e
1When arriving the another side of the 3rd block of nonlinear crystal 2 can with basic mode e
2In the same point outgoing.Basic mode e
2With basic mode e
1The phase differential that produces in the 3rd block of nonlinear crystal 2 is
Among formula (a) and (b), (c), (d)
Portion is the refractive index of polarization direction perpendicular to the polarized component on nonlinear crystal XY plane,
The refractive index that all is parallel to the polarized component on nonlinear crystal XY plane for the polarization direction, so
With
With
Equate respectively, so fundamental frequency light is zero (being Δ 1+ Δ 2+ Δ 3+ Δ 4=0) through nonlinear crystal 1, first block of nonlinear crystal 2, second block of nonlinear crystal 2, the 3rd total phase differential in nonlinear crystal 2 backs successively.Hence one can see that, by nonlinear crystal 1 and three blocks of nonlinear crystals 2 closely be adjacent to arrange place the non-linear frequency conversion crystal 10 that forms not only can compensate light wave spatially walk from, and can compensate the phase differential that fundamental frequency light causes through non-linear frequency conversion crystal 10.
(2) non-linear frequency conversion crystal 11:
As shown in Figure 2, the principle of work and the non-linear frequency of non-linear frequency conversion crystal 11 are changed the roughly the same of crystal 10, repeat no more here.
(3) non-linear frequency conversion crystal 12:
As shown in Figure 3, in the frequency conversion, fundamental frequency light passes through nonlinear crystal 1,1/2nd wave plates 5 and nonlinear crystal 2 successively.When fundamental frequency light process nonlinear crystal 1, fundamental frequency light is divided into the polarization mode of two orthogonal directionss: the polarization direction is perpendicular to the basic mode e on the XY plane of nonlinear crystal 1
1Be parallel to the basic mode e on the XY plane of nonlinear crystal 1 with the polarization direction
2In the XY plane of nonlinear crystal 1, basic mode e
1In nonlinear crystal 1, propagate basic mode e along logical optical axis direction
2Downward bias is propagated from logical optical axis direction, with basic mode e
1Walk from.When fundamental frequency light during from nonlinear crystal 1 outgoing, basic mode e
2With basic mode e
1The phase differential that produces is
Then, fundamental frequency light incides on 1/2nd wave plates 5, since the optical axis direction of 1/2nd wave plates 5 and the optical axis direction angle at 45 of nonlinear crystal 1, the basic mode e in nonlinear crystal 1
1, behind 1/2nd wave plates 5, the polarization direction becomes the XY plane that is parallel to nonlinear crystal 1,2, enter nonlinear crystal 2 after, downward bias is propagated the basic mode e in nonlinear crystal 1 from logical optical axis direction
2, behind 1/2nd wave plates 5, the polarization direction becomes the XY plane perpendicular to nonlinear crystal 1,2, enter nonlinear crystal 2 after, will propagate along logical optical axis direction.Because the length of nonlinear crystal 2 is identical with the length of nonlinear crystal 1, basic mode e
1Downward walking in nonlinear crystal 2 from just in time compensating basic mode e
2In nonlinear crystal 1 downward walk from, make basic mode e
2When arriving the another side of nonlinear crystal 2 can with basic mode e
1In the same point outgoing.Basic mode e
2With basic mode e
1The phase differential that produces in nonlinear crystal 2 is
Among formula (e), (f)
All be the refractive index of polarization direction perpendicular to the polarized component on nonlinear crystal XY plane,
The refractive index that all is parallel to the polarized component on nonlinear crystal XY plane for the polarization direction, so
So fundamental frequency light is zero (being Δ 1+ Δ 2=0) through nonlinear crystal 1, the total phase differential in nonlinear crystal 2 backs successively.Hence one can see that, by nonlinear crystal 1,1/2nd wave plates 5 and nonlinear crystal 2 closely be adjacent to arrange place the non-linear frequency conversion crystal 12 that forms not only can compensate light wave spatially walk from, and can compensate the phase differential that fundamental frequency light causes through non-linear frequency conversion crystal 12.
(4) non-linear frequency conversion crystal 13:
As shown in Figure 4, non-linear frequency conversion crystal 13 adopts the dual wavelength wave plate when guaranteeing each polarized component difference half-twist of fundamental frequency light, guarantees that also the polarization characteristic of frequency doubled light does not change, and makes the frequency doubled light of output have good polarization characteristic.The principle of work and the non-linear frequency of non-linear frequency conversion crystal 13 are changed the roughly the same of crystal 12, repeat no more here.
Though nonlinear crystal 1 and nonlinear crystal 2 are nonlinear crystal KTP, they can be nonlinear crystal KNbO
3, LiB
3O
5, β-BaB
2O
4, MgO:LiNbO
3, KDP.
But N non-linear frequency changed crystal 10,11,12 or 13 optical cements or in-depth optical cement and become long arbitrarily non-linear frequency to change the crystal wafer heap, and wherein N is a positive integer.
A kind of non-linear frequency conversion crystal wafer heap forms gap d → 0 between any two blocks of nonlinear crystals by 10 heaps of N sheet non-linear frequency conversion crystal.Fig. 5 is the synoptic diagram that 10 in the crystal of non-linear frequency conversion of 2 (N=2) optical contants or in-depth optical contant piles non-linear frequency conversion crystal wafer heap 14.The surperficial 1a of first block of nonlinear crystal 1 is coated with Zeng Toumo @1064nm, and the surperficial 4b of last piece nonlinear crystal 2 is coated with Zeng Toumo @1064nm﹠amp; 532nm between any two blocks of nonlinear crystals, can plate Zeng Toumo @1064nm﹠amp; Behind the 532nm optical cement together, also plated film not, directly optical cement or in-depth optical cement be together in the polishing back.The principle of work of this non-linear frequency conversion crystal 14 and non-linear frequency conversion crystal 10 are roughly identical, it is advantageous that can obtain the long arbitrarily non-linear frequency conversion crystal of length to improve frequency conversion efficiency.
A kind of non-linear frequency conversion crystal wafer heap forms gap d → 0 between any two blocks of nonlinear crystals by 11 heaps of N sheet non-linear frequency conversion crystal.Fig. 6 is the synoptic diagram that 11 in the crystal of non-linear frequency conversion of 2 (N=2) optical contants or in-depth optical contant piles non-linear frequency conversion crystal wafer heap 15.The surperficial 1a of first block of nonlinear crystal 1 is coated with Zeng Toumo @1064nm, and the surperficial 4b of last piece nonlinear crystal 2 is coated with Zeng Toumo @1064nm﹠amp; 532nm between any two blocks of nonlinear crystals, can plate Zeng Toumo @1064nm﹠amp; Behind the 532nm optical cement together, also plated film not, directly optical cement or in-depth optical cement be together in the polishing back.The principle of work of this non-linear frequency conversion crystal 15 and non-linear frequency conversion crystal 11 are roughly identical, it is advantageous that can obtain the long arbitrarily non-linear frequency conversion crystal of length to improve frequency conversion efficiency.
In like manner, but non-linear frequency crystal 12 or 13 also sheet pile in addition two kinds of non-linear frequencies conversion crystal wafers heaps.
Compare with background technology, the present invention has following outstanding effect: non-linear frequency provided by the invention conversion crystal can compensate light wave walking from the phase differential that causes through non-linear frequency conversion crystal with fundamental frequency light spatially simultaneously, the nonlinear interaction distance can strengthen greatly, all shows as full-wave plate for any wave band; Simultaneously, this non-linear frequency conversion crystal changes insensitive to ambient temperature, need not the serviceability temperature control system, simple in structure, volume is small and exquisite; And the length of each ktp crystal needs only identical, need not to be worked into a certain particular value, greatly reduces the requirement to the nonlinear crystal machining precision.
Description of drawings
Fig. 1 arranges the structural representation of placing the non-linear frequency conversion crystal 10 that forms by nonlinear crystal 1 and three blocks of nonlinear crystals 2.The optical axis direction of first block of nonlinear crystal 2 with respect to the optical axis direction of nonlinear crystal 1 along logical optical axis Rotate 180 ° placement, the optical axis direction of second block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of first block of nonlinear crystal 2, the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of second block of nonlinear crystal 2 along logical optical axis Rotate 180 ° placement.Fig. 2 arranges the structural representation of placing the non-linear frequency conversion crystal 11 that forms by nonlinear crystal 1 and three blocks of nonlinear crystals 2.The optical axis direction of first block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of nonlinear crystal 1, along logical optical axis Rotate 180 ° placement, place along logical optical axis half-twist with respect to the optical axis direction of second block of nonlinear crystal 2 by the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of first block of nonlinear crystal 2 for the optical axis direction of second block of nonlinear crystal 2.Fig. 3 arranges the structural representation of placing the non-linear frequency conversion crystal 12 that forms by nonlinear crystal 1,1/2nd wave plates 5 and nonlinear crystal 2.Nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and 1/2nd wave plates 5 are placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45.Fig. 4 arranges the structural representation of placing the non-linear frequency conversion crystal 13 that forms by nonlinear crystal 1, dual wavelength wave plate 6 and nonlinear crystal 2.Nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and dual wavelength wave plate 6 is placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45.Fig. 5 is the structural representation that 10 in the crystal of non-linear frequency conversion of 2 (N=2) optical contants or in-depth optical contant piles non-linear frequency conversion crystal wafer heap 14.Per four nonlinear crystal optical axis directions are placed as shown in Figure 1.Fig. 6 is the structural representation that 11 in the crystal of non-linear frequency conversion of 2 (N=2) optical contants or in-depth optical contant piles non-linear frequency conversion crystal wafer heap 15.Per four nonlinear crystal optical axis directions are placed as shown in Figure 2.
Embodiment
Non-linear frequency conversion crystal of the present invention is suitable for being used as low noise intracavity frequency doubling crystal and cavity external frequency multiplication crystal.Because the space is walked from eliminating, can use long crystal to increase the conversion efficiency of frequency multiplication; Walking from being compensated in time can be used for as femtosecond letter frequency-doubling crystal frequently.Conversion generation entangled photons is right down also to can be used for doing parameter conversion, especially parameter, and is significant in quantum information science.
Claims (3)
1. a non-linear frequency is changed crystal, contain following four kinds of optical elements: in nonlinear crystal 1, nonlinear crystal 2,1/2nd wave plates 5 and the dual wavelength wave plate 6 two～three kinds, it is characterized in that, nonlinear crystal 1 is the identical nonlinear crystal KTP of length with nonlinear crystal 2, press the cutting of II class phase matching direction, the surperficial 1a of nonlinear crystal 1 is coated with Zeng Toumo @1064nm, and surperficial 1b is coated with Zeng Toumo @1064nm﹠amp; 532nm, two surfaces of nonlinear crystal 2,1/2nd wave plates 5 and dual wavelength wave plate 6 all are coated with anti-reflection film; 532nm, this non-linear frequency conversion crystal has one of following four kinds of unitized constructions: (1) non-linear frequency conversion crystal 10 closely is adjacent to arrange place by nonlinear crystal 1 and three blocks of nonlinear crystals 2 and forms, the optical axis direction of first block of nonlinear crystal 2 with respect to the optical axis direction of nonlinear crystal 1 along logical optical axis Rotate 180 ° placement, the optical axis direction of second block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of first block of nonlinear crystal 2, the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of second block of nonlinear crystal 2 along logical optical axis Rotate 180 ° placement; (2) non-linear frequency conversion crystal 11 closely is adjacent to arrange place by nonlinear crystal 1 and three blocks of nonlinear crystals 2 and forms, the optical axis direction of first block of nonlinear crystal 2 is placed along logical optical axis half-twist with respect to the optical axis direction of nonlinear crystal 1, along logical optical axis Rotate 180 ° placement, place along logical optical axis half-twist with respect to the optical axis direction of second block of nonlinear crystal 2 by the optical axis direction of the 3rd block of nonlinear crystal 2 with respect to the optical axis direction of first block of nonlinear crystal 2 for the optical axis direction of second block of nonlinear crystal 2; (3) non-linear frequency conversion crystal 12 closely is adjacent to arrange place by nonlinear crystal 1,1/2nd wave plates 5 and nonlinear crystal 2 and forms, nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and 1/2nd wave plates 5 are placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45; (4) non-linear frequency conversion crystal 13 closely is adjacent to arrange place by nonlinear crystal 1, dual wavelength wave plate 6 and nonlinear crystal 2 and forms, nonlinear crystal 2 is placed in the identical mode of optical axis direction of its optical axis direction and nonlinear crystal 1, and dual wavelength wave plate 6 is placed between the above two in the mode of its optical axis direction while and the above two optical axis direction angle at 45.
2. non-linear frequency conversion crystal according to claim 1 is characterized in that nonlinear crystal 1 and nonlinear crystal 2 can be nonlinear crystal KNbO
3, LiB
3O
5, β-BaB
2O
4, MgO:LiNbO
3, KDP.
3. non-linear frequency according to claim 1 and 2 conversion crystal is characterized in that, but N non-linear frequency conversion crystal 10,11,12 or 13 optical cements or in-depth optical cement become long arbitrarily non-linear frequency conversion crystal wafer to pile, and wherein N is a positive integer.
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| CN102354072A (en) * | 2011-09-21 | 2012-02-15 | 苏州天弘激光股份有限公司 | Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion |
| CN103311793A (en) * | 2013-06-09 | 2013-09-18 | 中国科学院半导体研究所 | BBO (barium boron oxide) crystal based non-linear frequency doubler |
| CN103956643A (en) * | 2014-04-29 | 2014-07-30 | 鞍山紫玉激光科技有限公司 | High-efficiency laser harmonic frequency doubling intensifier |
| CN104149212A (en) * | 2014-07-04 | 2014-11-19 | 中国科学院理化技术研究所 | Cutting method of nonlinear optical crystal capable of realizing complete walk-off compensation |
| CN104730799A (en) * | 2013-12-20 | 2015-06-24 | 夏普株式会社 | Nonlinear Frequency Conversion (nlfc) Device And Light Source |
| CN106226969A (en) * | 2016-09-12 | 2016-12-14 | 中国科学院上海光学精密机械研究所 | The method of thermic phase mismatch in the conversion of natural compensation optical frequency |
| CN107561814A (en) * | 2017-10-11 | 2018-01-09 | 福建科彤光电技术有限公司 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
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- 2002-06-21 CN CNB021121877A patent/CN1169008C/en not_active Expired - Fee Related
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| CN102299468A (en) * | 2011-07-29 | 2011-12-28 | 湖北久之洋红外系统有限公司 | Red-green-blue three-color laser and emitting regulation method thereof |
| CN102354072A (en) * | 2011-09-21 | 2012-02-15 | 苏州天弘激光股份有限公司 | Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion |
| CN102354072B (en) * | 2011-09-21 | 2013-06-19 | 苏州天弘激光股份有限公司 | Implementation method for laser opening temperature impact resistant non-linear optical frequency conversion |
| CN103311793A (en) * | 2013-06-09 | 2013-09-18 | 中国科学院半导体研究所 | BBO (barium boron oxide) crystal based non-linear frequency doubler |
| CN103311793B (en) * | 2013-06-09 | 2015-11-18 | 中国科学院半导体研究所 | Based on frequency doubling non-linear's device of bbo crystal |
| CN104730799A (en) * | 2013-12-20 | 2015-06-24 | 夏普株式会社 | Nonlinear Frequency Conversion (nlfc) Device And Light Source |
| CN104730799B (en) * | 2013-12-20 | 2018-11-30 | 夏普株式会社 | Nonlinear frequency conversion (NLFC) device and light source |
| CN103956643A (en) * | 2014-04-29 | 2014-07-30 | 鞍山紫玉激光科技有限公司 | High-efficiency laser harmonic frequency doubling intensifier |
| CN104149212A (en) * | 2014-07-04 | 2014-11-19 | 中国科学院理化技术研究所 | Cutting method of nonlinear optical crystal capable of realizing complete walk-off compensation |
| CN104149212B (en) * | 2014-07-04 | 2017-01-11 | 中国科学院理化技术研究所 | Cutting method of nonlinear optical crystal capable of realizing complete walk-off compensation |
| CN106226969A (en) * | 2016-09-12 | 2016-12-14 | 中国科学院上海光学精密机械研究所 | The method of thermic phase mismatch in the conversion of natural compensation optical frequency |
| CN107561814A (en) * | 2017-10-11 | 2018-01-09 | 福建科彤光电技术有限公司 | A kind of device for improving nonlinear crystal frequency switched laser optical quality |
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN108199253B (en) * | 2018-01-12 | 2020-09-29 | 北京工业大学 | Efficient frequency doubling device and method |
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