CN2540646Y - Laser frequency conversion phase matching apparatus made by nonlinear optical crystal - Google Patents
Laser frequency conversion phase matching apparatus made by nonlinear optical crystal Download PDFInfo
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- CN2540646Y CN2540646Y CN 02209395 CN02209395U CN2540646Y CN 2540646 Y CN2540646 Y CN 2540646Y CN 02209395 CN02209395 CN 02209395 CN 02209395 U CN02209395 U CN 02209395U CN 2540646 Y CN2540646 Y CN 2540646Y
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Abstract
The utility model relates to a laser frequency conversion phase matcher which is made of a nonlinear optical crystal, and comprises a nonlinear optical crystal, the upper surface and the lower surface of the nonlinear optical crystal are parallel, the side surface of the nonlinear optical crystal is a incident end face of a fundamental frequency laser, the incident end face is cut into a phase matching angle which is capable of leading the phase matching angle to directly incidence or incidence into the crystal through a coupler, and the side surfaces of the nonlinear optical crystal are all capable of being an exit end surface. The phase matcher of the utility model is capable of using the nonlinear optical crystals which are not easy to cut and are not capable of being cut are is not convenient to be cut because the cost is high, thereby fully using the volume of the crystal, increasing the effective length of the crystal, improving the conversion efficiency of the high frequency, so the utility model is effectively used in a laser frequency conversion field, and provides an important approach for the full use of the nonlinear optical crystal.
Description
Technical field
The utility model relates to a kind of laser frequency position device that is complementary, particularly a kind of laser frequency position that makes of nonlinear optical crystal device that is complementary.
Background technology
At present, known nonlinear optical crystal laser frequency (contains frequency multiplication, and frequently, difference frequency and optical parametric oscillation and amplification) be be complementary angle cutting of nonlinear optical crystal step-by-step, pressed certain incident angle incident by the laser of frequency conversion, accurately rotate crystal again and adjust incident angle angle (title angle tuning) or the control crystal temperature effect of being complementary that put in place, making crystal reach the position is complementary and realizes effective frequency conversion output, as document 1 (V.G.Dmitriev, G.G.Gurzadyan, D.N.Nikogosyan, " Handbook of Nonlinear Optical Crystals ", second Revisedand updated Edition, Springer-Verlag, Berlin, Heidelberg, New York, London, Paris, Tokyo, Hong Kong (1996)) introduced.But, the nonlinear optical crystal that has is difficult for cutting, the nonlinear optical crystal finite volume that has, can not therefrom cut out necessary shape to satisfy the phase-matching angle requirement, the nonlinear optical crystal that has costs an arm and a leg, and it is too high to be cut into behind the given shape its use cost, the crystal volume that has is little, be cut into thin thickness after the phase matching direction, promptly action length is short, and frequency conversion efficiency is low.For example the KBBF crystal has lot of advantages at ultraviolet, deep ultraviolet in the field.Its cutoff wavelength in the ultraviolet spectrum district is 155nm, according to calculating, use direct frequency-doubling method the shortest obtainable frequency multiplication wavelength to reach 165nm, so this crystal expands to 184.7nm once the minimal wave length that just can obtain direct frequency multiplication of coming out from 204.8nm (bbo crystal obtained in 1986), and is expected to realize six frequencys multiplication (frequency-doubled conversion from 355nm to 177.5nm) of Nd:YAG laser (1064nm).Because the layer structure habit of KBBF crystal, only can grow at present～thin slice (the Z axle is perpendicular to sheet surface) of 1mm thickness, can't be according to the cutting of phase-matching angle degree, can only be by rotating crystal, the mode that changes incident angle realizes being complementary.Yet along with fundamental light wave length moves to the shortwave direction, the phase-matching angle θ pm of KBBF crystal increases thereupon, thereby causes the incident angle of fundamental frequency light constantly to increase.According to document 2 (C.T.Chen, Z.Y.Xu, D.Q.Deng, J.Zhang, G.K.Wong, B.Wu, N.Ye andD.Tang, " The vacuum ultraviolet phase-matching characteristics of nonlinearoptical KBe
2BO
3F
2Crystal "; Appl.Phys.Lett.68 (21); 2930-2932 (1996)) in the data of report can calculate, if only depend on the incident angle that changes incident light to realize that the position of different wave length is complementary, and can't realize the frequency multiplication to the following light wave of 470nm so.And employing the utility model then can be realized the frequency multiplication output of the following fundamental frequency light of KBBF crystal 4 70nm and the crystal action length that can be multiplied.
Summary of the invention
The purpose of this utility model be to overcome above-mentioned nonlinear optical crystal exist difficult, can not or the inconvenience defective of cutting according to the pairing phase-matching angle of specific wavelength, need not can realize that just the position is complementary by the cutting of phase matching direction and provide a kind of, the laser that satisfies specific incident wavelength is realized the requirement of frequency transformation, and make full use of the crystal volume, the laser frequency position that makes of nonlinear optical crystal that increases the crystal effective length device that is complementary.
The purpose of this utility model is achieved in that
The laser frequency position that makes of nonlinear optical crystal that the utility model the provides device that is complementary, comprise a nonlinear optical crystal, it is characterized in that: the upper and lower surface of described nonlinear optical crystal is parallel, its side is the incident end face of fundamental frequency light, this incident end face is cut into to make the direct incident of fundamental frequency light or incide in the crystal by coupling mechanism and can reaches phase matching angle, and the side of nonlinear optical crystal all can be the outgoing end face.
Described fundamental frequency light is total reflection on the parallel two sides in nonlinear optical crystal, in crystal, transmit, realize phase matching, produce frequency conversion light, from its side outgoing, the outgoing end face is cut into beam projecting is got final product, and light beam can be from same the incident and the outgoing of described non-linear optic crystal laser variable frequency phase adapter, also can be from its incident of not coplanar and outgoing.
The described laser frequency position that makes of nonlinear optical crystal each face of device that is complementary can directly contact use with air, also plated film or use matching fluid thereon.
The described laser frequency position that makes of the nonlinear optical crystal device that is complementary, can on the incident end face of crystal and/or outgoing end face, utilize super-smooth surface to realize that plane of crystal contacts (promptly cohering by optical cement) with the light of the prism that is coupled, bonding respectively incident coupling prism and outgoing coupling prism, coupling mechanism such as prism-coupled, grating coupling.
The be complementary beam incident angle of device of the described laser frequency position that makes of nonlinear optical crystal can be 0 °, Brewster angle, also can be other angle.
The be complementary light beam emergence angle of device of the described laser frequency position that makes of nonlinear optical crystal can be 0 °, Brewster angle, also can be other angle.
The be complementary light beam exit facet of parallel or not parallel this non-linear optic crystal laser variable frequency phase adapter of the beam incident surface of device of the described laser frequency position that makes of nonlinear optical crystal.
Described nonlinear optical crystal comprises: KBe
2BO
3F
2(KBBF), K
2Al
2B
2O
7(KABO), BaAl
2B
2O
7(BABO), also can be other nonlinear optical crystal.
Superiority of the present utility model:, can't can't realize the frequency-doubled conversion of some wavelength according to the position direction cutting that is complementary because some crystal still can not grow large-sized monocrystalline at present.And the laser frequency of the present utility model position device that is complementary under the condition that the direction that need not be complementary according to the position is cut crystal, can be realized the frequency multiplication frequency inverted of KBBF crystal to 354.7nm, reaches the purpose that can make full use of the existing volume of crystal.
The laser frequency position that makes of nonlinear optical crystal that the utility model the provides device that is complementary can make not according to the be complementary nonlinear crystal of direction cutting of position and realize that the position is complementary, and obtains frequency conversion output; Position of the present utility model is complementary, and device can be difficult for those to cut, can not cut or the nonlinear crystal of the inconvenience cutting owing to involve great expense uses, make full use of the crystal volume, increase the crystal effective length, improve frequency conversion efficiency, be applied to the laser frequency field, for the abundant application of non-linear optical crystal material provides a kind of important channel with being effective.
The KABO crystal still can not grow large-sized monocrystalline at present, if according to be complementary direction cutting of position, thickness is little, and action length is short, and frequency conversion efficiency is low.Use the technical solution of the utility model, action length can be increased by 4 times, make full use of the crystal volume, improve frequency conversion efficiency greatly.
Description of drawings:
Fig. 1 is the synoptic diagram of an embodiment of non-linear optic crystal laser variable frequency phase adapter of the present utility model;
Fig. 2 is the be complementary synoptic diagram of another embodiment of device of laser frequency of the present utility model position;
Fig. 3 is the be complementary synoptic diagram of another embodiment of device of laser frequency of the present utility model position;
The drawing explanation:
A-fundamental frequency light; The B-frequency doubled light;
The 1-nonlinear optical crystal; The plated film on 2-nonlinear optical crystal surface;
3-incident coupling prism; 4-outgoing coupling prism;
The 5-incident end face; 6-outgoing end face;
N-nonlinear optical crystal surface normal; Z-nonlinear optical crystal optic axis Z axle;
The angle of α 1-nonlinear optical crystal incident end face and plane of crystal;
The angle of α 2-nonlinear optical crystal outgoing end face and plane of crystal;
θ i-angle of incidence of light; θ o-beam projecting angle;
θ b-Brewster angle;
θ
PM-phase-matching angle; φ
PM-phase-matching angle;
θ 1-incident coupling prism vertex angle; θ 2-outgoing coupling prism vertex angle;
D-nonlinear optical crystal thickness; L-nonlinear optical crystal length;
Embodiment:
Make a kind of laser frequency position that makes of nonlinear optical crystal of the present utility model device that is complementary by Fig. 1:
One block length L=6.9mm, the KBBF nonlinear optical crystal 1 of thickness d=0.6mm, 1 two surfaces of this crystal are parallel to each other, and these two faces are perpendicular to the Z axle of crystal; One side of nonlinear optical crystal 1 is an incident end face 5, and incident end face 5 is cut into and 1=66 ° of nonlinear optical crystal 1 surperficial angle α; The another side of nonlinear optical crystal 1 is an outgoing end face 6, and outgoing end face 6 is cut into and 2=80 ° of nonlinear optical crystal 1 surperficial angle α, constitutes the non-linear optic crystal laser variable frequency phase adapter of present embodiment.
Wavelength be the fundamental frequency light A of 354.7nm with 0 ° of angle incident, in nonlinear optical crystal 1, can reach the phase-matching angle θ of six frequencys multiplication
PM=66.33 °, realize the frequency inverted of 354.7nm to 177.4nm, total reflection takes place in light on two surfaces of nonlinear optical crystal 1, continue to realize phase matching and transmit, and the wavelength of generation is that the frequency doubled light B of 177.4nm is with Brewster angle θ
b=34 ° of outgoing.
Nonlinear optical crystal 1 is the KBBF crystal, and this crystal growth is a thin slice shape, and Surface Vertical is in its Z axle.This crystal still can not grow large-sized monocrystalline at present, can't can't realize the frequency-doubled conversion of the following wavelength of 470nm according to be complementary direction cutting of position.Use the structure of present embodiment, under the condition that the direction that need not be complementary according to the position is cut crystal, can realize the frequency inverted of KBBF crystal, and can make full use of the existing volume of crystal 354.7nm.
Make a kind of laser frequency position that makes of nonlinear optical crystal of the present utility model device that is complementary by Fig. 2:
One block length L=3.2mm, the KABO nonlinear optical crystal 1 of thickness d=1mm, this nonlinear optical crystal 1 has two surfaces that are parallel to each other, and these two Surface Vertical are in the Z of crystal axle; One side of nonlinear optical crystal 1 is an incident end face 5, also is outgoing end face 6 simultaneously, and be cut into and nonlinear optical crystal 1 Surface Vertical this side; Another side plating 532nm and the 266nm high-reflecting film 2 of nonlinear optical crystal 1, the non-linear optic crystal laser variable frequency phase adapter of formation present embodiment.
Among Fig. 2, wavelength be the fundamental frequency light A of 532nm with θ i=55.3 ° incident, the angle with optical axis Z axle in crystal is θ
PM=58.1 °, (phase-matching angle of 532nm → 266nm) realizes that the position is complementary, and producing wavelength is the frequency doubled light B of 266nm to reach quadruple.Total reflection takes place in light on upper and lower surface, reflect on the side that is coated with 532nm and 266nm high-reflecting film, and continue transmission and realization phase matching in crystal, and light is from plane of incidence outgoing.
Particularly the KABO crystal still can not grow large-sized monocrystalline at present, if according to be complementary direction cutting of position, thickness is little, and action length is short, and frequency conversion efficiency is low.Use present embodiment, action length can be increased by 4 times, make full use of the crystal volume, improve frequency conversion efficiency greatly.
Embodiment 3:
Make a kind of laser frequency position that makes of nonlinear optical crystal of the present utility model device that is complementary by Fig. 3:
One block length L=5.16mm, the KBBF nonlinear optical crystal 1 of thickness d=1mm, this crystal 1 has two surfaces that are parallel to each other, and these two Surface Vertical are in the Z of crystal axle; One side of nonlinear optical crystal 1 is an incident end face 5, and this side is cut into vertical with plane of crystal; Another side of crystal 1 is an outgoing end face 6, and this side also is cut into vertical with plane of crystal; On the incident end face 5 of crystal and outgoing end face 6, use super-smooth surface to realize that plane of crystal contacts (promptly cohering by optical cement) with the light of the prism that is coupled, bonding respectively incident coupling prism 3 and outgoing coupling prism 4, incident coupling prism 3 and outgoing coupling prism 4 are respectively the fused quartz material right-angle prisms of vertex angle theta 1=54.6 ° and vertex angle theta 2=52.6 °, constitute the non-linear optic crystal laser variable frequency phase adapter of present embodiment.
One wavelength is that the fundamental frequency light A of 532nm impinges perpendicularly on prism 4, and the angle with optical axis Z axle in crystal is θ
PM=36.4 °, (phase-matching angle of 532nm → 266nm) realizes that the position is complementary, and producing wavelength is the frequency doubled light B of 266nm to reach KBBF crystal quadruple.Total reflection takes place in light on upper and lower surface, continue transmission and realization phase matching in crystal, and frequency doubled light B shines prism 5 from another face of crystal with θ o=52.6 °, vertical outgoing.
The KBBF crystal growth is a thin slice shape, also can't grow large-sized monocrystalline at present, and thickness only about 1mm, can't cut according to the phase matching direction, and incident angle is big when realizing quadruple, and loss is very big.Use present embodiment, can under the situation of sliced crystal not, realize the quadruple of KBBF crystal, and the effective length of crystal is increased to 8.7mm, thereby improve frequency conversion efficiency greatly.
Embodiment 4:
Make a kind of laser frequency position that makes of nonlinear optical crystal of the present utility model device that is complementary by Fig. 4:
A crystal length L=3.6mm, the LBO nonlinear optical crystal 1 of thickness d=3mm, two surfaces of this crystal 1 are parallel to each other, and perpendicular to the X-axis of crystal, these two surfaces are coated with 1064nm and 532nm high-reflecting film 2; One side of nonlinear optical crystal 1 is an incident end face 5, and this incident end face 5 is cut into and 1=168.7 ° of the angle α of plane of crystal; Another side of crystal 1 is an outgoing end face 6, and this outgoing end face 6 is cut into and 2=168.7 ° of the angle α of plane of crystal, constitutes the non-linear optic crystal laser variable frequency phase adapter of present embodiment.
One wavelength be the fundamental frequency light A of 1064nm with 0 ° of angle incident, in crystal, can reach the phase-matching angle φ of two frequencys multiplication
PM=11.3 °, realize the frequency inverted of 1064nm to 532nm, light is coated with at crystal on two surfaces of 1064nm and 532nm high-reflecting film total reflection takes place, and continues to realize phase matching and transmits, and the wavelength of generation is that the frequency doubled light B of 532nm is with 0 ° of angle outgoing.
LBO is two frequency-doubling crystals of using always, costs an arm and a leg according to the be complementary large size single crystal of direction cutting of position.Use present embodiment, only use 3 * 3.6mm
2Crystal, the crystal effective length has just reached 18.4mm, and needn't reduce the crystal volume that needs greatly according to be complementary direction cutting of position.
Claims (6)
1. a laser frequency position that makes of nonlinear optical crystal device that is complementary, comprise nonlinear optical crystal, it is characterized in that: the upper and lower surface of described nonlinear optical crystal is parallel, its side is the incident end face of fundamental frequency light, this incident end face is cut into to make the direct incident of fundamental frequency light or incide in the crystal by coupling mechanism and can reaches phase matching angle, and the side of nonlinear optical crystal all can be the outgoing end face.
2. by the described laser frequency position that makes of nonlinear optical crystal of claim 1 device that is complementary, it is characterized in that: also be included on each face of non-linear optic crystal laser variable frequency phase adapter plated film or scribble matching fluid.
3. by the described laser frequency position that makes of nonlinear optical crystal of claim 1 device that is complementary, it is characterized in that: also be included in and utilize super-smooth surface to realize that plane of crystal contact with the light of coupling prism on the incident end face of crystal and/or the outgoing end face, bonding respectively incident prism and/or the outgoing prism that is coupled that is coupled.
4. by the described laser frequency position that makes of nonlinear optical crystal of claim 3 device that is complementary, it is characterized in that: described coupling mechanism comprises prism-coupled, grating coupling.
5. by the described laser frequency position that makes of nonlinear optical crystal of claim 1 device that is complementary, it is characterized in that: the crystal on side face of this non-linear optic crystal laser variable frequency phase adapter is incident end face or is the outgoing end face.
6. by the described laser frequency position that makes of nonlinear optical crystal of claim 1 device that is complementary, it is characterized in that: described nonlinear optical crystal comprises: KBe
2BO
3F
2(KBBF), K
2Al
2B
2O
7(KABO), BaAl
2B
2O
7(BABO), also can be other nonlinear optical crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02209395 CN2540646Y (en) | 2002-03-29 | 2002-03-29 | Laser frequency conversion phase matching apparatus made by nonlinear optical crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02209395 CN2540646Y (en) | 2002-03-29 | 2002-03-29 | Laser frequency conversion phase matching apparatus made by nonlinear optical crystal |
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| Publication Number | Publication Date |
|---|---|
| CN2540646Y true CN2540646Y (en) | 2003-03-19 |
Family
ID=33689823
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02209395 Expired - Lifetime CN2540646Y (en) | 2002-03-29 | 2002-03-29 | Laser frequency conversion phase matching apparatus made by nonlinear optical crystal |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244499A (en) * | 2018-05-09 | 2019-09-17 | 中国科学院理化技术研究所 | Nonlinear frequency conversion crystal |
| CN110911957A (en) * | 2019-12-04 | 2020-03-24 | 安徽理工大学 | Nonlinear optical crystal laser frequency conversion coupler |
-
2002
- 2002-03-29 CN CN 02209395 patent/CN2540646Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244499A (en) * | 2018-05-09 | 2019-09-17 | 中国科学院理化技术研究所 | Nonlinear frequency conversion crystal |
| CN110244499B (en) * | 2018-05-09 | 2022-07-15 | 同方中科超光科技有限公司 | Nonlinear frequency conversion crystal |
| CN110911957A (en) * | 2019-12-04 | 2020-03-24 | 安徽理工大学 | Nonlinear optical crystal laser frequency conversion coupler |
| CN110911957B (en) * | 2019-12-04 | 2020-10-09 | 安徽理工大学 | Nonlinear optical crystal laser frequency conversion coupler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20050817 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20050817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |