CN104104005B - Walk-off compensation device of double-lath structure - Google Patents
Walk-off compensation device of double-lath structure Download PDFInfo
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- CN104104005B CN104104005B CN201410251130.2A CN201410251130A CN104104005B CN 104104005 B CN104104005 B CN 104104005B CN 201410251130 A CN201410251130 A CN 201410251130A CN 104104005 B CN104104005 B CN 104104005B
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Abstract
The invention discloses a walk-off compensation device of a double-lath structure. The device comprises a first non-linear optical crystal and a second non-linear optical crystal, wherein both of the first non-linear optical crystal and the second non-linear optical crystal are of lath shapes and are fixed together, fundamental frequency light is coupled into the first non-linear optical crystal and transmitted according to a phase matching angle, and then the fundamental frequency light and generated harmonic waves are reflected back and forth on the upper surface of the first non-linear optical crystal and the lower surface of the second non-linear optical crystal and finally are coupled and output from the second non-linear optical crystal. The walk-off compensation device of the double-lath structure, which is provided by the invention, has a simple and compact structure and good heat dissipation property; multiple crystals are not required, and thus the complexity and the cost of the device are reduced; moreover, as for a high-power pump and a crystal sensitive to temperature, temperature control devices are arranged on the upper surface of the first non-linear optical crystal and the lower surface of the second non-linear optical crystal, high conversion efficiency can be achieved, and good optical quality can also be guaranteed.
Description
Technical field
The present invention relates to nonlinear optics frequency conversion laser technical field, it is more particularly to a kind of double lath structure and walks off compensation
Device.
Background technology
Second order nonlinear effect mainly includes frequency multiplication and frequency, difference frequency, optical parametric oscillation etc..Laser frequency conversion is to laser
The development of high-tech and widen laser application tool be of great significance.Multiple ripples can be obtained by laser frequency
Long laser, for example, can produce infrared, HONGGUANG, green glow, blue light, ultraviolet and deep ultraviolet laser etc., they in large screen display, swash
The aspects such as light medical treatment, high density storage, microelectronics, micromechanics, laser holography and pumping tunable optical parameter laser have
Huge application prospect and wide market.
For angular phase matching process, i.e. noncritical phase matching, it is usually present deviation angle, i.e. Poynting vector side
To the angle with wave vector direction so that laser frequency efficiency reduces, the beam quality of frequency conversion output is deteriorated.Compensating walk-off effect can
To increase interaction length, to improve conversion efficiency, improve beam quality.At present, compensate walk-off effect and be based primarily upon control two
Block same size to be realized with the putting position of the rectangular-shaped nonlinear optical crystal of identical cut direction, but its phase interaction
Shorter with length, conversion efficiency is restricted.Cuboid with identical cut direction is subsequently proposed by 2N block same size again
The nonlinear optical crystal of shape, to increase interaction length, improves conversion efficiency, but the arrangement increases its complexity and become
This.To sum up, although the device of the compensation walk-off effect of existing structure is capable of the laser output of high conversion efficiency, exist
Complex structure, the problem of high cost.
Content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is how to simplify existing to walk off compensation device structure, reduces cost.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of double lath structure walks off compensation device, described device
Including the first nonlinear optical crystal and the second nonlinear optical crystal；Described first nonlinear optical crystal and second non-linear
Optical crystal is lath-shaped, and is fixed together；Fundamental frequency light is coupled into the first nonlinear optical crystal, passes by phase matching angle
Broadcast, afterwards, fundamental frequency light and the harmonic wave that produces are in the upper surface of the first nonlinear optical crystal and the second nonlinear optical crystal
Lower surface roundtrip, finally from the second nonlinear optical crystal coupling output；
The thickness design of described second nonlinear optical crystal is as follows：
When phase matching angle in A, the phase matching angle when uniaxial crystal, Doublings in Principal Planes of Biaxial Crystals is 30 degree～60 degree,
The thickness of described second nonlinear optical crystal can determine according to following situation：
(1), when the light only having a wavelength in conversion process is for very (e) light, that is, phase matched mode isOrOr(frequency multiplication), the thickness of the second nonlinear optical crystal is represented by d2
Wherein, ρ1Represent e light propagate in the first nonlinear optical crystal and in the second nonlinear optical crystal to the right
Deviation angle when lower section is propagated, ρ2Expression e light is in the second nonlinear optical crystal to deviation angle when propagating in upper right side, d1Table
Show the thickness of the first nonlinear optical crystal.
(2) in conversion process, one of fundamental frequency light harmony the glistening light of waves be very light when, that is, phase matched mode is
A. preferentially according to fundamental frequency e light, the thickness of the second nonlinear optical crystal may be configured as d12
Wherein, ρ11Represent that fundamental frequency e light is propagated and in the second nonlinear optical crystal in the first nonlinear optical crystal
Deviation angle when propagating to the right, ρ12Expression fundamental frequency e light is in the second nonlinear optical crystal to walking when propagating in upper right side
Digression.
When meeting formula (2), then can be multiplied interaction length.
B. according to harmonic wave e light, the thickness of the second nonlinear optical crystal may be configured as d22
Wherein, ρ21Represent that harmonic wave e light is propagated and in the second nonlinear optical crystal in the first nonlinear optical crystal
Deviation angle when propagating to the right, ρ22Expression harmonic wave e light is in the second nonlinear optical crystal to walking when propagating in upper right side
Digression.
If d12Approximate d22, then be multiplied interaction length, improves the beam quality of harmonic wave again.
(3), in conversion process, when fundamental frequency light is very light, except frequency multiplication situation, that is, phase matched mode isThe e light of the e light according to fundamental frequency light 1 and fundamental frequency light 2 respectively, the thickness of the second nonlinear optical crystal can set
It is set to d1(2)2
Wherein, ρ1(2)1Represent that fundamental frequency 1 (2) e light is propagated and in the second nonlinear optics in the first nonlinear optical crystal
Deviation angle when propagating to the right in crystal, ρ1(2)2Expression fundamental frequency 1 (2) e light is in the second nonlinear optical crystal to upper right
Deviation angle when side propagates.
Meet d12Approximate d22When, then be multiplied interaction length, improves harmonic wave optical quality.
Phase matching angle in B, the phase matching angle when uniaxial crystal, Doublings in Principal Planes of Biaxial Crystals is less than 30 degree and to be more than
25 degree, or when being more than 60 degree and being less than 65 degree, the thickness of described second nonlinear optical crystal is set to described first non-thread
The twice of the thickness of property optical crystal.
Preferably, described first nonlinear optical crystal and the second nonlinear optical crystal are by optics bonding, optical cement, folding
Penetrate rate matching fluid or air connects together.
Preferably, described coupled modes are prism-coupled mode or sharping coupled modes.
Preferably, the described prism of prism-coupled mode and the end face of nonlinear optical crystal bond together.
Preferably, described sharping coupled modes, described first nonlinear optical crystal left surface is coated with the height of fundamental frequency light
Permeable membrane；Described second nonlinear optical crystal right flank is coated with the high transmittance film of fundamental frequency light harmonic.
Preferably, described first nonlinear optical crystal can achieve large scale growth, including positive uniaxial crystal, ZnGeP2
Deng；Uniaxial negative crystal BBO, AGS, KABO, CLBO, KDP, ADP etc.；Positive biaxial crystal KTP, RTA, KTA, CBO etc.；Negative biaxal crystal
Body LBO, YCOB, GdCOB etc.；
Described second nonlinear optical crystal can achieve large scale growth, including:Positive uniaxial crystal, ZnGeP2Deng；Negative single
Axialite body BBO, AGS, KABO, CLBO, KDP, ADP etc.；Positive biaxial crystal KTP, RTA, KTA, CBO etc.；Negative biaxial crystal LBO,
YCOB, GdCOB etc..
Preferably, when high power pumping or the first nonlinear optical crystal and the second nonlinear optical crystal are temperature sensitive
When, the upper surface of described first nonlinear optical crystal and the lower surface of the second nonlinear optical crystal are respectively provided with attemperating unit.
Preferably, described fundamental frequency light harmonic is in the upper surface of the first nonlinear optical crystal and the second non-linear optical crystal
The lower surface of body is all totally reflected, if the light of a certain wavelength can not occur total reflection, described first nonlinear optical crystal
Upper surface and the second nonlinear optical crystal lower surface plate respective wavelength high-reflecting film.
(3) beneficial effect
The invention provides a kind of double lath structure walks off compensation device, the apparatus structure that the present invention provides is simple, compact,
Thermal diffusivity is good；Do not need polylith crystal, reduce complexity and the cost of device, in addition the present invention is provided with attemperating unit, can
Realize high conversion efficiency, the beam quality that again can guarantee that.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 a is the structural representation of LMDS Light Coupled Device sharping；
Fig. 1 b is the structural representation of LMDS Light Coupled Device prism；
Fig. 2 is that a kind of double lath structure of a preferred embodiment 1 of the present invention walks off the structural representation of compensation device；
Fig. 3 is that a kind of double lath structure of a preferred embodiment 1 of the present invention walks off the 213nm e light of compensation device
Walk-off effect schematic diagram；
Fig. 4 is that a kind of double lath structure of another preferred embodiment 2 of the present invention walks off the structural representation of compensation device
Figure；
Fig. 5 is that a kind of double lath structure of another preferred embodiment 2 of the present invention walks off the 266nm e light of compensation device
Walk-off effect schematic diagram；
Fig. 6 is that a kind of double lath structure of another preferred embodiment 3 of the present invention walks off the structural representation of compensation device
Figure；
Fig. 7 is that a kind of double lath structure of another preferred embodiment 3 of the present invention walks off the 2063nm e of compensation device
The schematic diagram of the walk-off effect of light.
Brief description：
1-01, the first nonlinear optical crystal；1-02, the second nonlinear optical crystal；2nd, fundamental frequency lasers；3-01,
One coupled apparatus, 3-02, the second coupled apparatus；4th, attemperating unit.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in further detail.Following examples are used for this is described
Bright, but can not be used for limiting the scope of the present invention.
Embodiment 1
Fig. 2 is that a kind of double lath structure of a preferred embodiment 1 of the present invention walks off the structural representation of compensation device；
The device of the present embodiment includes the first nonlinear optical crystal 1-01, the second nonlinear optical crystal 1-02 and fundamental frequency lasers
2；Described first nonlinear optical crystal and the second nonlinear optical crystal are lath-shaped, and are fixed together, fixed form
For optics bonding.
Described first nonlinear optical crystal 1-01 and described second nonlinear optical crystal 1-02 all from bbo crystal,
Phase matched mode isPhase matching angle is 51.1 degree；Bbo crystal has simultaneously
There are larger nonlinear factor, high damage threshold, and have larger deviation angle, be inspection double lath structure compensation walk-off effect
Splendid crystal.
Described first nonlinear optical crystal and described second nonlinear optical crystal are lamellar structure, concrete setting
For length>Wide>High lath-shaped, the first nonlinear optical crystal 1-01 is set to 17mm × 2mm × 1mm；Second nonlinear optics
Crystal 1-02 is set to 17mm × 2mm × 1.05mm；The size of the first nonlinear optical crystal 1-01 is the left oblique of 2mm × 1mm
Side plates 1064nm anti-reflection film and 266nm anti-reflection film after optical polish, to realize good transmission effects；Second is non-linear
The size of optical crystal 1-02 is that the right prism of 2mm × 1.05mm plates 1064nm anti-reflection film, 266nm increasing after optical polish
Permeable membrane and 213nm anti-reflection film, to realize the transmission effects good to fundamental frequency light and harmonic wave.
As shown in Figure 1a, the base angle θ of the first nonlinear optical crystal 1-01 and the second nonlinear optical crystal 1-02, that is, tiltedly
Side and the angle of bottom surface, it is preferably arranged to 51.1 degree, i.e. phase matching angle.As shown in figure 3, the first non-linear optical crystal
The optical axis of body 1-01 is vertical direction, and the optical axis direction of nonlinear optical crystal 1-02 is the optical axis of nonlinear optical crystal 1-01
102.2 degree of direction rotate counterclockwise, i.e. two times of phase matching angle.Fundamental frequency light is propagated in the first nonlinear optical crystal 1-01
When, meet phase-matching condition, that is, press phase matching angle and propagate；When propagating to the right, harmonic wave walks off counterclockwise, to
When upper right side is propagated, harmonic wave walks off clockwise, and deviation angle is each about 96mrad；Fundamental frequency light is in the second non-linear optical crystal
Phase-matching condition is equally met, harmonic wave walks off clockwise, deviation angle is equally about when propagating along lower right in body 1-02
For 96mrad；Along when propagating in upper right side, it is unsatisfactory for phase-matching condition, but harmonic wave equally exists and walks off, walking off direction is the inverse time
Pin direction, deviation angle is about 86mrad, and propagating along this direction does not affect harmonic wave optical quality；Due to the second nonlinear optical crystal
The thickness of 1-02 is 1.05 times of the first nonlinear optical crystal 1-01, and can be multiplied interaction length, and improves humorous
Glistening light of waves beam quality.Dotted line in Fig. 3 represents the energy flow vector direction of propagation of harmonic wave e light, and circle represents the light spot shape of harmonic wave.
In the present embodiment, fundamental frequency lasers 2 output wavelength used is the pulsed light beam of 1064nm and 266nm, repetition rate
It is 20kHz, the pulse width of 1064nm is 20ns, the pulse width of 266nm is 8ns, and spot radius are 0.2mm, vertically
The incident left prism of first nonlinear crystal 1-01 simultaneously passes through, then through the second nonlinear optical crystal 1-02, expose to second
The lower surface of the 17mm × 2mm of nonlinear optical crystal 1-02, is then reflected back the second nonlinear optical crystal 1-02, enters back into
First nonlinear optical crystal 1-01, and the upper surface of the 17mm × 2mm through the first nonlinear optical crystal 1-01 is reflected back
One nonlinear optical crystal 1-01, such fundamental frequency light harmonic the first nonlinear optical crystal 1-01 17mm × 2mm upper
Roundtrip 6 times, effective interaction length between the lower surface of 17mm × 2mm of surface and the second nonlinear optical crystal 1-02
It is about 15mm, finally high conversion efficiency and relatively is derived by the right prism of 2mm × 1.05mm of the second nonlinear optical crystal 1-02
The harmonic wave of good beam quality.
Embodiment 2
Fig. 4 is that a kind of double lath structure of another preferred embodiment 2 of the present invention walks off the structural representation of compensation device
Figure；This embodiment is to have carried out further improvement on the basis of embodiment 1, and it is with the difference of embodiment 1：One,
Lath-shaped the first nonlinear optical crystal 1-01 and the second nonlinear optical crystal 1-02 is all using negative twin shaft lbo crystal；Its
2nd, the present embodiment the first nonlinear optical crystal 1-01 is set to 24mm × 3mm × 1mm, the second nonlinear optical crystal 1-02
It is set to 24mm × 3mm × 2mm；Three, phase matched mode is：Phase place
Matching angle is (90 °, 60.7 °)；Four, fundamental frequency light is coupled into the first nonlinear optical crystal 1- by the first coupling element 3-01
01, fundamental frequency light harmonic is derived from the second nonlinear optical crystal 1-02 by the second coupling element 3-02；Five, as Fig. 1 b institute
Show, the present embodiment the first coupling element 3-01 and the second coupling element 3-02 is disposed as hypotenuse 4mm, 59.1 degree of base angle, thick 3mm
Prism, described prism is made up of quartz, and bonds together with the end face of nonlinear optical crystal；Six, shown
The big face for 24mm × 3mm of one nonlinear optical crystal 1-01 and the second nonlinear optical crystal 1-02 is all done roughening and is processed
After be respectively mounted attemperating unit 4, attemperating unit is arranged on big face temperature control area is big, temperature control effect is good, more effectively reduces temperature
Spend the phase mismatch causing, be conducive to high power pumping, this attemperating unit can be directly welded at the first nonlinear optical crystal
It is also possible to be fixed by way of inserting conducting strip on the lower surface of the upper surface of 1-01 and the second nonlinear optical crystal 1-02
On the upper surface of the first nonlinear optical crystal 1-01 and the lower surface of the second nonlinear optical crystal 1-02, attemperating unit 4
Used in cooling medium can be the liquid such as water or mixed liquor or the gas such as air or nitrogen or mixed gas.
As shown in figure 5, the x-axis of the first nonlinear optical crystal 1-01 is straight down, the second nonlinear optical crystal 1-02
X-axis direction be nonlinear optical crystal 1-02 121.4 degree of x-axis direction rotate counterclockwise, that is, 2 times 60.7 °.The base of 1064nm
The fundamental frequency o light of frequency o light and 355nm, spot radius are 0.1mm, all with straight at 30.9 degree of incident first coupling element 3-
01, it is again incident on the left side of the first nonlinear optical crystal 1-01.Fundamental frequency light is in the first nonlinear optical crystal 1-01
During propagation, meet phase-matching condition；When propagating to the right, harmonic wave walks off counterclockwise, when propagating to upper right side
When, harmonic wave walks off clockwise, and deviation angle is each about 17.4mrad.Fundamental frequency light is in the second nonlinear optical crystal 1-02
Phase-matching condition is met, harmonic wave walks off clockwise, and deviation angle is also about 17.4mrad when propagating along lower right；Base
Frequency light, along when propagating in upper right side, is unsatisfactory for phase-matching condition, and walking off of harmonic wave equally exists, and walks off direction along side clockwise
To deviation angle is about 1.5mrad, deviation angle very little now, and does not affect harmonic wave optical quality when propagating along this direction；Due to
Second nonlinear optical crystal 1-02 thickness is 2 times of the first nonlinear optical crystal 1-01, and can be multiplied interaction
Length, and the harmonic optcial beam quality having ensured.To be incident to the basic frequency beam of the first coupling element 3-01 straight at 30.9 degree
Reflect 4 times between the upper surface of the first nonlinear optical crystal 1-01 and the lower surface of the second nonlinear optical crystal 1-02, have
Effect operating distance is about 19mm, obtains the harmonic beam of high power and high light beam quality.Dotted line in Fig. 5 represents the energy of harmonic wave e light
The flow vector direction of propagation, the circle of in figure represents the light spot shape of harmonic wave.
Embodiment 3
Fig. 6 is that a kind of double lath structure of another preferred embodiment 3 of the present invention walks off the structural representation of compensation device
Figure；This embodiment is to have carried out further improvement on the basis of embodiment 1, and it is differed only in embodiment 1：Its
First, lath-shaped the first nonlinear optical crystal 1-01 and the second nonlinear optical crystal 1-02 is all using ktp crystal；Two,
First nonlinear optical crystal 1-01 is set to 32mm × 2mm × 1.5mm, the second nonlinear optical crystal 1-02 is set to 32mm
×2mm×1.6mm；Three, the pump light of the second type-Ⅱphase matching ktp crystal optical parametric oscillation is 1064nm o light, flashlight
For 2063nm e light, idle light is 2196nm o light, and its phase matching angle is (50.2 °, 0 °)；Four, the first nonlinear optics
The base angle of crystal 1-01 and the second nonlinear optical crystal 1-02 is set to 50.2 degree；Five, the first nonlinear optical crystal 1-
01 left prism and the right prism of the second nonlinear optical crystal 1-02 all plate after optical polish 1064nm anti-reflection film,
2063nm anti-reflection film and 2196nm anti-reflection film.
As shown in fig. 7, the z-axis of the first nonlinear optical crystal 1-01 is straight down, the second nonlinear optical crystal 1-02
Z-axis direction be the first nonlinear optical crystal 1-01 100.4 degree of z-axis direction rotate counterclockwise, that is, two times 50.2 °.
1064nm o light is with the left prism straight at 39.8 degree of vertical incidence to the first nonlinear optical crystal 1-01.Described
1064nm o light repetition rate is 1kHz, and pulse width is 15ns, and spot radius are 0.1mm.In the first nonlinear optical crystal
When propagating in 1-01, all meet phase-matching condition, when propagating to the right, 2063nm e light walks off clockwise；To
When upper right side is propagated, 2063nm e light all walks off counterclockwise, and deviation angle is each about 48mrad.Fundamental frequency light is in the second non-thread
Property crystal 1-02 in propagate, meet phase-matching condition when propagating along lower right, 2063nm e light walks off counterclockwise, walk
Digression is also about 48mrad；Fundamental frequency light, along when propagating in upper right side, is unsatisfactory for phase-matching condition, and 2063nm e light is to clockwise
Direction walks off, and deviation angle is about 40mrad, but does not affect the beam quality of 2063nm e light along this direction；Because second is non-linear
Optical crystal 1-02 thickness is 1.08 times of the first nonlinear optical crystal 1-01, can increase interaction length at double,
And improve beam quality.It is coated with the left prism of first nonlinear crystal 1-01 and the right prism of the second nonlinear crystal 1-02
1064nm anti-reflection film, 2063nm anti-reflection film and 2196nm anti-reflection film, to strengthen its transmission effects.With incident straight at 39.8 degree
To the first nonlinear optical crystal 1-01 pump beam in the upper surface of the first nonlinear optical crystal 1-01 and the second non-thread
Property optical crystal 1-02 lower surface between roundtrip 8 times, effective interaction distance about 31mm, obtain high conversion efficiency and
The output of preferable beam quality.Dotted line in Fig. 7 represents the energy flow vector direction of propagation of 2063nm e light, the 2063nm that circle represents
The light spot shape of e light.
Comprehensive above example understand, the structure of the present invention is simple, compact, low cost, can fully increase fundamental frequency light and
Folding times in nonlinear optical crystal for the harmonic wave, improve conversion efficiency, under existing coating technique, can at utmost reduce
Fundamental frequency light and the power loss of harmonic wave.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this
Bright be described in detail, it will be understood by those within the art that, technical scheme is carried out various combinations,
Modification or equivalent, without departure from the spirit and scope of technical solution of the present invention, the right that all should cover in the present invention will
Ask in the middle of scope.
Claims (8)
1. a kind of double lath structure walk off compensation device it is characterised in that described device include the first nonlinear optical crystal and
Second nonlinear optical crystal；Described first nonlinear optical crystal and the second nonlinear optical crystal are lath-shaped, and solid
It is scheduled on together；Fundamental frequency light is coupled into the first nonlinear optical crystal, by phase matching angle propagate, afterwards, fundamental frequency light and produce
The upper surface in the first nonlinear optical crystal for the harmonic wave and the lower surface roundtrip of the second nonlinear optical crystal, finally from
Two nonlinear optical crystal coupling outputs；
Described first nonlinear optical crystal and described second nonlinear optical crystal all include：Uniaxial crystal and biaxial crystal；
The thickness design of described second nonlinear optical crystal is as follows：
When phase matching angle in A, the phase matching angle when uniaxial crystal, Doublings in Principal Planes of Biaxial Crystals is 30 degree～60 degree, described
The thickness of the second nonlinear optical crystal can determine according to following situation：
(1), when the light only having a wavelength in conversion process is for very (e) light, that is, phase matched mode isOrOr(frequency multiplication), the thickness of the second nonlinear optical crystal is represented by d2
Wherein, ρ1Represent that e light is propagated in the first nonlinear optical crystal and passed to the right in the second nonlinear optical crystal
The deviation angle of sowing time, ρ2Expression e light is in the second nonlinear optical crystal to deviation angle when propagating in upper right side, d1Represent first
The thickness of nonlinear optical crystal；
(2) in conversion process, one of fundamental frequency light harmony the glistening light of waves be very light when, that is, phase matched mode is
A. according to fundamental frequency e light, the thickness of the second nonlinear optical crystal may be configured as d12
Wherein, ρ11Represent fundamental frequency e light propagate in the first nonlinear optical crystal and in the second nonlinear optical crystal to the right
Deviation angle when lower section is propagated, ρ12Expression fundamental frequency e light is in the second nonlinear optical crystal to deviation angle when propagating in upper right side；
When meeting formula (2), then can be multiplied interaction length；
B. according to harmonic wave e light, the thickness of the second nonlinear optical crystal may be configured as d22
Wherein, ρ21Represent harmonic wave e light propagate in the first nonlinear optical crystal and in the second nonlinear optical crystal to the right
Deviation angle when lower section is propagated, ρ22Expression harmonic wave e light is in the second nonlinear optical crystal to deviation angle when propagating in upper right side；
If d12Approximate d22, then be multiplied interaction length, improves the beam quality of harmonic wave again；
(3), in conversion process, when fundamental frequency light is very light, except frequency multiplication situation, that is, phase matched mode isThe e light of the e light according to fundamental frequency light 1 and fundamental frequency light 2 respectively, the thickness of the second nonlinear optical crystal can set
It is set to d1(2)2
Wherein, ρ1(2)1Represent that fundamental frequency 1 (2) e light is propagated and in the second nonlinear optical crystal in the first nonlinear optical crystal
In deviation angle when propagating to the right, ρ1(2)2Represent that fundamental frequency 1 (2) e light passes to upper right side in the second nonlinear optical crystal
The deviation angle of sowing time；
Meet d12Approximate d22When, then be multiplied interaction length, improves harmonic wave optical quality；
Phase matching angle in B, the phase matching angle when uniaxial crystal, Doublings in Principal Planes of Biaxial Crystals is less than 30 degree and to be more than 25
Degree, or more than 60 degree and when being less than 65 degree, it is non-linear that the thickness of described second nonlinear optical crystal is set to described first
The twice of the thickness of optical crystal.
2. device according to claim 1 is it is characterised in that described first nonlinear optical crystal and the second nonlinear optical
Learn crystal to connect together by optics bonding, optical cement, index-matching fluid or air.
3. device according to claim 1 is it is characterised in that described coupled modes are prism-coupled mode or sharping coupling
Conjunction mode.
4. device according to claim 3 is it is characterised in that described prism-coupled mode, described prism and nonlinear optical
The end face learning crystal bonds together.
5. device according to claim 3 is it is characterised in that described sharping coupled modes, described first nonlinear optical
Learn the high transmittance film that crystal left surface is coated with fundamental frequency light；Described second nonlinear optical crystal right flank is coated with fundamental frequency light harmonic
High transmittance film.
6. device according to claim 1 is it is characterised in that described first nonlinear optical crystal includes positive uniaxial crystal
ZnGeP2；Uniaxial negative crystal BBO, AGS, KABO, CLBO, KDP, ADP；Positive biaxial crystal KTP, RTA, KTA, CBO；Negative biaxal crystal
Body LBO, YCOB, GdCOB；
Described second nonlinear optical crystal includes:Positive uniaxial crystal ZnGeP2；Uniaxial negative crystal BBO, AGS, KABO, CLBO,
KDP、ADP；Positive biaxial crystal KTP, RTA, KTA, CBO；Negative biaxial crystal LBO, YCOB, GdCOB.
7. device according to claim 1 is it is characterised in that when high power pumping or the first nonlinear optical crystal and the
When two nonlinear optical crystals are temperature sensitive, the upper surface of described first nonlinear optical crystal and the second non-linear optical crystal
The lower surface of body is respectively provided with attemperating unit.
8. device according to claim 1 is it is characterised in that described fundamental frequency light harmonic is in the first nonlinear optical crystal
Upper surface and the lower surface of the second nonlinear optical crystal be all totally reflected, if the light of a certain wavelength can not be totally reflected
When, the lower surface of the upper surface of described first nonlinear optical crystal and the second nonlinear optical crystal plates the high anti-of respective wavelength
Film.
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| 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 |
| CN108319092A (en) * | 2018-03-30 | 2018-07-24 | 上海交通大学 | Utilize the method for being periodically totally reflected realization quasi-phase matched |
| CN111948870A (en) * | 2020-06-30 | 2020-11-17 | 中国科学院理化技术研究所 | Multi-pass prism coupler with air interlayer |
| CN114389137A (en) * | 2021-12-30 | 2022-04-22 | 武汉光谷航天三江激光产业技术研究院有限公司 | Slab nonlinear crystal optical parameter oscillation device and conversion method |
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| CN201853941U (en) * | 2010-08-26 | 2011-06-01 | 大恒新纪元科技股份有限公司 | All-solid triple frequency laser |
| CN103050880A (en) * | 2012-12-28 | 2013-04-17 | 清华大学 | Laser walk-off effect compensation method |
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| JP2002287193A (en) * | 2001-03-23 | 2002-10-03 | Toshiba Corp | Wavelength conversion element, wavelength conversion device and laser device |
| US20090041067A1 (en) * | 2007-08-07 | 2009-02-12 | Onyx Optics | Engineered nonlinear optical crystal composites for frequency conversion |
| WO2012148800A1 (en) * | 2011-04-29 | 2012-11-01 | Bae Systems Information And Electronic Systems Integration Inc. | Walk-off compensator with tilt function |
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| CN201853941U (en) * | 2010-08-26 | 2011-06-01 | 大恒新纪元科技股份有限公司 | All-solid triple frequency laser |
| CN103050880A (en) * | 2012-12-28 | 2013-04-17 | 清华大学 | Laser walk-off effect compensation method |
Non-Patent Citations (1)
| Title |
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| A picosecond widely tunable deep-ultraviolet laser for angle-resolved photoemission spectroscopy;Zhang Feng-Feng et al.;《Chin. Phys. B》;20131231;第22卷(第6期);064212-1至064212-3 * |
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