CN100492149C - Cross stacked laser crystal frequency doubler - Google Patents
Cross stacked laser crystal frequency doubler Download PDFInfo
- Publication number
- CN100492149C CN100492149C CNB200310115261XA CN200310115261A CN100492149C CN 100492149 C CN100492149 C CN 100492149C CN B200310115261X A CNB200310115261X A CN B200310115261XA CN 200310115261 A CN200310115261 A CN 200310115261A CN 100492149 C CN100492149 C CN 100492149C
- Authority
- CN
- China
- Prior art keywords
- crystal
- frequency
- laser
- frequency multiplier
- phase matching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 166
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 235000012431 wafers Nutrition 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 1
- 229910021645 metal ion Inorganic materials 0.000 claims 1
- 239000011707 mineral Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 239000004065 semiconductor Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 241000931526 Acer campestre Species 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 208000001215 Cutis marmorata telangiectatica congenita Diseases 0.000 description 1
- 240000001689 Cyanthillium cinereum Species 0.000 description 1
- 241000533950 Leucojum Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 241000159750 Urtica cannabina Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Images
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
交叉叠加型激光晶体倍频器涉及激光变频技术领域。它由是由多片相同的、已经满足相位匹配条件的倍频晶体片彼此互成一定的角度叠加而成。交叉叠加型激光晶体倍频器，结构紧凑、简单、使用方便、成本低的实用性。它在发散度大的激光束的倍频中，不仅可以提高倍频输出效率，而且可以改善倍频输出光斑的光束质量，同时还可以适当地补赏掉激光在非线性晶体中的离散效应，对于双折射特别大的非线性晶体还可以得到新的开拓应用。对于采用非线性光学晶体对半导体激光器LD、大光斑输出激光强聚焦输出光的倍频等变频方面尤其适用。
A cross-superimposed laser crystal frequency multiplier relates to the technical field of laser frequency conversion. It is composed of multiple identical frequency-doubling crystals that meet the phase-matching conditions and are superimposed at a certain angle to each other. The cross superimposed laser crystal frequency multiplier has compact structure, simple structure, convenient use, low cost and practicability. In the frequency doubling of the laser beam with large divergence, it can not only improve the frequency doubling output efficiency, but also improve the beam quality of the frequency doubling output spot, and at the same time, it can properly compensate for the discrete effect of the laser in the nonlinear crystal, For nonlinear crystals with particularly large birefringence, new development applications can also be obtained. It is especially suitable for the frequency conversion of the semiconductor laser LD and the frequency doubling of the output light of the large-spot output laser with strong focus by using nonlinear optical crystals.
Description
Technical field
The present invention relates to the laser frequency technical field.
Technical background
As everyone knows, laser frequency is a key areas in the laser technology.Nonlinear optical crystal frequency conversion (frequency multiplication and frequently, difference frequency and optical parametric oscillator and amplification etc.) be most important in laser technology, use again ten minutes laser frequency technology widely.
Nonlinear optical effect by nonlinear optical crystal realizes in the laser frequency process, two factor influences of dark Stimulated Light beam quality of the effect of frequency conversion (efficient, beam quality etc.) and nonlinear crystal inherent characteristic.For overcoming these influences, once adopted some technological means at various concrete conditions in the past.The present invention be directed to the big laser beam of divergence and carry out the laser frequency aspect, propose and implement a kind of brand-new nonlinear crystal frequency doubling device---intersection superimposed type laser crystal frequency multiplier.
Utilize the laser frequency of nonlinear optical crystal, comprise frequency multiplication and several forms such as frequency, difference frequency, optical parametric oscillation and amplification.Conversion efficiency is the index that laser frequency at first will be considered.The key factor that influences frequency conversion effect (referring to the harmonious glistening light of waves beam quality of conversion efficiency here) mainly is some inherent characteristics of laser beam quality (as spaces such as beam divergence, spectral line width, pulsewidth, time and monochromaticity characteristic) and nonlinear crystal limitation of (as allowing angular width, permission live width, discrete angular width, temperature stability etc.).
Frequency multiplication is that second harmonic produces the abbreviation of (SHG), is in the three ripple coupling process and a kind of special case frequently.The mathematical notation of its mechanism is
Wherein, λ
1Be fundamental wave, promptly by the laser of frequency conversion; λ
2It is exactly frequency doubled light.This shows, under the SHG situation, λ
1=2 λ
2
Its physical process is, as two bundle fundamental wave λ
1During nonlinear optical crystal sheet by having required to process according to phase matching, because three ripples coupling (λ
1, λ
1, λ
2) act on and generation frequency doubled light λ
2Under lower powered situation, the relation of its frequency-doubling conversion efficiency η and phase matching is by relational expression
Determine.In the formula, Δ K is the phase mismatch factor, P
λ 1Be first-harmonic λ
1Optical power density, L is the logical light length of nonlinear crystal, d
EffIt is the effective Clock Multiplier Factor when under the setted wavelength condition, satisfying phase matching.The geometric relationship of phase mismatch factor K and phase matching angle under the first approximation situation is
ΔK∝(Δθ)
2。
Here, the Δ θ permission angle of above-mentioned said crystal (or claim acceptance angle, allow the angle) width just.One of them optimal cases is, when Δ KL/2 → 0, and phase factor (sin (Δ KL/2)/Δ K L/2)
2→ 1, it is maximum that shg output power can reach.This shows phase factor in fact also we can say to be exactly that the influence of mismatch factor pair frequency-doubling conversion efficiency η is very big.Such as, when want frequency multiplication certain have≤laser beam of 3mrad divergence (as commercial Nd:YAG laser beam) time, if adopt the acceptance angle width to have only the BBO about 1mrad or the words of KDP crystal, just might will cause luminous energy over half to slattern, if adopt acceptance angle 5mrad probably to be arranged (to λ owing to not satisfying phase-matching condition
1≈ 1um) lbo crystal just can be retrieved the loss of this part energy substantially, thereby improve frequency-doubling conversion efficiency.; for picture LD laser beam; or the various laser beams by optical fiber coupling output; perhaps various laser beams by strong focusing output; divergence is all very big, the angle of divergence of 0.1-1rad. is generally all arranged, at this moment; the acceptance angle of any nonlinear optical crystal all can't satisfy so harsh requirement, has only the design by the nonlinear crystal device to solve problem.This invention is exactly a kind of technology settling mode that proposes for this reason and implement.
The design philosophy of device of the present invention, based on nonlinear optical crystal in laser frequency, on the one hand because the birefringence effect of crystal, phase matching angle (being assumed to be θ m) mismatch to a certain specific optical maser wavelength is very sensitive, bring for the frequency conversion conversion efficiency has a strong impact on, as above shown in the row expression, the output of expression harmonic wave is little with overall with half maximum (FWHM) width of the permission angle Δ θ of one of phase matching angle relation., the position angle (being assumed to be φ) during on the other hand by the phase matching of nonlinear crystal structure space symmetry decision is to the influence of phase matching, compares just insensitively with Δ θ, and that its influence mainly is effective Clock Multiplier Factor d of crystal
EffFor example, for the single shaft optical crystal that point group is 32, the effective nonlinear coefficient under its I class and the II class phase matching situation can be expressed as respectively
(d
eff)
1＝d
11?cosθ?cos3φ，
(d
eff)II＝d
11?cos
2?θcos3φ。
Clearly, azimuthal influence mainly shows the orientation angular width of intensity, and this space factor is very low to the adjusting influence of phase matching angle.
θ represents wave vector
The angle of z axle among direction and the crystal refractive index main shaft coordinate system oxyz, φ represents wave vector
Component on the xoy plane is with the angle of x axle, and we call the position angle to it here.
In view of the above, in the frequency multiplication process at the bigger laser beam of divergence, consider at the bidimensional (θ of nonlinear crystal perpendicular to incident light, φ) on the logical optical plane, to wherein one dimension θ is very sensitive in phase matching, it has strict interdependent each other relation by the crystal birefringence decision with wavelength; And not too responsive to the relation of angle to another dimension φ, it and birefringence have nothing to do, thereby and Wavelength-independent, it is the geometrical factor by the geometric space structures shape.This characteristic of nonlinear optical crystal shows, in the frequency doubling device design, can make full use of the φ angle to the very little fact of phase matching angle influence, non-linear frequency-doubling crystal is divided into several sections (several), the certain angle that simultaneously these wafers rotated relative to one another makes and departs from θ dimension direction and do not obtained frequency multiplication by the fundamental wave of frequency multiplication on φ dimension direction.
Another problem that the present invention can take into account simultaneously solution is, can suitably overcome the unthreaded hole effect (also claim straggling effect, or walk-off effect) of nonlinear optical crystal.This effect is the fundamental wave that causes of the effects such as birefringence of crystal itself and the discrete phenomena between the frequency doubled light, and it has not only limited intracrystalline effective interaction length, and can have a strong impact on the conversion efficiency of frequency multiplication and the beam quality of harmonic wave output equally.
Discrete phenomena is because radiation direction and wave normal direction different, causes input beam (fundamental wave) and exports light (frequency doubled light) light beam and separate certain angle in crystal---often it is referred to as walk-off angle ρ, also is referred to as the phenomenon of deviation angle.When the first-harmonic direction of light
The time, frequency multiplication direction of light ρ
2On the normal direction of ellipsoid refractive index face, ρ
1, ρ
2Between angle---ρ is directly influenced by nonlinear crystal birefraction size, and birefraction is big more, and ρ is big more; Different fundamental waves are corresponding to different phase matching angle θ
m, and the angle value of ρ value and phase matching angle has certain relation, general
ρ∝sin2θ
m。
Walk the adverse effect of bringing from phenomenon in order to overcome, except in the only a few nonlinear optical crystal, adopting noncritical phase matching (NCPM) technology avoided, can only realize the nonlinear optical crystal of frequency conversion by critical phase place matching process for great majority, can the frequency multiplication effect is improved, the what is called that Here it is has been applied be walked from mending the reward technology.Walk from the principle of mending reward, be to adopt two to walk from the strict identical and isometric a pair of crystal wafer of direction opposite phases matching angle, make walking that light beam produces in last crystal, can in the identical crystal of back a slice light path, just obtain mending the technology of reward (rectification) from degree.In fact, the cutting angle and the identical crystal wafer of logical light length of two same material crystal before and after being exactly, the very polarized light that in device, is configured to make their Z axle to be placed to make fundamental wave with respect to the incident light direction to depart from trend opposite, thereby be mutually 2 ρ ° angle.In like manner, the Overlay of frequency doubling device of the present invention in fact also can play same part and mend the reward effect.This is mended reward effect and has the effective interaction length L of increase light beam in nonlinear crystal again naturally, from and efficiency eta is improved, this can be from above-mentioned efficiency eta relational expression (η ∝ L
2) come as can be seen.
Summary of the invention
The present invention is directed to nonlinear optical crystal some inherent defects in laser frequency, according to except by the little limitation of the phase matching acceptance angle of birefringence decision, also have the big characteristics of acceptance angle by the decision of space structure symmetry, utilize nonlinear crystal sheet stack combinations method, invent a kind of intersection superimposed type crystal frequency multiplier device that is specially adapted to the bigger LASER Light Source enforcement frequency multiplication of beam divergence, and constructive method.
At first, clear and definite frequency multiplication object and requirement, the laser beam of implementing frequency multiplication at needs belong to divergence really, and bigger (〉=10mrad) LASER Light Source is as the LD semiconductor laser, or any laser, or the laser beam by optical fiber coupling output through strong focusing output.
Secondly, the optical maser wavelength of frequency multiplication is as required selected the nonlinear optical crystal that is suitable in numerous inorganic, organic, solvay-types or semiconductor crystal.That is, select a kind of nonlinear crystal that all meets the demands from parameters such as transparency range, phase matching scope, effective Clock Multiplier Factor, laser power density ability to bear and moisture resistances.Such as, for mid-infrared laser, select semiconductor nonlinear crystals such as HgGa2S4 for use; Except selecting for use semiconductor dies such as AsGaS external, also can select inorganic nonlinear crystals such as KTP, KTA, LiNO3 for the near-infrared laser frequency multiplication for use; Frequency multiplication near infrared-visible region, can select inorganic nonlinear crystals such as KN, BBO, LBO, CLBO, KTP, KTA, LiIO3, LiNO3 for use, also can select organic non-linear crystal such as POM, p-MHB for use, or select solvay-type nonlinear crystals such as CMTC, ZCTC for use; Frequency multiplication for visible light-ultraviolet region can be selected inorganic nonlinear crystals such as BBO, CLBO, KBBF, SBBO, Urea for use.
Be to calculate once more,, by calculating the type of determining phase matching, and calculate the respective phase matching angle according to frequency multiplication wavelength of determining and selected nonlinear crystal.We notice, choice of crystals considers when in fact wanting suitable with calculating, and mainly are to consider for the influence to effective Clock Multiplier Factor size of different frequency multiplication wavelength and phase matching type.
Then, according to the result of calculation of phase matching angle,, accurately directed to the crystal of determining to select for use with X-ray diffraction direction finder---accurately make the phase matching direction of frequency multiplication.Then the nonlinear crystal of selecting for use is cut, processes the rectangle cylinder blank piece material of frequency doubling device, and guarantee that the cylinder xsect is perpendicular to the logical light face of phase matching direction, verticality requirement＜5 ' of cylinder seamed edge and logical light face according to directed result.On this basis, this cylinder body crystal block is parallel to the crystal microchip that logical light face cuts out some, its thickness can be selected in the 0.1-10mm scope, after this all crystals sheet is polished out logical light face on same polishing disk.Add man-hour (from cut-polish-unload the whole process of dish-packing), must live each crystal wafer relative position of seamed edge each other by mark so that when combination is installed for the identification in orientation.
As according to directed result with the cutting of the nonlinear crystal selected for use, process the cylinder blank piece material of frequency doubling device, need depict a level line in the right cylinder side, arrange the reference signs that concerns between each crystal wafer during as assembly device.
For the nonlinear optical crystal that is difficult to obtain quality block, can not cut out the blank piece material of cylinder body shape, some (generally be difficult to grow new material) can only be directed piecewise, grind out the polylith crystal wafer perpendicular to the phase matching direction, at this moment requires to begin to note from directed operation the mark of some crystallographic axis orientation each crystal wafer or growth rib; Some crystal (as, KBBF) even can't grind out logical light face perpendicular to the phase matching direction, at this moment can only be just with this crystal self-sow face as logical light face, same, will live its growth rib orientation by mark at the beginning, so that identification during combination.
Be the frequency-doubling crystal sheet that these are polished at last, adopt a kind of array mode (tightly bonding or near) to be arranged in order and form a complete intersection superimposed type nonlinear crystal frequency multiplier device.Array mode can be to adopt the mechanical type stationary arrangement, also can adopt gummed, or adopts any mode such as optical cement.In these crystal wafers are glued together, the seamed edge mark (as shown in Figure 1) that must the reference crystal sheet adds man-hour, accomplish to make the seamed edge of every crystal wafer to have a certain degree mutually, when crystal wafer sheet number only has two, at 45 mutually each other when marked seamed edge is mutually 90 ° 4 each other
Finish after the making of this intersection superimposed type nonlinear crystal frequency multiplier device through above steps, this device is placed divergence, and big (〉=10mrad) laser beam beam waist position is implemented frequency multiplication.Because it has taken into account the phase-matching condition of solid angle scope up and down, thereby is easy to observe the frequency multiplication phenomenon, just can obtain satisfied frequency multiplication effect after the further adjustment through phase matching again.When also the frequency multiplication output beam not being coupled the output straightening, just can observe the colored type hot spot of given shape, as shown in Figure 2, the hot spot when only with 2 crystal wafers is similar cross hot spot; Hot spot when with 4 crystal wafers then is similar to 8 hemp nettle types of snowflake type; And be yi word pattern as conventional hot spot during with 1 nonlinear crystal sheet.These flower type hot spots have been enough to illustrate the effect of intersection superimposed type nonlinear crystal frequency multiplier, as long as the crystal wafer of some is arranged, the laser beam that it just can be big with divergence almost the luminous energy in whole omnibearing stereo angular region all " collection " get up to realize frequency multiplication output.
By the nonlinear crystal frequency multiplier that this method is made, both can improve the conversion efficiency of laser freuqency doubling, can improve the quality of frequency conversion light light beam again.Simultaneously can make the big nonlinear optical crystal of birefraction (this crystal-like nonlinear optical effect is often big especially) be opened up application widely.In addition, intersect superimposed type laser crystal frequency multiplier in assembling, when using, far from can be so strict to the requirement that phase matching is regulated as the monolithic crystal frequency conversion device.
Description of drawings
Fig. 1 is bbo crystal intersection superimposed type nonlinear crystal frequency multiplier synoptic diagram.1 is the input beam (fundamental wave) of frequency multiplier front; 2 is the first bbo crystal sheet; 3 is the second bbo crystal sheet; Identical for guaranteeing orientation each other, 2 and 3 two bbo crystals all are according to the requirement of phase matching (θ=25.1 °, what φ=0 °) cutting processing was come out on the directed appropriate same bbo crystal, the crystal edge orientation of accomplishing them is corresponding one by one each other, and " orientation " between the two crystal wafer crystal edges is mutually 90 ° with the arrow signal
Fig. 2 is the synoptic diagram that concerns between nonlinear crystal frequency multiplier output facula pattern and the crystal wafer sheet number.Hot spot pattern when wherein, (a) and (b), (c) represent respectively only to implement frequency multiplication by 1,2,4 crystal wafer.
Embodiment
Embodiment one usefulness bbo crystal is made intersection superimposed type nonlinear crystal frequency multiplier, and frequency multiplication 940nmLD laser Vernonia parishii Hook degree laser beam realizes blue light output.
Select the bigger typical inorganic nonlinear crystal of birefraction for use---bbo crystal is as an example, and makes intersection superimposed type laser crystal frequency multiplier in the frequency conversion laser device with I class phase matching form.Determined that at this we calculate, effective Clock Multiplier Factor d of crystal under situation of specific wavelength and match-type
Eff=1.42 (pm/V) allow angular width δ θ=0.778 (mrad-cm), allow wavelength bandwidth δ λ=0.5935 (nm-cm), and walk-off angle ρ=3.417 (deg.), and phase matching angle is θ=25.1 (deg.), φ=0 (deg.).According to result of calculation; orientation, cutting, grinding, shaping, polish out 4 bbo crystal sheets (size of crystal wafer is 5 x, 5 x 3mm); and the logical light face of every crystal all plated after the moisture protection anti-reflection film, become one by the assembling of the signal among Fig. 1 and intersect the superimposed type laser crystal frequency multiplier situation of two crystal wafers (only illustrate among the figure).Assembling mode is the mechanical arrangement stack, and adopting this stacked system is in order to help research, expression device different conditions of the present invention (different crystal sheet sheet number) pattern and the power of frequency multiplication output facula down.
Place laser waist shown in Figure 1 to implement frequency multiplication with the above-mentioned intersection superimposed type bbo crystal frequency multiplier that assembles.The hot spot image picture of frequency doubled light output as shown in Figure 2.Owing to adopt in this enforcements the mechanical system assembling fixing, therefore very convenient frequency multiplication effect---the hot spot pattern and the shg output power of output when observing 1,2 and 4 respectively.The frequency doubled light output power that records when different crystal sheet sheet is counted is listed in the table below.As seen from the table, the frequency multiplication effect of superimposed type crystal frequency multiplier of intersecting is significant, also explanation simultaneously, and this device of the present invention makes the big nonlinear crystal of birefraction can be used for the big laser beam of frequency multiplication divergence equally.Here illustrate in passing that in the invention process example, the live width of the LD LASER Light Source of use is all than broad, foot has 〉=4nm, is far longer than the permission wavelength bandwidth δ λ of crystal.
| Crystal wafer number (sheet number) | 1 | 2 | 4 |
| Frequency doubled light output power (mW) | 7.2 | 12.6 | 18.2 |
Embodiment two selects for use the novel non-linearity crystal GAB crystal of growth recently to make intersection superimposed type nonlinear crystal frequency multiplier, and frequency multiplication realizes blue light output by the 940nm LD laser beam of optical fiber coupling output.The LD light source that uses is identical with embodiment one.
The GAB crystal is new frequency-doubling crystal material, implement also not have to provide in the present invention and make the block size crystal of meaning device in the past, therefore, processing two crystal wafers respectively with the small size crystal wafer of this crystal (adds and only need remember its certain feature growth rib orientation man-hour, just can when making up them, hold their relative orientation relation for device), be combined into an intersection superimposed type nonlinear crystal frequency multiplier with these two crystal wafers then.This crystal belongs to the single shaft optical crystal, and we make frequency multiplier with I class phase matching form.Under this specific wavelength and match-type situation, we are through calculating effective Clock Multiplier Factor d of crystal
Eff=1.199 (pm/V) allow angular width δ θ=1.138 (mrad-cm), allow wavelength bandwidth δ λ=0.5911 (nm-cm), and walk-off angle ρ=2.365 (deg.), and phase matching angle is θ=33.65 (deg.), φ=0 (deg.).According to result of calculation, revising the logical light face of crystal wafer is the logical light face of phase matching, shaping, polish out 2 GAB crystal wafers (size of crystal wafer is 5 x, 4 x 2mm), the logical light face of every crystal is all plated after the anti-reflection film, become by the array mode assembling of the signal of Fig. 2 and intersect superimposed type laser crystal frequency multiplier.Assembling mode is the mechanical arrangement superposing type.
Place laser waist shown in Figure 1 to implement frequency multiplication the appropriate intersection superimposed type GAB crystal frequency multiplier of assembling.The hot spot image of frequency doubled light output looks like as shown in Figure 2 its frequency doubled light output power.Output power when mechanical stack is convenient to observe monolithic, two crystal wafers, under the fundamental power same case, the shg output power when recording monolithic, two stacks is respectively 4.5mW and 7.8mW.Show that this device of the present invention also can make the little nonlinear crystal of size be fully used, of great use for the application prospect of exploring new material stage sign nonlinear crystal.
Claims (7)
1, intersection superimposed type laser crystal frequency multiplier is characterized in that: frequency multiplier is by two or two above nonlinear optical crystal sheets, and according to being mutually certain angular relationship, stacked system is formed before and after adopting with the logical light face seamed edge of phase matching; This angular relationship is to make the angular relationship of any one identical crystallographic axis between the projection on the logical light face of each crystal wafer phase matching of each crystal wafer of frequency multiplier, and its numerical relation is to guarantee that at first this projection on each crystal wafer does not overlap; Next is that this projection on each crystal wafer requires to be mutually each other the angular relationship of 180 °/n no matter the sheet number of crystal wafer is an odd or even number, and wherein n is the sheet number of crystal wafer.
2, intersection superimposed type laser crystal frequency multiplier as claimed in claim 1, it is characterized in that: described stacked system is a mechanical type stationary arrangement mode, or adopts the gummed mode, or adopts the optical cement mode.
3, intersection superimposed type laser crystal frequency multiplier as claimed in claim 1 or 2, it is characterized in that: described nonlinear optical crystal is the mineral crystal of various crystal class, or organic crystal, or the metal ion complex crystal, or self frequency-changing's crystal.
4, as the described intersection superimposed type laser crystal frequency multiplier of claim 1 or 2, it is characterized in that: the phase matching form of its frequency conversion is the I class, or is the collinear phase matching form of II class.
5, the preparation method of the intersection superimposed type laser crystal frequency multiplier of claim 1, it is characterized in that: accurately directed the crystal of determining to select for use, guarantee that the cylinder xsect is perpendicular to the logical light face of phase matching direction, verticality requirement＜5 ' of cylinder seamed edge and logical light face, then according to directed result's cutting, process the rectangle cylinder blank piece material of frequency doubling device, this cylinder body crystal block is parallel to the crystal microchip that logical light face cuts out some, polish out the logical light face of phase matching, add and to live each crystal wafer relative position of seamed edge each other by mark man-hour, adopt the mechanical type stationary arrangement, or adopt and glue together, or adopt wherein a kind of mode of optical cement that these crystal wafers are glued together, the reference crystal sheet adds the seamed edge mark in man-hour when bonding, makes the seamed edge of every crystal wafer be mutually the angle of 180 °/n.
6, the purposes of claim 1 or 2 intersection superimposed type laser crystal frequency multiplier, it is characterized in that: this frequency multiplier is used for the direct frequency multiplication of the LD laser of any output form.
7, the purposes of claim 1 or 2 intersection superimposed type laser crystal frequency multiplier, it is characterized in that: this frequency multiplier is used for the direct frequency multiplication of the laser beam of any divergence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310115261XA CN100492149C (en) | 2003-11-27 | 2003-11-27 | Cross stacked laser crystal frequency doubler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310115261XA CN100492149C (en) | 2003-11-27 | 2003-11-27 | Cross stacked laser crystal frequency doubler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1622402A CN1622402A (en) | 2005-06-01 |
| CN100492149C true CN100492149C (en) | 2009-05-27 |
Family
ID=34760365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200310115261XA Expired - Fee Related CN100492149C (en) | 2003-11-27 | 2003-11-27 | Cross stacked laser crystal frequency doubler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100492149C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047668A (en) * | 1990-06-26 | 1991-09-10 | Cornell Research Foundation, Inc. | Optical walkoff compensation in critically phase-matched three-wave frequency conversion systems |
| EP0649049A2 (en) * | 1993-10-19 | 1995-04-19 | International Business Machines Corporation | Wavelength converting device |
| JP2003262895A (en) * | 2002-03-11 | 2003-09-19 | Central Res Inst Of Electric Power Ind | Sum frequency generating method, tunable laser light generating method and differential absorption laser radar measuring method using the same, sum frequency generating device, tunable laser device using the same, and differential absorption laser radar |
-
2003
- 2003-11-27 CN CNB200310115261XA patent/CN100492149C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047668A (en) * | 1990-06-26 | 1991-09-10 | Cornell Research Foundation, Inc. | Optical walkoff compensation in critically phase-matched three-wave frequency conversion systems |
| EP0649049A2 (en) * | 1993-10-19 | 1995-04-19 | International Business Machines Corporation | Wavelength converting device |
| JP2003262895A (en) * | 2002-03-11 | 2003-09-19 | Central Res Inst Of Electric Power Ind | Sum frequency generating method, tunable laser light generating method and differential absorption laser radar measuring method using the same, sum frequency generating device, tunable laser device using the same, and differential absorption laser radar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1622402A (en) | 2005-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Le Targat et al. | 75%-efficiency blue generation from an intracavity PPKTP frequency doubler | |
| Lin et al. | The nonlinear optical characteristics of a LiB3O5 crystal | |
| Smith | Crystal nonlinear optics: with SNLO examples | |
| US6330256B1 (en) | Method and apparatus for non-dispersive face-cooling of multi-crystal nonlinear optical devices | |
| US5500865A (en) | Phased cascading of multiple nonlinear optical elements for frequency conversion | |
| CN104267557B (en) | Non-collinear efficient frequency conversion achievement method | |
| Lin | Non-linear crystals for tunable coherent sources | |
| EP3631577B1 (en) | Nonlinear crystal | |
| EP1180717B1 (en) | Optical harmonic generator | |
| CN100492149C (en) | Cross stacked laser crystal frequency doubler | |
| Zondy et al. | Walk-off-compensated type-I and type-II SHG using twin-crystal AgGaSe2 and KTiOPO4 devices | |
| CN207895209U (en) | A kind of frequency tripling optical frequency converter | |
| CN101459317A (en) | Frequency multiplier for wave-guide structure and manufacturing method thereof | |
| CN101572382B (en) | Laser I-type phase matching nonlinear sum frequency device | |
| CN102545019B (en) | Deliquescence-resistant ultraviolet frequency tripling crystal, preparation method and application | |
| US6882465B1 (en) | Tunable frequency-converting optical device | |
| Kato et al. | Accurate Sellmeier equations for AgGaS2 in the 0.565-10.6321 μm spectral range | |
| JPH06265956A (en) | Optical wavelength conversion method | |
| Lin et al. | Generation of deep-UV sources (160-250 nm) by frequency mixing in lithium-triborate crystal | |
| JP3884197B2 (en) | Fabrication method of domain-inverted structure | |
| CN201303203Y (en) | Crystal frequency multiplier | |
| US20250060650A1 (en) | Nonlinear optical crystal structure | |
| CN114114782B (en) | Phase matching method based on interface proximity effect | |
| CN210490073U (en) | Laser oscillator | |
| CN116679507A (en) | Preparation method of large-caliber ultraviolet tripler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CRYSTECH INC. Free format text: FORMER OWNER: FUJIAN INSTITUTE OF RESEARCH ON THE STRUCTURE OF MATTER, CHINESE ACADEMY OF SCIE Effective date: 20110131 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 350002 NO.155, YANGQIAO WEST ROAD, FUZHOU CITY, FUJIAN PROVINCE TO: 266100 ELECTRONICS INFORMATION INDUSTRIAL PARK, XIANSHAN EAST ROAD, CHENGYANG DISTRICT, QINGDAO CITY |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20110131 Address after: 266100 Qingdao city Chengyang district Mountain Road Electronic Information Industrial Park Patentee after: Qingdao Haitai Photoelectric Technology Co., Ltd. Address before: Fuzhou City, Fujian province 350002 Yangqiao Road No. 155 Patentee before: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Scie |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20141127 |
|
| EXPY | Termination of patent right or utility model |