CN100335963C - Two dimensional quasi periodic photon crystal with multidirectional multiple wavelength quasi phase match frequency multiplication - Google Patents
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Abstract
The present invention relates to a two-dimensional quasi-period photonic crystal with multidirectional multi-wavelength quasi-phase matching frequency multiplication. Two-dimensional n-tuple quasi-period patterns are formed on the surface of a ferroelectric crystal material by transfer printing, and the crystal is polarized by adding high-pressure pulse and then is made into a polarization reversal column after the superlattice lattice point of the crystal is polarized; a superlattice shape forms two-dimensional n-tuple quasi-crystal arrangement, and a reciprocal vector corresponding to the superlattice also forms a two-dimensional n-tuple quasi-crystal shape. The direction of polarization of the crystal is parallel to the central axis of a two-dimensional quasi-crystal structure. The photonic crystal can multiply frequencies of multiple beams of light waves with different wavelength in different angles and can simultaneously obtain the same result by rotating a definite angle; therefore, the present invention reduces the sensitivity of the conversion efficiency in frequency conversion to angles. The utilization of the high-tuple symmetric two-dimensional quasi-crystal structure can establish definite theory and experiment foundation for realizing the conversion of the frequency multiplication of quasi-continuous wavelength.
Description
Invention field
The present invention relates to a kind of two dimension non-linear photon crystal quasi-periodicity, particularly relate to a kind of accurate phase matching photonic crystal of multi-direction multi-wavelength frequency multiplication.
Background technology
Usually the frequency-doubled effect in the crystal is subjected to having a strong impact on of crystalline dispersion relation, makes to exist certain phase velocity poor between fundamental wave and the harmonics, causes the alternate of direction of energy flow, makes second harmonic intensity along The interaction distance L=λ
i/ 4 (n
o-n
i) (wherein, n
iAnd n
oBe respectively the refractive index of fundamental frequency light and frequency doubled light in the crystal, λ
iBe the fundamental frequency light wavelength) periodically strengthen and weaken.In order to realize second harmonic intensity continuing to increase in whole crystal, need to satisfy phase-matching condition between two wave vectors.The past people mainly utilize the birefringent characteristic of aeolotropic crystal, by regulating the angle of crystal temperature effect and incident light, the o light (or e light) of first-harmonic are equated to realize phase matching with the refractive index of the e light (or o light) of harmonic wave.But this method of utilizing the aeolotropic crystal birefringent characteristic to realize phase-matching condition has many shortcomings that are difficult to overcome: can't realize this phase matching relation in (1) natural or artificial isotropic body; (2) the caused straggling effect of phase matching on some angle has limited the space overlapping of two light beams, and the utilization of the maximum diagonal element of non-linear susceptibility is very restricted; (3) crystal is subjected to the influence of temperature characterisitic specific (special) requirements.Described above shortcoming has all greatly reduced the scope and the energy conversion efficiency of used crystal.Since accurate phase matching (QPM) technology conception was suggested, it obtained numerous researchers' concern always in the application aspect the non-linear frequency conversion.The QPM technology can make second harmonic intensity keep increasing continuously in nonlinear crystal, and it is by making the relative phase counter-rotating in the length of odd number L of first-harmonic and harmonic wave, to realize that second harmonic intensity is continued in some zones that should decay to increase.Therefore, as long as the direction of periodic variation spontaneous polarization square realizes the phase cycling sex reversal, just can make harmonic wave keep efficient non-linear frequency conversion.The advantage of QPM technology is: at first, it no longer requires orthogonal beams, and promptly importing light can be consistent with the crystal polarised direction with the output light polarization direction, and walk-off effect no longer exists like this, can make full use of the maximum nonlinear factor of crystal; Secondly, this technology is that a kind of artificial design crystal periodic structure satisfies the technology that phase matching concerns to reach, and has strengthened the controllability of design process.Based on this, the conversion efficiency in the accurate phase matching frequency inverted in non-linear photon crystal (frequency multiplication and frequency, difference frequency and optical parameter process etc.) significantly improves.
The quasi-phase matching in one dimension cycle is quite ripe at present, and wherein periodic polarized nonlinear optical crystal has been configured in the laser instrument product of multifrequency or frequency modulation.Because different application requirements, people further expand to the research to one dimension quasi-periodic structure non-linear photon crystal.This structure can realize the not frequency multiplication and the transfer processes such as frequency and difference frequency of wavelength of the same race on single direction.Yet its deficiency is not to be utilized perpendicular to the reciprocal lattice vector on the incident laser direction.French scientist V.Berger in 1998 have proposed notion (document 1, V.Berger, " Nonlinear Photonic Crystals ", PhysicalReview Letters, 1998,81 (19): 4136-4139) of two-dimension non linearity photonic crystal first.It is with the structural cycle ground counter-rotating of spontaneous polarization square with two-dimentional lattice point, forms two-dimentional polarization structure, and its first Brillouin zone can be polygons such as triangle and square.This structure can provide the multiple reciprocal lattice vector that satisfies accurate phase matching.2000, people such as Broderick (document 2, N.G.R.Broderick, G.W.Ross, H.L.Offerhaus, D.J.Richardson, and D.C.Hanna, " Hexagonally Poled Lithium Niobate:A Two-Dimensional NonlinearPhotonic Crystal ", Physical Review Letters, 2000,84 (19): 4345-4348.) adopt the two-dimension non linearity photonic crystal successfully to carry out the experiment of two frequency-doubled effects in the periodic polarized lithium columbate crystal of hexagon.
Summary of the invention
The objective of the invention is to overcome in the prior art in the one-dimensional nonlinear photonic crystal can only be to the light wave frequency multiplication of wavelength of the same race not on the single direction, reach the finiteness of reciprocal lattice vector quantity in the two-dimensionally periodic structure, for the light wave to different wave length on the light wave of multi beam different wave length on the different directions and the same direction simultaneously carries out frequency multiplication, provide a kind of two-dimentional accurate phase matching non-linear photonic crystal of many ripples frequency multiplication.Utilize the symmetry advantage of the heavy quasicrystal structure of two-dimentional n to reduce that harmonics light produces efficient departs from desirable accurate phase matching angle to incident fundamental frequency light susceptibility in the frequency conversion.Simultaneously, utilize and to have high heavy symmetric two dimensional quasicrystal structure and can be the frequency-doubled conversion that realizes quasi-continuous wavelength and establish certain theory and experiment basis.
The object of the present invention is achieved like this:
Two-dimentional quasi-periodicity of photonic crystal with the accurate phase matching frequency multiplication of multi-direction multi-wavelength of the present invention is the ferroelectric crystal material; It is characterized in that, transfer printing becomes the heavy quasi-periodic pattern of two-dimentional n on this ferroelectric crystal material+c surface, the counter-rotating cylinder that its superlattice lattice point forms for the polarization of plus high-pressure impulse electric field, the superlattice in the positive lattice vector of described photonic crystal space are shaped as two-dimentional n and weigh shape quasi-periodicity, has the heavy symmetry of n along its central shaft rotation, its elementary cell is adjacent polygon, and the wherein polygonal length of side equates; It also is that two-dimentional n weighs shape quasi-periodicity that the reciprocal lattice vector of described superlattice correspondence distributes, and not only has the reciprocal lattice vector of different length in such reciprocal lattice vector space on same direction, and also has the reciprocal lattice vector of different length in different directions; Described ferroelectric crystal material is lithium niobate or phosphoric acid potassium titanate; Described n heavily is n=8,10,12,15,16,17,24 or 25.
A kind of two-dimentional n with accurate phase matching frequency multiplication of multi-wavelength on the multiple direction provided by the invention weighs non-linear photon crystal quasi-periodicity, with the ferroelectric crystal material is base, the polarization reversal pillar that its superlattice lattice point is made for the high-pressure pulse electric polarization process, the positive lattice vector space superlattice of this non-linear photon crystal are shaped as the heavy quasi-periodic structure of two-dimentional n, along its central shaft is that the rotation of z axle has the heavy symmetry of n, wherein forming elementary cell is adjacent polygon, and the polygonal length of side equates; The reciprocal lattice vector of its superlattice correspondence also is that two-dimentional n weighs distribution of shapes quasi-periodicity, and such reciprocal lattice vector space has the reciprocal lattice vector of different length on same direction, also has the reciprocal lattice vector of different length simultaneously in different directions.
Thus, can utilize in such non-linear photon crystal that the reciprocal lattice vector of different length realizes the not conllinear and the accurate phase matching frequency multiplication of the non-colinear process of wavelength of the same race on the different directions, and utilize the rotational symmetry of two dimension crystal quasi-periodicity, behind the integral multiple that its central shaft rotates to an angle, can obtain identical result.
It is to utilize the method for extra electric field to be prepared out that a kind of two-dimentional n with accurate phase matching frequency multiplication of multi-wavelength on the multiple direction provided by the invention weighs the quasi-periodicity non-linear photon crystal, and this method comprises the steps:
(a). at first prepare the mask that photoetching process with the heavy quasi-periodic pattern of two-dimentional n is used;
(b). be coated with a layer photoetching insulating gel on clean ferroelectric crystal material+c surface then, utilize the photoetching process mask of step (a) preparation, the heavy quasi-periodic pattern of two-dimentional n is transferred on ferroelectric crystal material+c surface by photoetching process;
(c). polarization: adopt the lithium chloride liquid electrode, the liquid electrode that makes the lithium chloride supersaturated solution be not capped lithium columbate crystal or phosphoric acid potassium titanate part and fully contact and polarize, the high-pressure pulse electric of 10～30kV/mm is applied to is not insulated the zone that glue covers on ferroelectric crystal material+c that surface that step (b) obtains has the heavy quasi-periodic pattern of two-dimentional n and polarizes, make this regional ferroelectric crystal material+c be polarized the polarization reversal cylinder that its superlattice lattice point is made for the high-pressure pulse electric polarization process; The central axes of the polarised direction of crystal and two dimensional quasicrystal structure, described n heavily is n=8,10,12,15,16,17,24 or 25;
(d). crystal is in the insulating oil carries out;
(e). after polarization is finished, wipe the photoetching insulating gel on ferroelectric crystal material+c surface, can obtain having two-dimentional n and weigh non-linear photon crystal quasi-periodicity; Described ferroelectric crystal material is lithium niobate or phosphoric acid potassium titanate.
For preventing high pressure to air breakdown, also being included in the polarization process all is crystal to be in the insulating oil carry out usually.
In order to obtain spot figure more clearly, also comprise step 5, select suitable etching liquid to carry out etching the plane of crystal after the polarization, for example: the lithium niobate material selects hydrofluorite to do etching liquid, promptly the lithium niobate material is placed in the hydrofluorite, at room temperature soaked 10～15 minutes, and then promptly can be observed two-dimentional clearly n at microscopically and weigh grid point distribution figure quasi-periodicity.
During use, in order to reduce of the loss of polishing plane of crystal to incident fundamental frequency light and outgoing frequency multiplication light beam, fundamental frequency light weighs plane vertical incidence on photonic crystal specific direction quasi-periodicity along two-dimentional n, and the vertical crystal outside that shines with its second harmonic conllinear, the accurate phase matching frequency multiplication of the conllinear process of realization fundamental frequency light.The linear combination that makes full use of a plurality of basic vectors in the heavy quasi-periodic structure of n can obtain abundanter reciprocal lattice vector, adopts the method can realize different wavelengths of light wave frequency conversion on more different directions.Rotation (360 °/n) integral multiple of angle can obtain identical result.
The invention provides and a kind ofly have the two-dimentional n that more enriches reciprocal lattice vector and weigh polarization reversal structure quasi-periodicity, promptly on same crystal, the reciprocal lattice vector that can satisfy accurate phase matching in multiple direction can be arranged, and the reciprocal lattice vector that can have multiple-length more not wait exists on same direction.
The two-dimentional n of a kind of multi-direction multi-wavelength frequency multiplication provided by the invention (n=8,10,12,15,16,17,24 or 25) weighs accurate phase matching photonic crystal quasi-periodicity, has following beneficial effect:
1. can be on same direction simultaneously the light wave to the multi beam different wave length carry out the accurate phase matching frequency inverted of single order, simultaneously, the linear combination by multiple basic vector can realize on the different directions the not frequency-doubled conversion of wavelength of the same race;
2. utilize the heavy symmetry of n of crystal, (360 °/n) can obtain identical result behind the integral multiple of angle of rotations;
3. utilize and have high heavy symmetric two dimensional quasicrystal structure and can be the frequency-doubled conversion that realizes quasi-continuous wavelength and provide and establish certain basis.
Description of drawings
Fig. 1 is the grid point distribution figure with the positive lattice vector of two-dimentional eightfold (n=8) photonic crystal quasi-periodicity space of the accurate phase matching frequency multiplication of multi-direction multi-wavelength of the present invention, and whole space is made up of adjacent square and 45 ° of rhombuses.Wherein, the central point that is centered close to the x-y-z coordinate system of two-dimentional eightfold figure quasi-periodicity, the rotary middle spindle of this figure overlaps with the z axle, and the vertical paper of z axle is outside; (a) and (b) for forming elementary cell square and 45 ° of rhombuses of two-dimentional eightfold quasi-periodic structure; λ
O1, λ
O2, λ
O3And λ
O4Be respectively input fundamental frequency light λ
I1, λ
I2, λ
I3And λ
I4The accurate phase matching frequency multiplication of conllinear output light.
Fig. 2 is that the method for plus high-pressure impulse electric field polarizes after the lithium columbate crystal of two-dimentional eightfold quasi-periodic structure finishes, its+shape appearance figure of c face.
Fig. 3 is the grid point distribution figure in two-dimentional eightfold quasicrystal structure reciprocal lattice vector space.Wherein, G
1And G
2For with y axle clamp angle be the reciprocal lattice vector of different length on 0 ° of direction, G
3And G
4For with y axle clamp angle be the reciprocal lattice vector of different length on ± 25 ° of directions.
Fig. 4 is the lattice distribution plan in the positive lattice vector of two-dimentional ten weights (n=10) quasi-periodic structure space, and its basic structural unit is 36 ° of thin rhombuses and 72 ° of fat rhombuses.Wherein, two dimension ten weighs the central point that is centered close to the x-y-z coordinate system of figure quasi-periodicity, and the rotary middle spindle of this figure overlaps with the z axle, and the vertical paper of z axle is outside; (a) and (b) for forming 36 ° of thin rhombuses of elementary cell and 72 ° of fat rhombuses of two-dimentional eightfold quasi-periodic structure;
Embodiment
Embodiment 1
Two-dimentional n with accurate phase matching frequency multiplication of multi-wavelength on the multiple direction weighs non-linear photon crystal quasi-periodicity, lithium niobate material with thickness 0.4mm is a base, the polarization reversal pillar of its superlattice lattice point for utilizing the method add the 23kV/mm high-pressure pulse electric to make prepared two-dimentional eightfold (n=8) farmland quasi-periodicity counter-rotating non-linear photon crystal.The positive lattice vector space superlattice of this non-linear photon crystal are shaped as two-dimentional eightfold quasi-periodic structure, are that the rotation of z axle has the eightfold symmetry along its central shaft, and wherein forming elementary cell is adjacent polygon, and the polygonal length of side equates; The reciprocal lattice vector of its superlattice correspondence also is that two-dimentional n weighs distribution of shapes quasi-periodicity, and such reciprocal lattice vector space has the reciprocal lattice vector of different length on same direction, also has the reciprocal lattice vector of different length simultaneously in different directions.The grid point distribution figure in the positive lattice vector of this two dimension eightfold (n=8) crystal quasi-periodicity space, whole space is made up of adjacent square and 45 ° of rhombuses, as shown in Figure 1; Wherein, the central point that is centered close to the x-y-z coordinate system of two-dimentional eightfold figure quasi-periodicity, the rotary middle spindle of this figure overlaps with the z axle, and the vertical paper of z axle is outside; (a) and (b) for forming the elementary cell square and the rhombus of two-dimentional eightfold quasi-periodic structure; λ
O1, λ
O2, λ
O3And λ
O4Be respectively input fundamental frequency light λ
I1, λ
I2, λ
I3And λ
I4The accurate phase matching frequency multiplication of conllinear output light.
The concrete preparation method of two-dimentional eightfold (n=8) the farmland quasi-periodicity counter-rotating non-linear photon crystal of present embodiment comprises the steps:
1. the crystal that is adopted is the lithium niobate material of thickness 0.4mm, at first makes the mask with two-dimentional eightfold lattice point quasi-periodicity structural arrangement with the method for electron beam exposure, as shown in Figure 1;
2. utilize the optical semiconductor carving technology quasi-periodic pattern on the mask to be transferred on the photoetching insulating gel on lithium columbate crystal+c surface;
3. the liquid electrode of lithium chloride supersaturated solution is fully contacted with the lithium niobate crystal body region that is not capped the photoetching insulating gel polarize, make this regional farmland be able to polarization reversal, form the polarization reversal cylinder by applying the 23kV/mm high-pressure pulse electric; And crystal is in the insulating oil to carry out;
4. after polarization is finished, wipe the insulating gel of lithium niobate crystal surface, promptly obtain two-dimentional eightfold photon crystal structure quasi-periodicity as shown in Figure 1.
In order to obtain spot figure more clearly, the crystal after also will polarizing at room temperature is immersed in the hydrofluorite etching can within 10～15 minutes.Because hydrofluorite is faster than the etch rate on-c surface for crystal+c face, promptly can be observed two-dimentional clearly n at microscopically after etching is finished and weighs grid point distribution figure quasi-periodicity, as shown in Figure 2.
The structure of present embodiment is that adjacent square (a) and 45 ° of rhombuses (b) form by rotation or translation in the x-y plane by elementary cell, the superlattice lattice point is the polarization reversal pillar that plus high-pressure impulse electric field polarization process is made, and grating constant is that the square or the rhombus length of side are 11.77 μ m.Fig. 3 provides the reciprocal lattice vector distribution plan of the two-dimentional eightfold quasicrystal structure of embodiment making, and visible grid point distribution still is that two-dimentional eightfold is arranged this reciprocal lattice vector space tool reciprocal lattice vector of more multi-direction more multiple-length quasi-periodicity.
According to given lattice period, use accurate phase matching frequency multiplication condition (
Wherein
Be reciprocal lattice vector,
With
Be respectively the wave vector of incident fundamental frequency light and outgoing frequency doubled light), draw in the present embodiment and restraint the long λ of being of fundamental light wave along two of the accurate phase matching of y direction of principal axis single order
I1=1.2048 μ m and λ
I2=1.074 μ m, the light beam trend in the crystal as shown in Figure 1.At this moment, the working temperature of photonic crystal is 24.5 degrees centigrade.Resulting optical wavelength is respectively λ after the accurate phase matching frequency multiplication of this conllinear
O1=0.6024 μ m (orange light) and λ
O2=0.537 μ m (green glow), wherein the reciprocal lattice vector that is adopted is G
1And G
2(wherein, G
1: G
2=1 ∶ ), as shown in Figure 3.The integral multiple of rotation 45 can obtain identical result, and eightfold is symmetric just demonstrates fully for this.Simultaneously, utilize the reciprocal lattice vector that becomes with the y axle on certain symmetry angle direction, can realize the accurate phase matching harmonics of the non-colinear process of multiple different wave length along y direction of principal axis incident fundamental frequency light, wherein the I in each wavelength interval reaches several nanometers.Therefore, utilize the reciprocal lattice vector of different length on the reciprocal lattice vector of same direction different length and the different directions can realize the conllinear of different wave length and the accurate phase matching frequency-doubled conversion of conllinear not.In above frequency multiplication experimentation,, need incident light and emergent light all perpendicular to the side of crystal in order to reduce the loss of incident fundamental frequency light and outgoing frequency doubled light.
Similarly, utilizing in the reciprocal lattice vector space linear combination of basic vector on four kinds of different directions, can obtain the reciprocal lattice vector of different length on more different directions, is 22.5 ° of reciprocal lattice vector G on the direction with y axle clamp angle among Fig. 3 for example
3And G
4Shown in (wherein, G
3: G
4=1+ : 1).Therefore, utilize these two kinds of reciprocal lattice vectors can realize that the fundamental frequency wavelength is λ
I3=0.988 μ m and λ
I4The accurate phase matching frequency-doubled conversion of the conllinear of=1.429 μ m, frequency doubled light is respectively λ
O3=0.494 μ m (blue or green light) and λ
O4=0.7145 μ m (ruddiness), the light beam trend in the crystal as shown in Figure 1.The integral multiple of rotation 45 can obtain identical result.
And, changing its grating constant, the required fundamental frequency wavelength of corresponding frequency multiplication also can correspondingly change, and realizes the frequency inverted of more kinds of wavelength thus.
Embodiment 2
The employing not quasicrystal structure of multiple symmetrical structure of the same race can realize in addition the not frequency inverted of wavelength of the same race.
With reference to figure 4, in the present embodiment among photonic crystal and the embodiment 1 lattice of photonic crystal be two dimension and distribute quasi-periodicity, difference is this structure distribution tool with ten weights (n=10) symmetry, as shown in Figure 4.For ten heavy quasicrystal structures, basic structural unit is the combination of 36 ° of thin rhombuses (a) and 72 ° of fat rhombuses (b), and wherein the interior angle of thin rhombus is 36 ° and 144 °, and the interior angle of fat rhombus is 72 ° and 108 °.Weighing quasicrystal structures with this two dimension that combines ten in the present embodiment is that example is analyzed.Length ratio in the accurate crystalline substance of two-dimentional eightfold between four kinds of basic vectors (being the integral multiple of y axle or rotation 45) each lattice point of direction is 1 ∶ ; In the ten heavy accurate crystalline substances on five kinds of basic vector directions the length ratio between each lattice point be
By among the embodiment 1 to the accurate brilliant research of two-dimentional eightfold as can be known, the grid point distribution in reciprocal lattice vector space is abundanter than the lattice point in positive lattice vector space.Therefore, have three kinds of reciprocal lattice vectors that are uneven in length at least on the basic vector direction in the brilliant reciprocal lattice vector space structure of ten heavy standards, this helps the generation of more kinds of fundamental frequency light harmonics processes.Simultaneously, be to exist abundant reciprocal lattice vector equally on the direction of 18 ° of degree with y axle clamp angle.Therefore, the reciprocal lattice vector of different length can realize the conllinear and the accurate phase matching frequency-doubled conversion of non-colinear of more kinds of fundamental frequency light on reciprocal lattice vector by different length on these same directions and the different directions.The integral multiple at 36 ° of angles of rotation can obtain identical result.Thus, the tuple of increase two dimensional quasicrystal can be the harmonics conversion that realizes quasi-continuous wavelength and has established certain basis.
The concrete preparation method of two dimension ten weights (n=10) the farmland quasi-periodicity counter-rotating non-linear photon crystal of present embodiment comprises the steps:
1. the crystal that is adopted is a phosphoric acid potassium titanate material, at first makes one with the method for electron beam exposure and has the mask that two dimension ten weighs lattice point structural arrangement quasi-periodicity;
2. utilize the optical semiconductor carving technology quasi-periodic pattern on the mask to be transferred on the photoetching insulating gel on phosphoric acid potassium titanate+c surface;
3. make the liquid electrode of lithium chloride supersaturated solution fully contact and polarize, make this regional farmland be able to polarization reversal, form the polarization reversal cylinder by applying the 18kV/mm high-pressure pulse electric with the phosphoric acid potassium titanate+c surf zone that is not capped the photoetching insulating gel; And crystal is in the insulating oil to carry out;
4. after polarization is finished, wipe the lip-deep insulating gel of phosphoric acid potassium titanate+c, promptly obtain two dimension ten and weigh non-linear photon crystal quasi-periodicity.
5. in order to obtain spot figure more clearly, the crystal after also will polarizing at room temperature is immersed in the potassium hydroxide of 2: 1 proportionings and the potassium nitrate mixed solution etching can within 10～15 minutes.
Claims (4)
1, a kind of two-dimentional quasi-periodicity of photonic crystal with the accurate phase matching frequency multiplication of multi-direction multi-wavelength is the ferroelectric crystal material; It is characterized in that, transfer printing becomes the heavy quasi-periodic pattern of two-dimentional n on this ferroelectric crystal material+c surface, the counter-rotating cylinder that its superlattice lattice point forms for the polarization of plus high-pressure impulse electric field, the superlattice in the positive lattice vector of described photonic crystal space are shaped as two-dimentional n and weigh shape quasi-periodicity, has the heavy symmetry of n along its central shaft rotation, its elementary cell is adjacent polygon, and the wherein polygonal length of side equates; It also is that two-dimentional n weighs shape quasi-periodicity that the reciprocal lattice vector of described superlattice correspondence distributes, and not only has the reciprocal lattice vector of different length in such reciprocal lattice vector space on same direction, and also has the reciprocal lattice vector of different length in different directions; Described ferroelectric crystal material is lithium niobate or phosphoric acid potassium titanate; Described n heavily is n=8,10,12,15,16,17,24 or 25.
2, a kind of preparation have the accurate phase matching frequency multiplication of multi-direction multi-wavelength two-dimentional quasi-periodicity photonic crystal method, it is characterized in that, comprise the steps:
(a). at first prepare the mask that photoetching process with the heavy quasi-periodic pattern of two-dimentional n is used;
(b). be coated with a layer photoetching insulating gel on clean ferroelectric crystal material+c surface then, utilize the photoetching process mask of step (a) preparation, the heavy quasi-periodic pattern of two-dimentional n is transferred on ferroelectric crystal material+c surface by photoetching process;
(c). polarization: adopt the lithium chloride liquid electrode, the liquid electrode that makes the lithium chloride supersaturated solution be not capped lithium columbate crystal or phosphoric acid potassium titanate part and fully contact and polarize, the high-pressure pulse electric of 10～30kV/mm is applied to is not insulated the zone that glue covers on ferroelectric crystal material+c that surface that step (b) obtains has the heavy quasi-periodic pattern of two-dimentional n and polarizes, make this regional ferroelectric crystal material+c be polarized the polarization reversal cylinder that its superlattice lattice point is made for the high-pressure pulse electric polarization process; The central axes of the polarised direction of crystal and two dimensional quasicrystal structure, described n heavily is n=8,10,12,15,16,17,24 or 25;
(d). crystal is in the insulating oil carries out;
(e). after polarization is finished, wipe the photoetching insulating gel on ferroelectric crystal material+c surface, can obtain having two-dimentional n and weigh non-linear photon crystal quasi-periodicity; Described ferroelectric crystal material is lithium niobate or phosphoric acid potassium titanate.
3, two-dimentional quasi-periodicity of the photonic crystal method that has the accurate phase matching frequency multiplication of multi-direction multi-wavelength by the described preparation of claim 2, it is characterized in that, comprise that also step (f) carries out etching to the lithium niobate photon crystal surface, with the lithium niobate photonic crystal after the polarization at room temperature, be immersed in the hydrofluorite 10～15 minutes and carry out surface etch.
4. two-dimentional quasi-periodicity of the photonic crystal method that has the accurate phase matching frequency multiplication of multi-direction multi-wavelength by the described preparation of claim 2, it is characterized in that, comprise that also step (f) carries out etching to phosphoric acid potassium titanate photon crystal surface, phosphoric acid potassium titanate photonic crystal after the polarization was placed in the etching liquid etching 10～15 minutes, and described etching liquid is the potassium hydroxide and the potassium nitrate mixed solution of 2: 1 proportionings.
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Non-Patent Citations (3)
| Title |
|---|
| Multiple-wavelength second-harmonic generationsinatwo-dimensional periodically poled lithium niobate PEIGEN.LI ET AL,OPTICS COMMUNICATIONS,Vol.第233卷 No.第1.3期 2004 * |
| Nonlinear physical optics with transverselypatternedquasi-phase-matching gratings JONATHAN R.KURZ ET AL,IEEE JOUNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS,Vol.第8卷 No.第3期 2002 * |
| Periodically poled lithium niobate andquasi-phase-matchedoptical parametric oscillators Lawrence E.Myers,IEEE JOUNAL OF QUANTUM ELECTRONICS,Vol.第33卷 No.第10期 1997 * |
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