CN102087454A - Method for tuning and widening second order nonlinear bandwidth on basis of superlattice device - Google Patents
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Abstract
The invention relates to a method for tuning and widening a second order nonlinear bandwidth on the basis of a superlattice device. In the method, sector polarized optical superlattices are used as nonlinear crystals and a mode of regulating an position and an angle is adopted, so that the wavelength and the bandwidth in the nonlinear frequency conversion process can be continuously tuned and the processes of frequency multiplication, sum frequency, difference frequency, optical parametric amplification and the like of a broadband are realized. By the method, the wider temperature and wavelength bandwidth can be obtained, so that the method can support to obtain the frequency conversion with a larger stable region range and both the bandwidth and the stability are improved.
Description
Technical field
The invention belongs to super crystal lattice material and laser technology field, specifically be a kind of based on superlattice device the second nonlinear bandwidth tuning and widen method, bandwidth comprises wavelength, temperature and the angle that relates in the non-linear frequency transfer process, frequently become device in order to the laser of realizing the broadband, comprise frequency multiplication, photoparametric amplifier etc.
Background technology
1961, people such as Franken observed the generation of nonlinear second harmonic first in experiment, indicated the birth [1] of nonlinear optics.Yet the conversion efficiency of second harmonic that is observed in this experiment is very low, and its main cause is not satisfy momentum conservation.In general medium, momentum conservation can not satisfied automatically, can utilize the birefringence and the dispersion characteristics of crystal, or the manufacturing cycle structure satisfies the momentum conservation condition on crystal.Preceding a kind of matching way is called the birefringence position and is complementary (BPM), a kind of accurate phase matching (QPM) [2] that is called in back.Adopt the BPM matching way to be subjected to many restrictions of material itself, need cut along particular orientation, perhaps need specific working temperature as crystal.And for each concrete material, birefringence also can only be in certain wavelength band redeeming, such as LiNbO
3Can not realize blue light frequency multiplication, LiTaO with BPM
3Birefringence can not be finished effective nonlinear optical process with BPM much smaller than self chromatic dispersion.In order to overcome these shortcomings of BPM, accurate technology that is complementary of development obtained people's extensive concern.Accurate position be complementary notion be 1962 by proposition such as Bloembergen [2]: the periodic modulation by the crystal non-linear susceptibility can compensate in the optical parameter process because the mismatch (perhaps being called the wave vector mismatch) mutually of the position between the first-harmonic that dispersion of refractive index causes and the harmonic wave, with the enhancing of acquisition nonlinear optical effect.The artificial lens that this non-linear susceptibility is subjected to periodic modulation is called as dielectric body superlattice.
The advantage of quasi-phase matching is that the structure of optical superlattice can manually design, and therefore has very big degree of freedom.But in the research work, employed optical superlattice mainly is confined to simple periodic structure [3] in early days.And periodic structure has bigger limitation, can not bring into play the dirigibility of quasi-phase matching fully.Optical superlattice with periodic structure can only be realized coupling to some simple single parametric processes, compares with common BPM method aspect matching capacity and there is no remarkable lifting.In recent years, very big development has appearred in the construction design method of optical superlattice.The optical superlattice structure that some are new is suggested and studies as quasi-periodic structure [4-5], bi-period structure [6-8], aperiodic structure priorities such as [9-11].Compare with periodic structure, these novel superlattice structures have more dirigibility, can realize coupling to more complicated nonlinear optical process.For example, utilize superlattice structure design quasi-periodicity, can realize multiple accurate phase matching, just can realize coupling to several different parametric processes simultaneously.The suitable quasi-periodicity of design in the optical superlattice crystal, can directly realize being coupled frequency tripling process and multi-wavelength frequency multiplication process, this is that traditional BP M method can't realize.
Except traditional one-dimentional structure, optical superlattice also can be two dimension even three-dimensional structure.1998, French scholar Berger at first proposed the notion of two-dimension optical superlattice, and had studied the possibility [12] of utilizing the two-dimension optical superlattice design to realize accurate phase matching.Its main thought is done the two-dimension periodic modulation to the nonlinear second-order optical susceptibility of material, provides two-dimentional reciprocal lattice vector to participate in nonlinear optical process.When first-harmonic wave vector, harmonic wave wave vector and reciprocal lattice vector constitute a closed triangle, get final product Satisfying Matching Conditions.2000, people such as Britain scholar Broderick carried out the checking of experiment aspect to this theory, experiment show this theoretical feasibility [13-14].
The method for designing of one peacekeeping two dimension superlattice all is based on the phase matching principle, and superlattice provide one or more reciprocal lattice vectors at momentum space, to satisfy the momentum conservation of non-linear process.These reciprocal lattice vectors generally all are unimodal or multi-peaks structure in the frequency space, because material dispersion is generally bigger, so the bandwidth of frequency inverted is very little.The bandwidth here comprises wavelength, temperature and the angle etc. that relate in the non-linear frequency transfer process.For example for the frequency multiplication process, when crystal length was several centimetres, the temperature bandwidth generally was not more than 1 ℃, and wavelength bandwidth allows that less than 1nm angle only has the several years.Therefore, the superlattice general work requires input Wavelength of Laser bandwidth narrower in temperature-controlled precision is 0.1 ℃ temperature controlling stove, and centre wavelength and incident angle can not have bigger shake.Amplify in the application at ultra-short pulse photoparametric,, need amplifying device that wide as far as possible bandwidth is arranged, otherwise can influence the efficient of amplifier, increase pulse length in order to obtain short as far as possible laser pulse.In order to stablize the performance of superlattice device in real work, improve the bandwidth of superlattice frequency inverted, need be optimized superlattice structure.
List of references
1、P.A.Franken，A.E.Hill，C.W.Peters，and?G.Weinreich，Phys.Rev.Lett.，7，118(1961)
2、J.A.Armstrong，N.Bloembergen，J.Ducuing，and?P.S.Pershan，Phys.Rev.127，1918(1962)
3、M.M.Fejer，G.A.Magel，D.H.Jundt，and?R.L.Byer，IEEE?J.Quant.Electron.28，2631(1992)
4、S.N.Zhu，Y.Y.Zhu，N.B.Ming，Science，278，843(1997)
5、S.N.Zhu，Y.Y.Zhu，Y.Q.Qin，H.F.Wang，C.Z.Ge，N.B.Ming，Phys.Rev.Lett.，78，2752(1997)
6、K.C.Rustagi，S.C.Mehendale，and?S.Meenakshi，IEEE?J.Quant.Electron.QE-18，1029(1982)
7、M.H.Chou，K.R.Parameswaran，and?M.M.Fejer，Opt.Lett.，24，1157(1999)
8、Z.W.Liu，S.N.Zhu，Y.Y.Zhu，H.T.Wang，G.Z.Luo，H.Liu，N.B.Ming，X.Y.Liang，and?Z.Y.Xu，Chin.Phys.Lett.，18，539(2001)
9、B.Y.Gu，B.Z.Dong，Y.Zhang，and?G.Z.Yang，Appl.Phys.Lett.，75，2175(1999)
10、H.Liu，Y.Y.Zhu，S.N.Zhu，C.Zhang，and?N.B.Ming，Appl.Phys.Lett.，79，728(2001)
11、X.F.Chen，F.Wu，X.L.Zeng，Y.P.Chen，Y.X.Xia，and?Y.L.Chen，Phys.Rev.A?69，013818(2004)
12、V.Berger，Phys.Rev.Lett.81，4136(1998)
13、N.G.R.Broderick，G.W.Ross，H.L.Offerhaus，D.J.Richardson，and?D.C.Hanna，Phys.Rev.Lett.84，4345(2000)
14、N.G.R.Broderick，R.T.Bratfalean，T.M.Monro，and?D.J.Richardson，J.Opt.Soc.Am.B，19，2263(2002)
Summary of the invention
The technical problem to be solved in the present invention is: superlattice bandwidth in the non-linear frequency conversion is very little, and amplify in the application at ultra-short pulse photoparametric, need amplifying device that wide as far as possible bandwidth is arranged, therefore need be optimized superlattice structure, stablize the performance of superlattice device in real work, improve the bandwidth of superlattice frequency inverted.
Technical scheme of the present invention is: a kind of based on superlattice device the second nonlinear bandwidth tuning and widen method, described bandwidth comprises the wavelength that relates in the non-linear frequency transfer process, temperature and angle, adopt fan-shaped or trapezoidal superlattice, according to demand to non-linear process bandwidth and coupling wavelength, determine required center cycle and chirp value, calculate fan-shaped or trapezoidal the superlattice cycle and the incident angle on two limits up and down according to chirp value then, parameter by described superlattice is made fan-shaped or trapezoidal superlattice, utilizes fan-shaped or trapezoidal superlattice and incident angle can realize the centre wavelength and the bandwidth of expecting; On this basis, by adjusting angle and the position between incident beam and the superlattice, obtain the adjustable equivalent chirp superlattice of incident center cycle and chirp value, thereby make the centre wavelength that is complementary of position and bandwidth obtains tuning and expand, be specially: elder generation is according to the dispersion equation and the effect wavelength of super crystal lattice material, according to energy and principle of conservation of momentum design centre cycle, the bandwidth and the tuning range that will reach according to the superlattice device that designs calculated required chirp value again, then according to the fan-shaped or trapezoidal superlattice of the size design of chirp value, make fan-shaped or trapezoidal superlattice up and down the chirp value in two cycles than design slightly greatly so that the adjusting surplus to be provided, after making the superlattice crystal according to design parameter, tunable centre wavelength and lateral attitude and the incident angle decision of chirp value by the relative superlattice of light beam, select suitable incident angle to obtain the chirp value that needs, adjust incoming position and obtain the required center cycle, through the position and or the adjustment of angle, make light beam have required equivalent center cycle and chirp value, thereby realize the non-linear process central temperature, wavelength tuning, and temperature, wavelength bandwidth tuning; During the incident beam angular setting, chirp value is big more, and the reciprocal lattice vector that provides is wide more, and the width of reciprocal lattice vector increases makes temperature, wavelength and the angle of coupling all obtain expanding.
Described second nonlinear process comprises frequency multiplication and frequency, optical parameter amplification, multi-wavelength frequency multiplication and coupling frequency tripling.
The present invention is used for first-harmonic frequency multiplication or and the frequency process that wavelength is 1053nm or 1064nm.
It is 527nm or 532nm wavelength that the present invention is used for pumping light, and signal or ideler frequency light are the difference frequency or the optical parameter amplification process of 1053nm or 1064nm wavelength.
As optimal way, adopt the superlattice base material to be respectively LiTaO
3, LiNbO
3Or KTiOPO
4, the center cycle is respectively 7.5 μ m, 6.5 μ m, and the fan-shaped superlattice of 9.0 μ m are used for the broad band laser frequency multiplication of 1064nm, 1053nm, amplification that the degeneracy of 532nm, 527nm pumping, nearly degeneracy optical parameter are amplified and the optical parameter of femtosecond laser is warbled.
The superlattice device of the inventive method, superlattice base material are LiTaO
3, LiNbO
3Or KTiOPO
4, superlattice base material coupling temperature is 25～200 ℃, superlattice length is 10～30mm, width is 2～5mm, adjust position and the angle determined between superlattice and the light beam,, prepare required optical superlattice sample at last by plate-making, photoetching, polarization process.
The present invention utilizes the optical superlattice of fan-shaped polarization as nonlinear crystal, adopt the mode of incident beam position and angular setting, make the wavelength and the bandwidth of non-linear frequency transfer process obtain continuous tuning, realize the frequency multiplication and the processes such as frequency, difference frequency and optical parameter amplification in broadband.The present invention can obtain wideer temperature and wavelength bandwidth, thereby can support to obtain the frequency inverted of big steady district scope, and bandwidth and stability all are improved.
Description of drawings
Fig. 1 is the nonlinear system numerical symbol of dielectric body superlattice.
Fig. 2 is a linear chrip superlattice structure synoptic diagram, crystal length L, and the cycle is from Λ
1Be increased to Λ
N, the center periods lambda
0
Fig. 3 is the comparison of the lattice pattern Fourier transform of the reciprocal lattice vector of the uniform period superlattice and the superlattice of warbling, and chirp factor r equals 0,0.005,0.01,0.02 respectively.The center periods lambda
0=9.02 μ m, L=2cm.
Fig. 4. be fan-shaped superlattice of the present invention and parameter synoptic diagram thereof.
Fig. 5 is chirp factor r and incident angle
The corresponding relation of (in the crystal).
Fig. 6 is frequency multiplication of the present invention and optical parameter enlarged diagram.
Fig. 7 laterally adjusts the position of light beam in crystal for the present invention, the frequency multiplication coupling temperature and the output power that measure.
Double frequency power temperature curve when Fig. 8 rotates zero degree for the fan-shaped superlattice of the present invention.
Double frequency power temperature curve when Fig. 9 spends for the fan-shaped superlattice rotation 1.42 of the present invention.
Figure 10 produces the frequency spectrum contrast for the optical parameter of even superlattice of the present invention and fan-shaped superlattice.
Embodiment
The present invention is according to the demand to non-linear process bandwidth and coupling wavelength, determine required center cycle and chirp value, calculate the fan-shaped cycle and the incident angle on two limits up and down according to chirp value then, under the situation that above parameter all designs, make fan-shaped superlattice, utilize this fan-shaped crystal and incident angle can realize the centre wavelength and the bandwidth of expecting in the experiment; On this basis, by adjusting angle and the position between incident beam and the superlattice, obtain the adjustable equivalent chirp superlattice of incident center cycle and chirp value, thereby the flexible configuration of convenient experiment, make the centre wavelength that is complementary of position and bandwidth obtains tuning and expand, the coupling here is meant that the position in the non-linear coupling process of three ripples is complementary.Concrete method is: elder generation is according to the dispersion equation and the effect wavelength of super crystal lattice material, and energy and principle of conservation of momentum design centre cycle, just satisfy the superlattice period of phase-matching condition, the bandwidth and the tuning range that will reach according to the superlattice device that designs calculated required chirp value again, then according to the fan-shaped or trapezoidal superlattice of the size design of chirp value, make fan-shaped or trapezoidal superlattice up and down the chirp value in two cycles than design slightly greatly so that the adjusting surplus to be provided, after making the superlattice crystal according to design parameter, tunable centre wavelength and lateral attitude and the incident angle decision of chirp value by the relative superlattice of light beam, select suitable incident angle to obtain the chirp value that needs, adjust incoming position and obtain the required center cycle, through the position and or the adjustment of angle, make light beam have required equivalent center cycle and chirp value, thereby realize the non-linear process central temperature, wavelength tuning, and temperature, wavelength bandwidth tuning; During the incident beam angular setting, chirp value is big more, and the reciprocal lattice vector that provides is wide more, and the width of reciprocal lattice vector increases makes temperature, wavelength and the angle of coupling all obtain expanding.
The present invention is based on the characteristic that the superlattice of warbling can the broadening reciprocal lattice vector, the fan-shaped superlattice of parallel beam or oblique incidence, its effect is equivalent to incident center cycle and the adjustable superlattice of warbling of degree of warbling, thereby makes the centre wavelength of coupling and bandwidth obtain tuning.Specify as follows:
Under situation under the plane-wave approximation situation, the superlattice structure that frequency transformation is required as the superlattice of Fig. 1 characteristic, can be obtained by following formula:
Wherein Λ is a superlattice period; λ
1, λ
2And λ
3Be respectively that interaction three wave-waves are long, ascending arrangement λ
1＜λ
2＜λ
3n
1, n
2And n
3It is corresponding refractive index; T is a temperature.The linear chrip superlattice as shown in Figure 2, establishing crystal length is L, in total N cycle, the cycle is from Λ
1Be increased to Λ
N, the center periods lambda
0, optical direction along the x axle at the x coordinate is-the L/2 place, just the 1st the cycle place, the QPM cycle is Λ
1+ the L/2 place, just N cycle located, and the cycle is Λ
N, Λ
N＞Λ
1Suppose light beam from x=-∞ incident, definition chirp factor r is:
Or be written as:
Here
It is the center cycle.
Chirp factor has been described the relative size that lattice is warbled, and reference value is the mean value in cycle.Chirp factor is big more, and it is big more that lattice is warbled, and vice versa.Lattice has warbles, and with the variation superlattice period difference of lateral attitude, and the superlattice of different cycles can satisfy the position of different wave length and are complementary, thereby realizes the nonlinear frequency transformation of different wave length at the crystals diverse location, and bandwidth is expanded.Fig. 3 is uniformly and has the comparison of Fourier transform frequency spectrum of the reciprocal lattice vector of the lattice of warbling, used crystal is to be 9.02 μ m in the cycle, length is the period polarized KTP (PPKTP) of 2cm, and near the nearly degeneracy parameter of the conllinear of 1064nm that the cycle is suitable for the 532nm pumping amplifies.Horizontal ordinate is a phase mismatch: (Δ K-Δ K
0) * L, L are crystal lengths, Δ K=k
p-k
s-k
i, Δ K
0=2 π/Λ
0, Λ
0It is center cycle (average period).As can be seen from Figure 3, the compensation range of position phase mismatch has been widened in the introducing of warbling greatly, and chirp factor is big more, just can provide wide more reciprocal lattice vector.If crystal is in the constant temperature oven that temperature is T, light beam is with angle
Incident (in the x-y plane), position phase mismatch can be write as following form:
By formula (4) as can be known, the increase of the width of reciprocal lattice vector makes temperature, wavelength and the angle equiband of coupling all be expanded.
In a single day the superlattice of warbling design and produce and finish, and center cycle and degree of warbling are just fixing can not be adjusted.Use for convenience, the present invention introduces fan-shaped superlattice as shown in Figure 4, cooperates the light beam incident of diverse location and angle, has the advantage that can adjust center cycle and degree of warbling.Fan-shaped superlattice width is w, and the cycle on both sides is respectively Λ
aAnd Λ
b, the number (periodicity) on counter-rotating farmland is N.The preceding domain wall in n cycle is a straight line, and available straight-line equation is expressed as:
Light beam (pump light and flashlight) incident angle is
Incidence point (0, ξ), available straight-line equation is expressed as:
Can obtain the intersection point of light and domain wall by above two equations, count, be to the distance of intersection point from incidence point:
Therefore, the cycle of light beam process can be obtained by following formula:
Λ(n)＝X(n+1)-X(n) (8)
Especially, Λ (1)=X (2)-X (1)=X (2) is because X (1) ≡ 0.
The center cycle can be expressed as Λ
0=Λ (N/2)=X (N/2+1)-X (N/2).
Utilize the definition of front chirp factor, can get:
This expression formula is complicated, but by the numerical evaluation to expression formula (9), can obtain some results very clocklike.At first, chirp factor is along with incident angle
Increase and increase, but irrelevant with incoming position ξ, as shown in Figure 5; Secondly, the center cycle increases along with the increase of incoming position and incident angle.This two individual character verify fan-shaped lattice design and the experiment very important.In experiment,, can carry out according to the following steps: only determine owing to warble, at first select suitable incident angle, obtain the chirp value that needs by incident angle in order to obtain the suitable center cycle and to warble; Then, adjust incoming position, obtain the required center cycle.
The crucial part of the inventive method is to use fan-shaped or trapezoidal superlattice, by adjusting the lateral attitude and the anglec of rotation, obtains the superlattice of warbling of equivalence, and can adjust center cycle and chirp value continuously.For example, design fan-shaped lattice as shown in table 1, if select incident angle
And ξ=1.2mm, can calculate according to expression formula (7)～(9), the lattice that light beam passes through will be equivalent to the center periods lambda
0The lattice of=7.59 μ m and the r=0.02 that warbles.
The parameter of the fan-shaped superlattice of table 1
Fig. 4 has then shown according to the chirp factor of the fan-shaped superlattice of table 1 design and the relation of incident angle.As seen, by the beam incident angle degree
Variation, can obtain tunable chirp factor.For utilizing body crystal or the 1053nm of even superlattice or the frequency multiplication of 1064nm laser, can only adjust frequency multiplication centre wavelength by thermal tuning, and after crystal was made, the frequency multiplication wavelength bandwidth was generally only less than 1nm, the temperature bandwidth is no more than 1 ℃, and can not regulate.The fan-shaped superlattice that utilize the present invention to design, can be under temperature-resistant situation, centre wavelength to frequency multiplication and parametric process is carried out tuning, and carry out tuning to frequency multiplication and parametric bandwidth by rotating crystal, realize the second nonlinear process in broadband, be applied to broadband frequency multiplication and optical parameter amplification etc.
The non-linear process that this method is suitable for comprises frequency multiplication and various procedures such as frequency, optical parameter amplification and multi-wavelength frequency multiplication, coupling frequency tripling; The optical superlattice base material that this method is suitable for can comprise LiTaO
3, LiNbO
3Etc. multiple nonlinear optical material; This method also can be used for comprising ultrashort, ultrafast processes such as Terahertz generation, the amplification of optical parameter chirped pulse, femtosecond pulse compression, is a kind of pervasive optical superlattice design method.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Utilize experiment, this superlattice structure method for designing has been carried out experimental verification.
The superlattice base material that uses in the experiment is LiTaO
3, design process is that the first-harmonic frequency multiplication of 1064nm and the nearly degeneracy optical parameter of 532nm pumping produce the about 30mm of superlattice length, the about 5mm of width.Contrast for convenience, we have made all even fan-shaped superlattice template according to the parameter of table 1, by technologies such as plate-making, photoetching, polarization, prepare required period polarized lithium tantalate sample (PPLT).
After the superlattice samples polishing with preparation, carry out frequency multiplication and optical parameter amplification test respectively, the experiment light path as shown in Figure 6.When wherein carrying out the frequency multiplication experiment, make laser instrument only export 1064nm laser, and when carrying out the optical parameter amplification test, make laser instrument export 532nm and 1064nm laser simultaneously, but 1064nm laser is to the utmost point low-level through the attenuator decay.In the frequency multiplication experiment, crystal along the Y-axis translation, is measured temperature match point and corresponding output power as shown in Figure 7.Can see that the coupling temperature is with the linear variation in position, the Total tune temperature surpasses 60 ℃, conforms to result of calculation.When adjusting fan-shaped superlattice angle, obtained the tuning of frequency multiplication temperature bandwidth, shown in Fig. 8 and 9.When crystal angle rotation 1.42 is spent, obtained surpassing 10 ℃ frequency multiplication bandwidth, evenly superlattice have obtained obvious lifting.The green glow that utilizes 532nm is as pump light source, and we have measured all optical parameter generation frequency spectrums of even fan-shaped superlattice, as shown in figure 10.Rotate fan-shaped superlattice, can obtain the optical parameter bandwidth of continuous tuning, when the fan-shaped superlattice anglec of rotation is 5 when spending, the bandwidth that optical parameter produces frequency spectrum surpasses 40nm, and evenly superlattice have obtained obvious lifting.
Claims (6)
1. one kind based on the second nonlinear bandwidth tuning of superlattice device with widen method, described bandwidth comprises the wavelength that relates in the non-linear frequency transfer process, temperature and angle, it is characterized in that adopting fan-shaped or trapezoidal superlattice, according to demand to non-linear process bandwidth and coupling wavelength, determine required center cycle and chirp value, calculate fan-shaped or trapezoidal the superlattice cycle and the incident angle on two limits up and down according to chirp value then, parameter by described superlattice is made fan-shaped or trapezoidal superlattice, utilizes fan-shaped or trapezoidal superlattice and incident angle can realize the centre wavelength and the bandwidth of expecting; On this basis, by adjusting angle and the position between incident beam and the superlattice, obtain the adjustable equivalent chirp superlattice of incident center cycle and chirp value, thereby make the centre wavelength that is complementary of position and bandwidth obtains tuning and expand, be specially: elder generation is according to the dispersion equation and the effect wavelength of super crystal lattice material, according to energy and principle of conservation of momentum design centre cycle, the bandwidth and the tuning range that will reach according to the superlattice device that designs calculated required chirp value again, then according to the fan-shaped or trapezoidal superlattice of the size design of chirp value, make fan-shaped or trapezoidal superlattice up and down the chirp value in two cycles than design slightly greatly so that the adjusting surplus to be provided, after making the superlattice crystal according to design parameter, tunable centre wavelength and lateral attitude and the incident angle decision of chirp value by the relative superlattice of light beam, select suitable incident angle to obtain the chirp value that needs, adjust incoming position and obtain the required center cycle, through the position and or the adjustment of angle, make light beam have required equivalent center cycle and chirp value, thereby realize the non-linear process central temperature, wavelength tuning, and temperature, wavelength bandwidth tuning; During the incident beam angular setting, chirp value is big more, and the reciprocal lattice vector that provides is wide more, and the width of reciprocal lattice vector increases makes temperature, wavelength and the angle of coupling all obtain expanding.
2. according to claim 1 based on superlattice device the second nonlinear bandwidth tuning and widen method, it is characterized in that described second nonlinear process comprise frequency multiplication and frequently, optical parameter amplifies, multi-wavelength frequency multiplication and coupling frequency tripling.
3. according to claim 1 based on superlattice device the second nonlinear bandwidth tuning and widen method, it is characterized in that being used for first-harmonic frequency multiplication that wavelength is 1053nm or 1064nm or and process frequently.
4. according to claim 1 based on superlattice device the second nonlinear bandwidth tuning and widen method, it is characterized in that being used for pumping light is 527nm or 532nm wavelength, signal or ideler frequency light are the difference frequency or the optical parameter amplification process of 1053nm or 1064nm wavelength.
5. according to claim 1 based on superlattice device the second nonlinear bandwidth tuning and widen method, it is characterized in that adopting the superlattice base material to be respectively LiTaO
3, LiNbO
3Or KTiOPO
4, the center cycle is respectively 7.5 μ m, 6.5 μ m, and the fan-shaped superlattice of 9.0 μ m are used for the broad band laser frequency multiplication of 1064nm, 1053nm, amplification that the degeneracy of 532nm, 527nm pumping, nearly degeneracy optical parameter are amplified and the optical parameter of femtosecond laser is warbled.
According to claim 1-4 each described based on superlattice device the second nonlinear bandwidth tuning and widen method, it is characterized in that described superlattice base material is LiTaO
3, LiNbO
3Or KTiOPO
4, superlattice base material coupling temperature is 25～200 ℃, and superlattice length is 10～30mm, and width is 2～5mm, by plate-making, photoetching, polarization process, prepares required optical superlattice sample.
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| CN114185223B (en) * | 2020-09-15 | 2024-03-26 | 山东大学 | Parametric light generation method and application |
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