CN101938086A - Method for constructing cascade superlattice mode-locked laser - Google Patents
Method for constructing cascade superlattice mode-locked laser Download PDFInfo
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- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 7
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- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
The invention discloses a method for constructing a cascade superlattice mode-locked laser. In the method, cascade optical superlattices are used as nonlinear crystals, the cascade second-order nonlinear effect of two or more sections of domain-structure cascade optical superlattices is utilized to generate equivalent third-order nonlinear effect, and the nonlinear crystals are enabled to work at phase matching points by controlling the temperature of the optical superlattices through controlling the temperature of a furnace; a resonant cavity is adjusted to reach the requirement of nonlinear frequency conversion; and the position of a diaphragm in the resonant cavity of a laser is set to ensure that the radius of facula at the position of the diaphragm is reduced along with the increment of pumping power, the diaphragm realizes nonlinear loss modulation and spatial phase modulation is converted into intensity modulation, thus realizing mode locking laser output. The method can obtain a bigger non-linear loss coefficient, thereby being capable of supporting mode locking operation with larger stable area range, realizing self-starting of the mode-locked laser and improving the facula quality, stability and the optical to optical conversion efficiency.
Description
Technical field
The invention belongs to the laser technique field, relate to mode-locked laser, be specially a kind of building method of cascade connection superlattice mode-locked laser.
Background technology
All solid state picosecond laser all is widely used in fields such as nonlinear frequency transformation, industrial processes, spectroscopy, medical diagnosiss, and can provide outstanding psec seed source [1] for regenerative amplifier.For example,, littler thermal ablation is arranged, can be used for retrofit with respect to nanosecond laser at little manufacture field; In the nonlinear frequency transformation field, all solid state accent Q nanosecond laser with respect to semiconductor pumped under identical average power, can provide bigger peak power, obtains high non-linear conversion efficient.For example, utilize the solid state laser of nonlinear crystal locked mode,, be easier to obtain red-green-blue output, as light source [2] of laser display or the like by frequency multiplication in the chamber or outside the chamber and technology frequently.The method that realizes the psec mode-locked laser has kerr lens mode locking, extra-pulse locked mode, semiconductor saturable absorber locked mode and cascade second nonlinear locked mode etc.Kerr lens mode locking is to utilize the interaction of diaphragm in self focusing that the non-linear three rank Kerr effects of laser medium cause and the chamber to realize locked mode, because the non-linear loss that the kerr lens effect is introduced is too little, generally can not be applied in the solid state laser of low peak power running, and can not self-starting; The extra-pulse mode-locked laser can obtain than short pulse, but must rely on feedback circuit to the long precisely control in chamber, complex structure; The saturated absorbing body locked mode is since invention in 1992, because simple in structure, stable performance is widely used, but the semiconductor technology of the growth needs complexity of saturated absorbing body material, and anti-damage threshold is low, and absorber bandwidth and operation wavelength also are subjected to the restriction of semi-conducting material and structure; Cascade second nonlinear locked mode uses nonlinear crystal, and suitable wave-length coverage is wide, and time response is fast, can obtain than short pulse, does not need the long control in accurate chamber, and anti-damage threshold height.Self-cascading second nonlinear locked mode proposes, and state of development is as follows:
Nineteen ninety-five, G.Cerullo, people such as V.Magni [3] have delivered " Self-starting modelocking of a cw Nd:YAG laser using cascaded second-order nonlinearities " on Optics Letters, the author adopts the long Nd:YAG rod of ti sapphire laser pumping 10mm first, use the long non-critical phase matched LBO of 15mm to make frequency-doubling crystal, obtain the mode locking pulse output of average power 0.5W, pulsewidth 14 psecs, repetition rate 71.5MHz.
1998, people such as V.Magni delivered " Nd:YVO on Optics commutications
4Laser modelocked by cascading of second order nonlinearities ", the author adopts II class coupling ktp crystal [4] first, cooperates ti sapphire laser pumping Nd:YVO
4System obtains the output of pulsewidth 6.8 psec mode locking pulses.
2005, S.J.Holmgren, people such as V.Pasiskevicius are delivering " Generationof 2.8 ps pulses by mode-locking a Nd:GdVO on Optics Express
4Laser with defocusing cascaded Kerr lensingin periodically poled KTP ", the author adopts 808nm diode-end-pumped Nd:GdVO
4The PPKTP long with 2.3mm makes frequency-doubling crystal, obtains the continuous locking mold pulse output of average power 350mW, live width 0.6nm, repetition rate 200MHz, pulsewidth 2.8 psecs [5].
2010, people such as Hristo Iliev delivered " Passive mode-locking of adiode-pumped Nd:YVO on Optics Express
4Laser by intracavity SHG in PPKTP ", delivered " High-power picosecond Nd:GdVO on the Optics Letters
4Laser mode locked by SHG in periodically poledstoichiometric lithium tantalite " two pieces of articles adopt PPKTP respectively; and PPMgSLT is nonlinear crystal [6; 7], obtains the mode locking pulse output of peak power 5W, and the light light conversion efficiency is 21.5%.
The development of cascade second nonlinear locked mode so far, no matter use be complementary material or accurate position, birefringence position to be complementary material as nonlinear crystal, all be to make nonlinear crystal be operated in the phase mismatch point, produce nonlinear phase shift by cascaded second-order nonlinear interaction, by changing the positive and negative symbol that changes nonlinear phase shift of wave vector mismatch Δ k, nonlinear phase shift is for over against answering self-focusing effect, and nonlinear phase shift is negative corresponding self-defocusing effect.Nonlinear phase shift when negative, diaphragm (soft or hard diaphragm) in the mating cavity, the spot radius that makes the diaphragm place reduces with the increase of intracavity power, is similar to kerr lens, realizes the locked mode running.Because nonlinear crystal is operated in the phase mismatch state, the nonlinear phase shift of introducing is less than normal, the modulation depth deficiency, make mode-locked laser output in the normal state can not self-starting with keep, therefore laser all is operated in the steady area edge that power output reduces with the increase of pumping merit, the zone of steady operation diminishes, and has directly influenced optical quality, power output and stability.When mentioning the locked mode generation as people such as S.J.Holmgren, hot spot can be seen the obvious diffraction ring in the far field, and power output sharply descends, and the light light conversion efficiency is on the low side, is difficult to obtain locked mode output [5] high-power, high light beam quality.
1.D.Burns，G.J.Valentine，W.Lubeigt，E.Bente，and?A.I.Ferguson，[J].Proceedings?of?SPIE4629，129(2002).
2.Brunner?Felix，Innerhofer?Edith；，Marchese?Sergio?V，Südmeyer?Thomas，PaschottaRüdiger，Usami?Takeshi，Ito?Hiromasa，Kurimura?Sunao，Kitamura?Kenji，ArisholmGunnar，and?Keller?Ursula，Optics?Letters?29，1921(2004).
3.G.Cerullo，S.De?Silvestri，A.Monguzzi，D.Segala，and?V.Magni，Optics?Letters?20，746(1995).
4.V.Magni，and?M.Zavelani-Rossi，Optics?Communications?152，45(1998).
5.S.J.Holmgren，V.Pasiskevicius，and?F.Laurell，Opt.Express?13，5270(2005).
6.Hristo?Iliev，Danail?Chuchmishev，Ivan?Buchvarov，and?Valentin?Petrov，Opt.Express18，5754(2010).
7.Hristo?Iliev，Ivan?Buchvarov，Sunao?Kurimura，and?Valentin?Petrov，Optics?Letters?35，1016(2010).
Summary of the invention
The problem to be solved in the present invention is: be operated in cascade second nonlinear mode-locked laser under the phase mismatch state to the requirement height in chamber, output facula is of poor quality, and the light light conversion efficiency is lower, and the steady district of locked mode is less.The objective of the invention is to propose a kind of based under complete phase-matching condition, the optical superlattice that utilizes cascade structure improves the output beam quality of mode-locked laser and the scheme of stability as nonlinear crystal.
Technical scheme of the present invention is: the building method of cascade connection superlattice mode-locked laser, mode-locked laser comprises pump light source, resonant cavity, the optical superlattice of temperature control furnace and cascade, the optical superlattice of cascade is as nonlinear crystal, utilize the cascaded second-order nonlinear interaction in two sections or the multistage domain structure cascade optical superlattice, produce the third-order non-linear effect of equivalence, realize non-linear process, space phase to fundamental wave is modulated, the cycle unanimity that the optical superlattice of its cascade is every section, interval between each section is identical, temperature by temperature control furnace control optical superlattice makes nonlinear crystal be operated in the phase matched point; Adjust resonant cavity, make the spot radius of the spot radius of laser crystal place basic mode greater than pumping, the spot radius at nonlinear crystal place is 50-100um, and making light intensity is MW/cm
2Magnitude, reach the requirement of non-linear frequency conversion; Stop position in the laser resonant cavity is set, and the spot radius that makes the diaphragm place reduces with the increase of pump power, and diaphragm is realized non-linear loss modulation, and the space phase modulation is converted into intensity modulated, realizes mode-locked laser output.
The non-linear process of the optical superlattice structure of two sections cascades is expanded to by the frequency multiplication process and frequency, difference frequency and parametric process.By the control of two spacer segments being realized the control to relative phase between three ripples, thereby the direction that control energy flows realizes the modulation to the first-harmonic nonlinear phase shift, realizes the locked mode output of first-harmonic and residue parameteric light, and the wavelength of mode-locked laser is expanded.
Resonant cavity adopts four mirror refrative cavity structures, is made up of two flat mirrors, two concave mirrors, and output and input cavity mirror are flat mirror, and two refrative mirrors are concave mirror; The control precision of temperature control furnace is 0.1 ℃.
The optical superlattice of cascade places temperature control furnace, and by the temperature control furnace temperature control, the optical superlattice of cascade and temperature control furnace all are positioned at resonant cavity, and optical superlattice comprises paracycle, aperiodic, binary cycle and cycle, and host material comprises congruent LiTaO
3, congruent LiNbO
3, stoichiometric proportion LiTaO
3, stoichiometric proportion LiNbO
3, mix the lithium niobate of MgO, the lithium tantalate of mixing MgO, potassium titanyl oxygenic phosphate(KTP) crystal KTP and phosphoric acid titanyl rubidium crystal RTP, select different substrates material and superlattice structure for use according to the requirement of frequency translation, realize the locked mode running of required wave band.
Laser crystal comprises Nd:YAG, the Nd:YVO of optical pumping
4, Nd:GdVO
4, titanium-doped sapphire, Yb:YAG, Nd:LMA, Nd:YLF, Nd:YAP, Er:YAG, Er:YLF, Er:YALO
3, mix the crystal of Tm, Ho, or adopt the gain media of other energisation mode, comprise light stimulus and electric excitation.
The present invention utilizes the cascaded second-order nonlinear interaction in two sections or the multistage domain structure cascade optical superlattice, the second order nonlinear cascade process is to utilize for twice second nonlinear to interact in succession, light-wave energy is exchanged between first-harmonic and harmonic wave, thus the process that causes phase characteristics to change.In whole process, part fundamental frequency light at first is converted to frequency doubled light by positive process, adjust the relative phase of first-harmonic and frequency multiplication ripple by the interval of two sections or multistage, make the frequency doubled light that produced again through the inverse process fundamental frequency light that flows backwards back, specifically physical process can be expressed as: χ
(2)(ω; 2 ω ,-ω): χ
(2)(2 ω; ω, ω), χ wherein
(2)The expression second-order nonlinear polarizability, ω is the fundamental wave frequency, and 2 ω are the frequency doubled light frequency, and fundamental frequency light will be sensed nonlinear phase shift this moment, be equivalent to the χ of a frequency degeneracy
(3)(ω; ω, ω ,-ω), the third-order non-linear process produces the third-order non-linear effect of equivalence, χ
(3)The expression third-order nonlinear susceptibility.Space phase to fundamental wave is modulated, by suitable cavity design, the spot radius that makes laser crystal place basic mode greater than with the spot radius of pumping, the hot spot at nonlinear crystal place is as far as possible little, radius is about 50-100um, making light intensity is MW/cm
2Magnitude, to reach the requirement of non-linear frequency conversion.As shown in Figure 4, when crystal is operated in the temperature match point, nonlinear phase shift is a negative value, corresponding to the self-defocusing effect, the diaphragm that cooperates correct position, the spot radius that makes the diaphragm place reduces with the increase of pump power, and diaphragm just can realize that non-linear loss modulates, the phase modulated in space is converted into intensity modulated so, realizes mode-locked laser output.
The design of above-mentioned resonant cavity, diaphragm and adjustment, under described condition, those skilled in the art all can adjust realization voluntarily according to the known technology of this area, no longer describe in detail.
The present invention can select different substrates material and superlattice structure for use according to the requirement of frequency translation, realizes the locked mode running of required wave band.To realize that the 1064nm locked mode is an example, select the lithium niobate of mixing MgO for use, coupling temperature 41.6 degree, if use the optical superlattice of two sections periodic structure cascades, the first segment structure cycle was 6.777um, be used to realize that the 1064nm frequency multiplication is to 532nm, the cycle of second segment structure is 6.777um, realization 532nm returns and is converted into 1064nm, the interval a of two sections cascade structures can be 1/4,1/6,1/3 or the like of the cycle, size has at interval determined the relative phase of two nonlinear cascade process, and directly influence produces the size of nonlinear phase shift.
Optical superlattice also can be structure such as fan-shaped or warble, adjust the position of incident ray, fan-shaped superlattice are the size of adjustment cycle continuously, makes the temperature match point of frequency multiplication obtain tuning, be used to expand the temperature bandwidth of frequency multiplication, promote the stability of laser operation.The crystal of selecting for use the lithium niobate of mixing MgO, the lithium tantalate of mixing MgO etc. at room temperature to work, even can not use temperature control furnace, only regulate the position of incident light, obtain the output of mode locking pulse sequence.
Cascade second nonlinear locked mode than traditional phase mismatch (wave vector mismatch Δ k ≠ 0), the present invention utilizes the optical superlattice of cascade structure, by temperature control furnace control temperature, make the frequency multiplication and all complete phase matched (wave vector mismatch Δ k=0) of revolutionization process of each section of superlattice of two sections or multistage cascade, can introduce bigger nonlinear phase shift.At plane-wave approximation with to become amplitude slowly approximate down, three ripple coupledwave equation by the frequency multiplication process, Theoretical Calculation result such as Fig. 4 show, in calculating, the optical superlattice of cascade structure is operated in the phase matched point, traditional structure according to bibliographical information, selection is operated in phase place excuse me, but I must be leaving now a little, and the nonlinear phase shift that the inventive method is introduced can be than the high magnitude of conventional method, the corresponding also high magnitude of nonlinear refraction rate coefficient, under the equal conditions, can obtain bigger non-linear loss factor, thereby can support to obtain the locked mode running of big steady district scope, realize the self-starting of mode-locked laser, optical quality, stability all is improved with the light light conversion efficiency.
Description of drawings
Fig. 1 is the mode-locked laser structural representation of the inventive method structure.
Fig. 2 is the cascade connection superlattice schematic diagram of two sections cascade structures of the present invention.
Fig. 3 is the cascade connection superlattice schematic diagram of multistage cascade structure of the present invention.
Fig. 4 is cascade structure of the present invention (during wave vector mismatch Δ k=0) and traditional structure (wave vector mismatch Δ k ≠ 0 o'clock) nonlinear phase shift comparison diagram.
Embodiment
As Fig. 1, be the mode-locked laser structural representation of the inventive method structure, be example with realization 1064nm locked mode, among the figure: comprise resonant cavity front cavity mirror 1, high anti-to resonance wavelength 1064nm, high saturating to 808nm, be the input mirror of laser; Resonant cavity Effect of Back-Cavity Mirror 7 to the transmission of resonance wavelength 1064nm part, is the outgoing mirror of laser; Laser crystal 2, the laser medium of generation 1064nm wavelength; The first chamber mirror 3, high anti-to resonance wavelength 1064nm laser; The second chamber mirror 4, high anti-to resonance wavelength 1064nm laser; Resonant cavity adopts four mirror refrative cavity structures, is made up of two flat mirrors, two concave mirrors, and resonant cavity front cavity mirror 1 resonant cavity Effect of Back-Cavity Mirror 7 is flat mirror, and the first chamber mirror 3 and the second chamber mirror 4 are concave mirror; The optical superlattice 5 of cascade structure, the optical superlattice 5 of cascade is as nonlinear crystal, utilize the cascaded second-order nonlinear interaction in two sections or the multistage domain structure cascade optical superlattice, produce the third-order non-linear effect of equivalence, realize non-linear process, space phase to fundamental wave is modulated, the cycle unanimity that the optical superlattice of its cascade is every section, interval between each section is identical, temperature by temperature control furnace 6 control optical superlattices, make nonlinear crystal be operated in the phase matched point, the optical superlattice 5 and the temperature control furnace 6 of cascade all are positioned at resonant cavity, and the control precision of temperature control furnace 6 is 0.1 ℃. Adjust resonant cavity, i.e. the position of resonant cavity front cavity mirror 1 resonant cavity Effect of Back-Cavity Mirror 7 makes the spot radius of laser crystal 2 place's basic modes be slightly larger than the spot radius of pumping, and the hot spot at nonlinear crystal place is as far as possible little, to reach the requirement of non-linear frequency conversion; The position of the diaphragm 8 in the laser resonant cavity is set, and the spot radius that makes the diaphragm place reduces with the increase of pump power, and diaphragm is realized non-linear loss modulation, and the space phase modulation is converted into intensity modulated, realizes mode-locked laser output.
The present invention relates to laser, the laser crystal of use can be to use Nd:YAG, the Nd:YVO of optical pumping
4, Nd:GdVO
4, titanium-doped sapphire, Yb:YAG, Nd:LMA, Nd:YLF, Nd:YAP, Er:YAG, Er:YLF, Er:YALO
3, mix the crystal of Tm, Ho etc., or adopt the gain media of other energisation mode, comprise it being light stimulus and electric excitation etc.
The present invention uses the host material of optical super lattice material, comprises congruent LiTaO
3(CLT), congruent LiNbO
3(CLN), stoichiometric proportion LiTaO
3(SLT), stoichiometric proportion LiNbO
3(SLN), mix the lithium niobate of MgO, the lithium tantalate of mixing MgO, nonlinear optical crystals such as KTP, RTP.Wherein, SLT, the relative CLT of SLN crystal, CLN crystal have higher optic damage threshold value; Mix the lithium niobate of MgO, the lithium tantalate of mixing MgO can be worked at room temperature, and the unglazed effect of selling off.Emission wavelength according to the dispersion of refractive index of different crystal material relation and different laser crystal can calculate the structural parameters of particular optical superlattice, thereby realizes the output of efficient stable laser.
The optical superlattice of two sections cascades that the present invention relates to, first section domain structure is used for the wavelength frequency multiplication with resonant laser light, and second section domain structure returns frequency doubled light to the wavelength that is transformed into resonant laser light with crossing, and the relative phase of two nonlinear cascade process is by the interval determination between the two-stage structure.Each section domain structure can be used different sequences, comprises cycle, paracycle, binary cycle, aperiodic, fan-shaped or warble etc.The single hop farmland is sector structure or chirp structure, is used to expand the temperature bandwidth of frequency multiplication process, realizes stable locked mode output.
The non-linear process that the optical superlattice structure of two ends cascade realizes also can be generalized to frequently from the frequency multiplication process, parametric process.By the control of two spacer segments being realized the control to relative phase between three ripples, thereby the direction that control energy flows realizes the modulation to the first-harmonic nonlinear phase shift, realizes the locked mode output of first-harmonic and residue parameteric light, and the wavelength of mode-locked laser is expanded.
The optical superlattice structure of two sections cascades also extends to the structure of multistage cascade, as Fig. 3, the multistage cascade structure is the expansion of two-stage structure, every segment structure can only comprise tens or tens cycles, and in the two-stage structure, every segment structure comprises hundreds of even thousands of cycles, and the interval between each section is identical, is 1/4,1/6,1/3 cycle or the like.Every section hockets frequency multiplication and revolutionization process, and the interval determination between each segment structure of the relative phase between a plurality of nonlinear cascade process is used for the optimization to nonlinear phase shift.
The present invention can realize with reference to mode described below:
Cascade second nonlinear continuous locking mold all solid state laser provided by the invention, the optical element and the material of use have: be used for the diode laser of side or end pumping, to the resonant cavity front cavity mirror 1 that 1064nm is all-trans, the laser gain crystal 2 is Nd:YVO
4To the high anti-chamber mirror 3,4 of resonance wavelength 1064nm, select different parameters, make laser reach the requirement of non-linear conversion at the spot size at laser crystal 2 place's spot sizes and chamber film coupling, nonlinear cascade crystal 5 place, be used to control the temperature control furnace 6 of nonlinear crystal temperature, the Effect of Back-Cavity Mirror 7 of resonant cavity has certain transmitance as outgoing mirror to 1064nm.1064nm laser resonance between 1,7 of laser crystal emission, during laser process nonlinear crystal 5, in the last period structure, produce the frequency doubled light of 532nm, phase modulated through super-interval a, by back one segment structure the time, frequency doubled light 532nm returns and is transformed into 1064nm, make the 1064nm laser of resonance produce nonlinear phase shift, hard diaphragm 8 or soft light door screen in the mating cavity, the gain diaphragm that pump beam forms at laser crystal 2 places, make the nonlinear phase modulation be converted into the nonlinear amplitude modulation, realize the locked mode running of 1064nm.
Embodiment 1:
Make the cascade second nonlinear mode-locked laser that a 1064nm cascade connection superlattice is realized according to Fig. 1.The diode laser that is used for end pumping, output wavelength 808nm, to the resonant cavity front cavity mirror 1 that 1064nm is all-trans, the 808nm height is saturating, the laser gain crystal 2 is Nd:YVO
4To resonance wavelength the 1064nm high anti-first chamber mirror 3, the second chamber mirror 4, select suitable chamber type, make the spot size of laser reach the requirement of non-linear conversion at optical superlattice 5 places of laser crystal 2 place's spot sizes and chamber film coupling, cascade, be used to control the temperature control furnace 6 of nonlinear crystal temperature, the Effect of Back-Cavity Mirror 7 of resonant cavity has certain transmitance as outgoing mirror to 1064nm.1064nm laser resonance between 1,7 of laser crystal emission by the effect of nonlinear crystal, is realized the locked mode running of 1064nm, by Effect of Back-Cavity Mirror 7 outputs of resonant cavity.The repetition rate of the long decision in chamber mode locking pulse sequence can select the chamber long according to concrete needs.
Embodiment 2:
Make the cascade second nonlinear mode-locked laser that a 1064nm cascade connection superlattice is realized according to Fig. 1.The diode laser that is used for profile pump, output wavelength 808nm, the resonant cavity front cavity mirror 1 that 1064nm is all-trans, laser benefit crystal position 2 is Nd:YAG, to the high anti-chamber mirror 3,4 of resonance wavelength 1064nm, select different parameters, make laser reach the requirement of non-linear conversion at the spot size at laser crystal 2 place's spot sizes and chamber film coupling, nonlinear cascade crystal 5 place, be used to control the temperature control furnace 6 of nonlinear crystal temperature, the Effect of Back-Cavity Mirror 7 of resonant cavity has certain transmitance as outgoing mirror to 1064nm.1064nm laser resonance between 1,7 of laser crystal emission by the effect of nonlinear crystal, is realized the locked mode running of 1064nm, and Effect of Back-Cavity Mirror 7 outputs of resonant cavity are arranged.
Embodiment 3:
Make the cascade second nonlinear mode-locked laser that a 1064nm cascade connection superlattice is realized according to Fig. 1.Different with example 1 is, an end face of laser crystal 2 is as input mirror, this end face be 808nm high saturating, 1064nm is high anti-.Obtain the locked mode output of 1064nm.
Embodiment 4:
Make the cascade second nonlinear mode-locked laser that a 1342nm cascade connection superlattice is realized according to Fig. 1.Different with example 1 is, the wavelength of resonance is 1342nm, and the chamber mirror of resonant cavity and the cycle of nonlinear crystal and two ends obtain the locked mode output of 1342nm at interval according to the 1342nm design.
Embodiment 5:
Make the cascade second nonlinear mode-locked laser that a cascade connection superlattice is realized according to Fig. 1.Different with example 1,2 is that the laser crystal 2 of use can be Nd:GdVO
4, titanium-doped sapphire, Yb:YAG, Nd:LMA, Nd:YLF, Nd:YAP, Er:YAG, Er:YLF, Er:YALO
3, mix the crystal of Tm, Ho etc., the pump mode of employing can be end pumping or profile pump, the output wavelength of the diode of use is decided by the absorption line of crystal, the wavelength of locked mode output is the emission wavelength of gain crystal.
Embodiment 6:
Make the cascade second nonlinear mode-locked laser that a multistage cascade connection superlattice is realized according to Fig. 1.Different with example 1,2,3,4,5 is, the nonlinear crystal 5 of use is not the superlattice of two sections cascades, but the structure of multistage cascade can be selected different resonance wavelength according to laser crystal, the cycle of design superlattice and the interval of each section.Obtain locked mode output.
Claims (8)
1. the building method of cascade connection superlattice mode-locked laser, it is characterized in that mode-locked laser comprises pump light source, resonant cavity, the optical superlattice of temperature control furnace and cascade, the optical superlattice of cascade is as nonlinear crystal, utilize the cascaded second-order nonlinear interaction in two sections or the multistage domain structure cascade optical superlattice, produce the third-order non-linear effect of equivalence, realize non-linear process, space phase to fundamental wave is modulated, the cycle unanimity that the optical superlattice of its cascade is every section, interval between each section is identical, temperature by temperature control furnace control optical superlattice makes nonlinear crystal be operated in the phase matched point; Adjust resonant cavity, make the spot radius of the spot radius of laser crystal place basic mode greater than pumping, the spot radius at nonlinear crystal place is 50-100um, and making light intensity is MW/cm
2Magnitude, reach the requirement of non-linear frequency conversion; Stop position in the laser resonant cavity is set, and the spot radius that makes the diaphragm place reduces with the increase of pump power, and diaphragm is realized non-linear loss modulation, and the space phase modulation is converted into intensity modulated, realizes mode-locked laser output.
2. the building method of cascade connection superlattice mode-locked laser according to claim 1 is characterized in that the single hop farmland is sector structure or chirp structure in the optical superlattice structure of cascade, is used to expand the temperature bandwidth of frequency multiplication process, realizes stable locked mode output.
3. the building method of cascade connection superlattice mode-locked laser according to claim 1 and 2 is characterized in that the non-linear process of the optical superlattice structure of two sections cascades is expanded to by the frequency multiplication process and frequency, difference frequency and parametric process.
4. the building method of cascade connection superlattice mode-locked laser according to claim 1 and 2 is characterized in that resonant cavity adopts four mirror refrative cavity structures, is made up of two flat mirrors, two concave mirrors, and output and input cavity mirror are flat mirror, and two refrative mirrors are concave mirror; The control precision of temperature control furnace is 0.1 ℃.
5. the building method of cascade connection superlattice mode-locked laser according to claim 3 is characterized in that resonant cavity adopts four mirror refrative cavity structures, is made up of two flat mirrors, two concave mirrors, and output and input cavity mirror are flat mirror, and two refrative mirrors are concave mirror; The control precision of temperature control furnace is 0.1 ℃.
6. the building method of cascade connection superlattice mode-locked laser according to claim 1 and 2, the optical superlattice that it is characterized in that cascade places temperature control furnace, by the temperature control furnace temperature control, the optical superlattice of cascade and temperature control furnace all are positioned at resonant cavity, optical superlattice comprises paracycle, aperiodic, binary cycle and cycle, and host material comprises congruent LiTaO
3, congruent LiNbO
3, stoichiometric proportion LiTaO
3, stoichiometric proportion LiNbO
3, mix the lithium niobate of MgO, the lithium tantalate of mixing MgO, potassium titanyl oxygenic phosphate(KTP) crystal KTP and phosphoric acid titanyl rubidium crystal RTP, select different substrates material and superlattice structure for use according to the requirement of frequency translation, realize the locked mode running of required wave band.
7. the building method of cascade connection superlattice mode-locked laser according to claim 1 and 2 is characterized in that laser crystal comprises Nd:YAG, the Nd:YVO of optical pumping
4, Nd:GdVO
4, titanium-doped sapphire, Yb:YAG, Nd:LMA, Nd:YLF, Nd:YAP, Er:YAG, Er:YLF, Er:YALO
3, mix the crystal of Tm, Ho, or adopt the gain media of other energisation mode, comprise light stimulus and electric excitation.
8. the building method of cascade connection superlattice mode-locked laser according to claim 1, when it is characterized in that realizing the output of 1064nm mode-locked laser, select the lithium niobate of mixing MgO for use, coupling temperature 41.6 degree, use the optical superlattice of two sections periodic structure cascades, the first segment structure cycle was 6.777um, be used to realize that the 1064nm frequency multiplication is to 532nm, the cycle of second segment structure is 6.777um, realization 532nm returns and is converted into 1064nm, the size of the interval a of two sections cascade structures determines the relative phase of two nonlinear cascade process, and directly influence produces the size of nonlinear phase shift.
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| CN106842379A (en) * | 2017-04-14 | 2017-06-13 | 山东师范大学 | A kind of method for designing of two-dimentional quasi-periodic optical superlattice structure |
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| CN110058512A (en) * | 2019-04-12 | 2019-07-26 | 中国科学院国家授时中心 | A kind of achievable power enhancing, phase-adjustable and locking lattice field device |
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| CN113288418B (en) * | 2021-05-22 | 2022-11-04 | 中国科学院理化技术研究所 | Laser scalpel with tunable wavelength |
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