CN105470794A - Active resonant cavity based self-similarity ultrashort pulse amplification system and working method therefor - Google Patents
Active resonant cavity based self-similarity ultrashort pulse amplification system and working method therefor Download PDFInfo
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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Abstract
The invention discloses an active resonant cavity based self-similarity ultrashort pulse amplification system and a working method therefor. The self-similarity ultrashort pulse amplification system is characterized by comprising an optical frequency comb-shaped generator, a pre-chirping management apparatus, an active optical resonant cavity and a dispersion compensation apparatus that are connected in sequence, wherein the active optical resonant cavity is also connected with an electronic control circuit and a pump laser. The active resonant cavity based self-similarity ultrashort pulse amplification system has the advantages that an outer cavity enhancement technique is adopted, so that the self-similarity amplification for the ultrashort pulse is realized by using solid gain mediums, and the gain narrowing is overcome; the nonlinear widening of spectrum in the amplification process is realized, the pulse contract ratio is improved, and the problems of unstable modes, self-focusing and the like existing in the high-power amplification process of an optical fiber amplifier are effectively restrained; and the self-similarity ultrashort pulse amplification system is used as a reliable scientific research tool for researching high-field laser physics and non-linear optics.
Description
Technical field
The invention belongs to technical field of ultrafast laser, be specifically related to a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof.
Background technology
Along with the fast development of laser technology, have high peak power, the ultra-short pulse source of extremely narrow pulse duration has directly brought research and industrial production into microcosmic ultrafast process field.In recent years, be reduced to the even several femtosecond of tens femtoseconds along with laser pulse width, ultrashort pulse plays more and more important role in fields such as optical fiber communication, nonlinear optics, optical sensing, micro-nano technology, medical treatment, laser measurements.
Current high-peak power ultra-short pulse laser amplification system mainly adopts chirped pulse amplification (CPAchirped-pulseamplification) to improve pulse peak power.Its general principle is, before seed pulse enters amplifier, use positive dispersion element by its pulse duration broadening to hundreds of psec even several nanosecond, thus its peak power is reduced several order of magnitude, then chirped pulse is exaggerated in fiber amplifier, compresses it finally by negative dispersion element.The accumulation of nonlinear effect in amplification process can be avoided like this, improve pulse quality and amplification efficiency.But for existing gain medium, although there is very wide atom gain live width, but only near atom centre frequency, just there is maximum stimulated radiation cross section, so in pulse amplifier, the spectrum component at pulse two edges place can not effectively be amplified, and centre frequency composition is sufficiently amplified, which results in the pulse spectrum after amplification and narrow, be i.e. so-called Gain-narrowing effect.Gain-narrowing effect directly limit the spectrum width of high power pulse, and the most narrow pulse width that Optical Maser System exports is inversely proportional to the width of frequency spectrum.Therefore reduce Gain-narrowing effect to the impact of high power ultra-short pulse laser device, become the important topic of High Power Femtosecond Laser research field.
Self similarity amplifying technique (the SSA that 20 end of the centurys proposed, self-similarityamplification), utilize longer high-gain positive dispersion fiber as gain media, make femtosecond pulse in amplification process, experience self-similar transmission process, frequency spectrum and pulse duration broadening simultaneously, effectively inhibit Gain-narrowing effect, there is high-gain, high efficiency, the simple advantage of structure, cause the extensive concern of scientific research institution in recent years.Because self similarity amplifying technique belongs to the nonlinear transmission characteristic that make use of pulse, comparing with chirped pulse amplification is the Linear magnifying technology in high of representative, can effectively suppress amplified spontaneous emission (ASE) to improve contrast ration.But existing self similarity amplifier all needs pulse through sufficiently long gain fibre, in positive dispersion, nonlinear effect, forms self similarity and develops under the acting in conjunction of gain.And existing gain fibre is as single mode gain fibre, doubly clad optical fiber, large mode area pcf etc., the impact that can be limited to again self focusing and the unstable effect of pattern when high power causes output facula quality deterioration.This defect seriously limits the ultrashort pulse using self similarity amplifying technique to obtain high-peak power.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof are provided, this self similarity ultrashort pulse amplification system produces in Puled input active optics resonant cavity by optical frequency pectination generator, control the chamber length of this active optics resonant cavity and the dispersion measure of injected pulse simultaneously, realize the coherent superposition of injected pulse in resonant cavity and spectrum widening, finally compressed by compression device paired pulses after pulse exports, obtain high-peak power, the ultrashort pulse of broadband spectral exports.
The object of the invention realizes being completed by following technical scheme:
A kind of self similarity ultrashort pulse amplification system based on active resonant cavity, it is characterized in that described self similarity ultrashort pulse amplification system comprises optical frequency pectination generator, prechirp management devices, active optics resonant cavity and the dispersion compensation device connected successively, wherein, described active optics resonant cavity is also connected with electronic control circuit and pump laser.
Described active optics resonant cavity is included in input coupling mirror, nonlinear crystal, outgoing mirror, curved mirror A, polarized controller, gain media and curved mirror B that light path connects successively, wherein, described input coupling mirror connects described prechirp management devices, described outgoing mirror connects described dispersion compensation device, the light path reflection angle of described curved mirror B points to described input coupling mirror, and described gain media connects described pump laser.
Described prechirp management devices is one or more combinations in chirped mirror, grating, prism, rib grid.
Described dispersion compensation device is one or more combinations in chirped mirror, grating, prism, rib grid.
A kind of method of work relating to arbitrary above-mentioned self similarity ultrashort pulse amplification system based on active resonant cavity, it is characterized in that described method of work comprises the steps: that described optical frequency pectination generator exports pulse, warble through described prechirp management devices paired pulses and carry out precompensation, afterpulse enter in described active optics resonant cavity through described input coupling mirror, described active optics resonator length is undertaken regulating and locking by described electronic control circuit, input pulse reflexes on described curved mirror A through described outgoing mirror, and focus on described gain media by described curved mirror A, under the effect that described pump laser encourages, pulse generation nonlinear optics is amplified, the pulse of amplifying reflexes to described input coupling mirror through described curved mirror B, the superimposed pulses in described active optics resonant cavity is entered with the next one, pulse after superposition continues transmission in chamber and amplifies, and so forth, pulse shaping self similarity amplifies, the further broadening of spectrum under the effect of described nonlinear crystal at Self-phase modulation, pulse after spectrum widening exports through described outgoing mirror, the pulse exported compensates because self similarity amplifies the dispersion introduced through described dispersion compensation device.
Described active optics resonator length is undertaken regulating and locking referring to by described electronic control circuit: be adjusted to long for described active optics resonator with the laser cavity appearance of described optical frequency pectination generator etc. or in integral multiple relation.
Advantage of the present invention is:
(1) adopt the structure of active resonant cavity, be exaggerated in burst transmissions process, compensate for the loss in resonant cavity in transmitting procedure, improve the pulse energy in resonant cavity;
(2) exocoel is adopted to strengthen technology, make pulse Multiple through then out gain media in resonant cavity, increase the number of times amplified in pulse and gain media, improve amplification efficiency, be conducive to forming similarity pulse transmission, widen the spectral width exporting pulse, be conducive to obtaining the ultrashort pulse narrower than incident pulse;
(3) adopt chirp management device to control the dispersion in resonant cavity, provide the mechanism that a kind of flexible control ultrashort pulse self similarity develops;
(4) adopt this nonlinear transmission means of similarity pulse transmission, effectively suppress amplified spontaneous emission, improve contrast ration;
(5) adopt optical frequency pectination generator as seed source, the carrier envelope offset frequency of its light pulse exported is 0, and repetition rate is stablized, and reduces the difficulty of the long precise hard_drawn tuhes of resonator, more easily obtains the pulse of coherent superposition;
(6) adopt the simple structure for amplifying of structure, improve the applicability of system, the optical frequency pectination generator for different-waveband can select different gain medias and components and parts to make amplifier;
(7) 2nd order chromatic dispersion in employing dispersive compensation element control resonant cavity and high-order dispersion, effectively suppress the carrier envelope phase skew that dispersion causes, and the pulse distortion that effective suppression high-order dispersion causes, improve pulse quality.
Accompanying drawing explanation
Fig. 1 is the principle schematic based on the self similarity ultrashort pulse amplification system of active resonant cavity in the present invention;
Fig. 2 is the schematic diagram based on the self similarity ultrashort pulse amplification system of active resonant cavity in the embodiment of the present invention 2;
Fig. 3 is the schematic diagram based on the self similarity ultrashort pulse amplification system of active resonant cavity in the embodiment of the present invention 3;
Fig. 4 is the schematic diagram based on the self similarity ultrashort pulse amplification system of active resonant cavity in the embodiment of the present invention 4.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technical staff of the same trade:
Be respectively as marked 100-600 in Fig. 1-4, figure:
Optical frequency pectination generator 100; Prechirp management devices 200, chirped mirror 201, chirped mirror 202, acousto-optic frequency shifters 203, etc. girdle prism 204, etc. girdle prism 205, height mirror 206, speculum 207, acousto-optic modulator 208, Prague balzed grating, 209, Prague balzed grating, 210, height mirror 211, speculum 212; Active optics resonant cavity 300, input coupling mirror 301, outgoing mirror 302, curved mirror 303, curved mirror 304, gain media 305, the long control device 306 in chamber, nonlinear crystal 307, polarized controller 308, electrooptic modulator 309; Electronic control circuit 400; Pump laser 500; Dispersion compensation device 600, chirped mirror 601, chirped mirror 602, rib grid compressor reducer 603, rib grid compressor reducer 604, Prague balzed grating, 605, Prague balzed grating, 606.
Embodiment 1: as shown in Figure 1, the present embodiment is specifically related to a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof, this self similarity ultrashort pulse amplification system comprises the optical frequency pectination generator 100, prechirp management devices 200, active optics resonant cavity 300 and the dispersion compensation device 600 that connect successively, active optics resonant cavity 300 is also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100 can be anyly locked repetition rate and carrier envelope frequency shift (FS) frequency is the ultrashort pulse laser of 0, comprise titanium-doped sapphire (Ti:S) laser, neodymium-doped, mix ytterbium, er-doped, thulium doped fiber (Nd, Yb, Er, Tm-dopedfiber) laser, mix chromium forsterite laser (Cr:Mg
2siO
4) etc. ultrashort pulse laser, fiber laser, the solid state laser of any wavelength.Optical frequency pectination generator 100 exports passive mode locking pulse, its locked mode mode can based on entity saturated absorbing body, protect and absorber based on the virtual of optical fiber, or based on kerr-lens effect, it exports carrier envelope phase and the repetition rate accurate locking simultaneously of pulse, realizes the time-frequency domain precise hard_drawn tuhes to laser pulse.
Prechirp management devices 200 refers to the pulse chirp adjusting device be made up of dispersive compensation element, can be made up of dispersion elements such as chirped mirror, grating, prism, rib grid, can the chirp value of regulating impulse.
Active optics resonant cavity 300 is finger ring shape or foldable structure, be included in input coupling mirror 301, nonlinear crystal 307, outgoing mirror 302, curved mirror 303, polarized controller 308, gain media 305 and curved mirror 304 that light path connects successively in the present embodiment, comprise the long control device 306 in the chamber be connected with electronic control circuit 400 in addition.Wherein: (a) inputs coupling mirror 301 and be connected with prechirp management devices 200; B () nonlinear crystal 307 refers to the crystal with larger non linear coefficient, comprise silicon dioxide (SiO
2), calcirm-fluoride (CaF
2), aluminium oxide (Al
2o
3) etc., require to select different nonlinear crystals flexibly according to different seed source wave bands and broadening; C part that () outgoing mirror 302 can realize pulse exports and part reflection, and the light path of output points to dispersion compensation device 600, and the light path of part reflection points to curved mirror 303; D () polarized controller 308 comprises the polarization-sensitive element such as polarizer, polarization beam apparatus, polarization dependent reflectance mirror, for keeping polarization state in resonant cavity constant; E () gain media 305 is connected with pump laser 500, gain media 305 is different according to the wave band of seed source, and can select suitable gain medium flexibly, the doped substrate of gain media is not limit; Pump laser 500 then according to the requirement of gain media 305 and seed source wavelength, selects superpower laser or the amplifier of suitable wave band; F the reflected light path of () curved mirror 304 points to input coupling mirror 301; G the long control device 306 in () chamber can be piezoelectric ceramic, refer to the device of refractive index or chamber scope sheet distance in the change chamber that controlled by electronic control circuit 400, in described change chamber, the method for refractive index has, regulate the voltage of Electric optical modulation in intra-cavity device, change the refractive index of electrooptic crystal, or control active cavity pumping source electric current, regulate gain media refractive index by pump power; Described change chamber scope sheet distance can utilize the eyeglass in chamber to be connected with piezoelectric ceramic, changes the voltage control cavity length of piezoelectric ceramic.
Dispersion compensation device 600 is made up of dispersion elements such as chirped mirror, grating, prism, rib grid, for carrying out dispersion compensation to the light pulse exported from active optics resonant cavity 300, and further compressed pulse widths.
As shown in Figure 1, the method for work of the self similarity ultrashort pulse amplification system based on active resonant cavity in the present embodiment comprises the steps:
(1) optical frequency pectination generator 100 outwards exports pulse as seed source, and the pulse of output should have repetition rate and stablize, and carrier envelope offset frequency is the characteristic of 0, the pulse exported is through prechirp management devices 200, prechirp management devices 200 paired pulses is warbled and is carried out precompensation, afterpulse through input coupling mirror 301 be directed in active optics resonant cavity 300, the long control device 306 in the chamber that chamber length is controlled by electronic control circuit 400 carries out regulating and accurate lock, to make the chamber of active resonant cavity 300 long with laser cavity appearance in optical frequency pectination generator 100 etc. or become integral multiple relation, the light pulse oscillate in chamber injected, when the carrier envelope phase of injected pulse and repetition rate are stablized, pulse light field coherent superposition, thus reach the object improving peak value of pulse intensity, polarization state in chamber is then controlled by polarized controller 308, guarantees to only have single polarised light to transmit in chamber,
(2) an input pulse part exports through speculum 302, another part reflexes on curved mirror 303 through speculum 302, and focus on gain media 305 by curved mirror 303, under the incentive action of pump laser 500, there is nonlinear optics amplification process, spectrum is broadened, and pulse amplitude is exaggerated;
(3) pulse of amplifying reflexes in input coupling mirror 301 through curved mirror 304, the superimposed pulses in active resonant cavity 300 is entered with the next one, pulse after superposition is transmitted in chamber, continue to amplify in gain media 305, constantly with the follow-up superimposed pulses entered in chamber, repeatedly through gain media 305, add the operating distance of pulse in gain media 5, pulse shaping self similarity amplifies, the continuous broadening of spectrum;
It should be noted that, because net dispersion amount in chamber is zero, after a circle is transmitted in pulse in chamber, the carrier envelope offset frequency of pulse is still 0, identical with the carrier envelope phase of second injected pulse, forms the coherent superposition of electric field, and pulse energy increases;
(4) pulse superposed has higher pulse energy, reflects through input coupling mirror 301, through nonlinear crystal 307, and the further broadening of spectrum under the effect of Self-phase modulation;
(5) pulse after spectrum widening exports through speculum 302, exports pulse and compensates because self similarity amplifies the dispersion introduced through dispersion compensation device 600, make net dispersion amount in active resonant cavity 300 close to 0.
Embodiment 2: as shown in Figure 2, the present embodiment is specifically related to a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof, this self similarity ultrashort pulse amplification system comprises the optical frequency pectination generator 100, prechirp management devices 200, active optics resonant cavity 300 and the dispersion compensation device 600 that connect successively, active optics resonant cavity 300 is also connected with electronic control circuit 400 and pump laser 500.Wherein:
Prechirp management devices 200 is made up of chirped mirror 201 and chirped mirror 202;
Active optics resonant cavity 300 is included in input coupling mirror 301, nonlinear crystal 307, outgoing mirror 302, curved mirror 303, polarized controller 308, gain media 305 and curved mirror 304 that light path connects successively, comprises the long control device 306 in the chamber be connected with electronic control circuit 400 in addition.
Dispersion compensation device 600 is made up of chirped mirror 201 and chirped mirror 202.
As shown in Figure 2, the method for work of the self similarity ultrashort pulse amplification system based on active resonant cavity in the present embodiment comprises the steps:
(1) optical frequency pectination generator 100 outwards exports pulse as seed source; The pulse exported is through a pair chirped mirror 201 and 202, paired pulses is warbled and is carried out precompensation, afterpulse through input coupling mirror 301 be directed in active optics resonant cavity 300, the long control device 306 in the chamber that chamber length is controlled by electronic control circuit 400 carries out regulating and accurate lock; Polarization state in chamber is then controlled by polarized controller 308, guarantees to only have single polarised light to transmit in chamber;
(2) an input pulse part exports through speculum 302, another part reflexes on curved mirror 303 through speculum 302, and focus on gain media 305 by curved mirror 303, under the incentive action of pump laser 500, there is nonlinear optics amplification process, spectrum is broadened, and pulse amplitude is exaggerated;
(3) pulse of amplifying reflexes in input coupling mirror 301 through curved mirror 304, the superimposed pulses in active resonant cavity 300 is entered with the next one, pulse after superposition is transmitted in chamber, continue to amplify in gain media 305, constantly with the follow-up superimposed pulses entered in chamber, repeatedly through gain media 305, add the operating distance of pulse in gain media 5, pulse shaping self similarity amplifies, the continuous broadening of spectrum;
(4) pulse superposed has higher pulse energy, reflects through input coupling mirror 301, through nonlinear crystal 307, and the further broadening of spectrum under the effect of Self-phase modulation;
(5) pulse after spectrum widening exports through speculum 302, exports pulse through another to chirped mirror 601 and 602, compensates because self similarity amplifies the dispersion introduced, make net dispersion amount in active resonant cavity 300 close to 0.
Embodiment 3: as shown in Figure 3, the present embodiment is specifically related to a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof, this self similarity ultrashort pulse amplification system comprises the optical frequency pectination generator 100, prechirp management devices 200, active optics resonant cavity 300 and the dispersion compensation device 600 that connect successively, active optics resonant cavity 300 is also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100 uses centre wavelength to comb as seed source at the Yb dosed optical fiber light that 1035nm, spectral width 30nm, pulse duration 130fs, power output are 1W;
Prechirp management devices 200 by acousto-optic frequency shifters 203, etc. girdle prism 204, etc. girdle prism 205, height mirror 206 and speculum 207 form;
Active optics resonant cavity 300 is included in input coupling mirror 301, nonlinear crystal 307, outgoing mirror 302, curved mirror 303, gain media 305, polarized controller 308 and curved mirror 304 that light path connects successively, and electronic control circuit 400 connects with pump laser 500.
The rib grid compressor reducer 603,604 that dispersion compensation device 600 is made up of the prism of a pair incisure density to be Prague balzed grating, 605,606 of 600l/mm and a pair material be SF10 forms.
As shown in Figure 3, the method for work of the self similarity ultrashort pulse amplification system based on active resonant cavity in the present embodiment comprises the steps:
(1) centered by optical frequency pectination generator 100 wavelength at 1035nm, spectral width 30nm, pulse duration 130fs, power output is the Yb dosed optical fiber light comb of 1W, the carrier envelope phase deviation frequency that it exports is compensated by acousto-optic frequency shifters 203, provide carrier envelope phase deviation frequency be 0 pulse export;
(2) drift angle using a pair material to be SF10 is 59 ° waiting girdle prism 204 and waiting girdle prism 205 as prechirp management devices, use height mirror 206 light path to be forced down again by waiting girdle prism 204 and waiting girdle prism 205, with another side speculum 207, outgoing pulse is reflexed in active optics resonant cavity 300;
(3) pulse of active optical resonator 300 is imported by input coupling mirror 301, after speculum 302 reflects, focus on gain media 305 by curved mirror 303,304, under the effect that pump laser 500 encourages, there is nonlinear optics amplification process, spectrum is broadened, and pulse amplitude is exaggerated;
(4) the chamber length of active optics resonant cavity 300 is controlled by electronic control circuit 400, control mode is for regulating pump laser 500 electric current, by fine adjustment electric current to regulate pump laser 500 power, thus the refractive index of ride gain medium 305, realize the precise hard_drawn tuhes long to active optics resonant cavity 300 chamber;
(5) gain media 305 selects the thick doping solubility of 5mm to be the Yb:YAG transparent ceramic material of 10.at%, and pump laser 500 selects the semiconductor laser of centre wavelength 940nm coupling fiber;
(6) polarization state of the pulse after amplifying is controlled by polarized controller 308, and polarized controller 308 comprises one piece of 1/2nd wave plate and one piece of Glan prism;
(7) pulse superposed has higher pulse energy, reflects through input coupling mirror 301, through nonlinear crystal 7, and the further broadening of spectrum under the effect of Self-phase modulation, nonlinear crystal selects one piece of thickness to be the silicon dioxide thin slice that 3mm is thick;
(8) pulse after superposition exports through speculum 302, export pulse to compress through another rib grid compressor reducer 603,604 to incisure density to be Prague balzed grating, 606,605 of 600l/mm and a pair material the be prism composition of SF10, compensate the 2nd order chromatic dispersion and high-order dispersion introduced in amplification process, final acquisition high-peak power, the ultrashort pulse of wide spectral exports.
Embodiment 4: as shown in Figure 4, the present embodiment is specifically related to a kind of self similarity ultrashort pulse amplification system based on active resonant cavity and method of work thereof, this self similarity ultrashort pulse amplification system comprises the optical frequency pectination generator 100, prechirp management devices 200, active optics resonant cavity 300 and the dispersion compensation device 600 that connect successively, active optics resonant cavity 300 is also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100 uses centre wavelength to comb as seed source at the Er-doped fiber light that 1560nm, spectral width 40nm, pulse duration 100fs, power output are 500mW;
Prechirp management devices 200 is made up of acousto-optic modulator 208, Prague balzed grating, 209, Prague balzed grating, 210, height mirror 211 and speculum 212;
Active optics resonant cavity 300 is included in input coupling mirror 301, electrooptic modulator 309, outgoing mirror 302, curved mirror 303, gain media 305, polarized controller 308 and curved mirror 304 that light path connects successively, and electrooptic modulator 309 connects with electronic control circuit 400.
The rib grid compressor reducer 603,604 that dispersion compensation device 600 is made up of the prism of a pair incisure density to be Prague balzed grating, 605,606 of 600l/mm and a pair material be SF10 forms.
As shown in Figure 4, the method for work of the self similarity ultrashort pulse amplification system based on active resonant cavity in the present embodiment comprises the steps:
(1) optical frequency pectination generator 100 uses centre wavelength to comb as seed source at the Er-doped fiber light that 1560nm, spectral width 40nm, pulse duration 100fs, power output are 500mW, optical frequency pectination generator 100 export carrier envelope phase deviation frequency compensated by acousto-optic modulator 208, provide carrier envelope phase deviation frequency be 0 pulse export;
(2) use Prague balzed grating, 209,210 of a pair 600l/mm as prechirp management devices, use height mirror 211 light path to be forced down again by Prague balzed grating, 209,210, with another side speculum 212, outgoing pulse is reflexed in active optics resonant cavity 300;
(3) pulse of active optical resonator 300 is imported by input coupling mirror 301, after speculum 302 reflects, focus on gain media 305 by curved mirror 303,304, under the effect that pump laser 500 encourages, there is nonlinear optics amplification process, spectrum is broadened, and pulse amplitude is exaggerated;
(4) active optics resonant cavity 300 chamber length is controlled by electronic circuit 400, and control mode is the drive current regulating electrooptic modulator (EOM) 309, realizes the precise hard_drawn tuhes long to active optics resonant cavity 300 chamber by fine adjustment drive current;
(5) gain media 305 selects the thick doping solubility of 6mm to be the Cr:YAG crystal of 6.at%, and pump laser 500 selects centre wavelength 1064nm ytterbium-doping optical fiber laser;
(6) polarization state through amplifying afterpulse is controlled by polarized controller 308, and polarized controller 308 comprises one piece of 1/2nd wave plate and one piece of polarization beam splitter prism;
(7) pulse after superposition exports through speculum 302, the pulse exported is compressed through another rib grid compressor reducer 603,604 to incisure density to be Prague balzed grating, 606,605 of 1000l/mm and a pair material the be prism composition of SF2, compensate the 2nd order chromatic dispersion and high-order dispersion introduced in amplification process, final acquisition high-peak power, the ultrashort pulse of wide spectral exports.
Claims (6)
1. the self similarity ultrashort pulse amplification system based on active resonant cavity, it is characterized in that described self similarity ultrashort pulse amplification system comprises optical frequency pectination generator, prechirp management devices, active optics resonant cavity and the dispersion compensation device connected successively, wherein, described active optics resonant cavity is also connected with electronic control circuit and pump laser.
2. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 1, it is characterized in that described active optics resonant cavity is included in input coupling mirror, nonlinear crystal, outgoing mirror, curved mirror A, polarized controller, gain media and the curved mirror B that light path connects successively, wherein, described input coupling mirror connects described prechirp management devices, described outgoing mirror connects described dispersion compensation device, the light path reflection angle of described curved mirror B points to described input coupling mirror, and described gain media connects described pump laser.
3. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 1, is characterized in that described prechirp management devices is one or more combinations in chirped mirror, grating, prism, rib grid.
4. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 1, is characterized in that described dispersion compensation device is one or more combinations in chirped mirror, grating, prism, rib grid.
5. one kind relates to arbitrary described method of work based on the self similarity ultrashort pulse amplification system of active resonant cavity in claim 1-4, it is characterized in that described method of work comprises the steps: that described optical frequency pectination generator exports pulse, warble through described prechirp management devices paired pulses and carry out precompensation, afterpulse enter in described active optics resonant cavity through described input coupling mirror, described active optics resonator length is undertaken regulating and locking by described electronic control circuit, input pulse reflexes on described curved mirror A through described outgoing mirror, and focus on described gain media by described curved mirror A, under the effect that described pump laser encourages, pulse generation nonlinear optics is amplified, the pulse of amplifying reflexes to described input coupling mirror through described curved mirror B, the superimposed pulses in described active optics resonant cavity is entered with the next one, pulse after superposition continues transmission in chamber and amplifies, and so forth, pulse shaping self similarity amplifies, the further broadening of spectrum under the effect of described nonlinear crystal at Self-phase modulation, pulse after spectrum widening exports through described outgoing mirror, the pulse exported compensates because self similarity amplifies the dispersion introduced through described dispersion compensation device.
6. the method for work of a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 5, is characterized in that described active optics resonator length is undertaken regulating and locking referring to by described electronic control circuit: be adjusted to long for described active optics resonator with the laser cavity appearance of described optical frequency pectination generator etc. or in integral multiple relation.
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| CN105896263A (en) * | 2016-05-11 | 2016-08-24 | 哈尔滨工业大学 | F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating method and device |
| CN105914573A (en) * | 2016-05-11 | 2016-08-31 | 哈尔滨工业大学 | Internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating method and device |
| CN105914574A (en) * | 2016-05-11 | 2016-08-31 | 哈尔滨工业大学 | Series frequency shift and three-mirror circular cavity internal dispersion compensation double-frequency comb generation method and device |
| CN105932527A (en) * | 2016-05-11 | 2016-09-07 | 哈尔滨工业大学 | Double-frequency comb generation method and apparatus based on parallel frequency shifters and 3-mirror ring cavities having outer-cavity dispersion compensators |
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| CN105896263A (en) * | 2016-05-11 | 2016-08-24 | 哈尔滨工业大学 | F-P cavity parallel frequency shift and external dispersion compensation double-frequency comb generating method and device |
| CN105914573A (en) * | 2016-05-11 | 2016-08-31 | 哈尔滨工业大学 | Internal dispersion compensation series frequency shift and four-mirror circular cavity double-frequency comb generating method and device |
| CN105914574A (en) * | 2016-05-11 | 2016-08-31 | 哈尔滨工业大学 | Series frequency shift and three-mirror circular cavity internal dispersion compensation double-frequency comb generation method and device |
| CN105932527A (en) * | 2016-05-11 | 2016-09-07 | 哈尔滨工业大学 | Double-frequency comb generation method and apparatus based on parallel frequency shifters and 3-mirror ring cavities having outer-cavity dispersion compensators |
| CN105932528A (en) * | 2016-05-11 | 2016-09-07 | 哈尔滨工业大学 | Method and apparatus for generating double-frequency comb by using 4-mirror ring cavities with external dispersion compensators and frequency shifters in parallel arrangement |
| CN111869020A (en) * | 2018-01-25 | 2020-10-30 | 马克斯-普朗克-格赛尔沙夫特科学促进协会 | Apparatus and method for generating laser pulses by kerr lens-based mode locking using loss modulation device as kerr medium |
| CN109995525A (en) * | 2019-03-26 | 2019-07-09 | 全球能源互联网研究院有限公司 | Method for transmitting signals, apparatus and system for quantum key dispatching system |
| CN109995525B (en) * | 2019-03-26 | 2021-08-06 | 全球能源互联网研究院有限公司 | Signal transmission method, device and system for quantum key distribution system |
| CN111755939A (en) * | 2020-06-27 | 2020-10-09 | 复旦大学 | Super-continuum spectrum generation device and super-continuum spectrum generation method |
| CN111755939B (en) * | 2020-06-27 | 2022-10-18 | 复旦大学 | Super-continuum spectrum generation device and super-continuum spectrum generation method |
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