CN105470794B - Self similarity ultrashort pulse amplification system and its working method based on active resonant cavity - Google Patents
Self similarity ultrashort pulse amplification system and its working method based on active resonant cavity Download PDFInfo
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- CN105470794B CN105470794B CN201610013655.1A CN201610013655A CN105470794B CN 105470794 B CN105470794 B CN 105470794B CN 201610013655 A CN201610013655 A CN 201610013655A CN 105470794 B CN105470794 B CN 105470794B
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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
- H01S3/05—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
Abstract
The invention discloses a kind of self similarity ultrashort pulse amplification system and its working method based on active resonant cavity, it is characterized in that the self similarity ultrashort pulse amplification system includes sequentially connected optical frequency pectination generator, prechirp managing device, active optics resonant cavity and dispersion compensation device, wherein, electronic control circuit and pump laser are also connected on the active optics resonant cavity.It is an advantage of the invention that, enhance technology based on exocoel, realize that the self similarity of ultrashort pulse amplifies using solid state gain medium, overcome gain narrowing, realize the non-linear broadening of the spectrum in amplification process, contrast ration is improved, and the problems such as the mode for effectively inhibiting fiber amplifier to encounter in high power amplification process is unstable, self-focusing；The system can be as research high field laser physics, the reliable scientific tools of nonlinear optics.
Description
Technical field
The invention belongs to technical field of ultrafast laser, and in particular to a kind of self similarity ultrashort pulse based on active resonant cavity
Amplification system and its working method.
Background technique
With the fast development of laser technology, there is high peak power, the ultrashort pulse light of extremely narrow pulse width
Into microcosmic ultrafast process field has directly been brought research and industrial production in source.In recent years, it is reduced to along with laser pulse width
Tens femtoseconds even several femtoseconds, ultrashort pulse fiber optic communication, nonlinear optics, optical sensing, micro-nano technology, medical treatment, swash
The fields such as light measurement play an increasingly important role.
Current high-peak power ultra-short pulse laser amplification system mainly uses chirped pulse amplification technique (CPA
Chirped-pulse amplification) Lai Tigao pulse peak power.The basic principle is that seed pulse enters amplification
Before device, its pulse width is broadened to several hundred picoseconds or even several nanoseconds, thus by its peak power using positive dispersion element
Several orders of magnitude are reduced, then chirped pulse is amplified in fiber amplifier, is pressed finally by negative dispersion element it
Contracting.In this way pulse quality and amplification efficiency can be improved to avoid the accumulation of nonlinear effect in amplification process.However for existing
Laser gain medium only just have maximum near atom centre frequency although there is very wide atom gain line width
Stimulated radiation section, so the spectrum component at pulse two edges cannot effectively be amplified in pulse amplifier, and in
Frequency of heart ingredient is sufficiently amplified, and which results in amplified pulse spectrums to narrow, i.e., so-called Gain-narrowing effect.Gain
Narrowing effect directly limits the spectrum width of high power pulse, and the most narrow pulse width and frequency spectrum of Optical Maser System output
Width be inversely proportional.Therefore reduce influence of the Gain-narrowing effect to high power ultra-short pulse laser device, have become high power
The important topic of femtosecond laser research field.
The self similarity amplifying technique (SSA, self-similarity amplification) proposed at the end of the 20th century utilizes
Longer high-gain positive dispersion fiber makes femtosecond pulse undergo self-similar transmission process in amplification process as gain media,
Frequency spectrum and pulse width broaden simultaneously, effectively inhibit Gain-narrowing effect, have high-gain, high efficiency, structure simple
Advantage causes the extensive concern of scientific research institution in recent years.The non-linear of pulse is utilized since self similarity amplifying technique belongs to
Transmission characteristic can effectively inhibit amplified spontaneous emission compared to using chirped pulse amplification technique as the Linear magnifying technology in high of representative
(ASE) contrast ration is improved.But existing self similarity amplifier requires pulse by sufficiently long gain fibre, just
Dispersion, nonlinear effect form self similarity under the collective effect of gain and develop.And existing gain fibre such as single mode gain light
Fine, doubly clad optical fiber, large mode area pcf etc. can be limited to self-focusing and the unstable effect of mode in high power again
Influence cause output facula quality deteriorate.This defect, which is seriously limited, obtains high-peak power using self similarity amplifying technique
Ultrashort pulse.
Summary of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of based on active resonant cavity from phase
Like ultrashort pulse amplification system and its working method, which passes through optical frequency pectination generator
It generates in pulse input active optics resonant cavity, while the long dispersion with injected pulse of the chamber for controlling the active optics resonant cavity
Amount realizes coherent superposition and spectrum widening of the injected pulse in resonant cavity, is finally compressed and is filled by pulse after pulse output
It sets and pulse is compressed, obtain the ultrashort pulse output of high-peak power, broadband spectral.
The object of the invention realization is completed by following technical scheme:
A kind of self similarity ultrashort pulse amplification system based on active resonant cavity, it is characterised in that the ultrashort arteries and veins of self similarity
Rush amplification system include sequentially connected optical frequency pectination generator, prechirp managing device, active optics resonant cavity and
Dispersion compensation device, wherein be also connected with electronic control circuit and pump laser on the active optics resonant cavity.
The active optics resonant cavity include in optical path sequentially connected Input coupling mirror, nonlinear crystal, outgoing mirror,
Curved mirror A, polarized controller, gain media and curved mirror B, wherein the Input coupling mirror connects the prechirp management
Device, the outgoing mirror connect the dispersion compensation device, and the optical path reflection angle of the curved mirror B is directed toward the input coupling
Mirror, the gain media connect the pump laser.
The prechirp managing device is one of chirped mirror, grating, prism, rib or multiple combinations.
The dispersion compensation device is one of chirped mirror, grating, prism, rib or multiple combinations.
It is a kind of to be related to the working method of any above-mentioned self similarity ultrashort pulse amplification system based on active resonant cavity, spy
Sign is that the working method includes the following steps: the optical frequency pectination generator output pulse, through the prechirp pipe
Reason device pre-compensates for pulse chirp；Afterpulse through the Input coupling mirror enter the active optics resonant cavity in,
The active optics cavity length of the resonator chamber is adjusted and is locked by the electronic control circuit, and input pulse is anti-through the outgoing mirror
It is mapped on the curved mirror A, and is focused on the gain media by the curved mirror A, in pump laser excitation
Under effect, pulse generation nonlinear optics amplification, the pulse of amplification is reflected into the Input coupling mirror through the curved mirror B, with
Next superimposed pulses into the active optics resonant cavity, superimposed pulse continue to amplify in intracavitary transmission, so
Back and forth, pulse shaping self similarity amplifies, and by the nonlinear crystal, spectrum is further broadened under the action of Self-phase modulation,
Pulse after spectrum widening is exported through the outgoing mirror；The pulse of output is compensated through the dispersion compensation device since self similarity is put
The dispersion introduced greatly.
The active optics cavity length of the resonator chamber, which is adjusted and is locked by the electronic control circuit, to be referred to: will be described active
Optical resonator chamber is long to be adjusted to equal with the laser cavity of optical frequency pectination generator length or in integral multiple relation.
The invention has the advantages that
(1) structure of active resonant cavity is used, is amplified in pulse transmission process, compensates for the transmission process in resonant cavity
In loss, improve the pulse energy in resonant cavity；
(2) technology is enhanced using exocoel, so that pulse multipass gain media in resonant cavity, increases pulse and gain
The number amplified in medium, improves amplification efficiency, advantageously forms similarity pulse transmission, has widened the spectrum of output pulse
Width help to obtain the ultrashort pulse more narrower than incident pulse；
(3) dispersion in resonant cavity is controlled using chirp management device, provides one kind and flexibly controls ultrashort arteries and veins
Rush the mechanism of self similarity evolution；
(4) this nonlinear transmission mode is transmitted using similarity pulse, effectively inhibits amplified spontaneous emission, improved
Contrast ration；
(5) using optical frequency pectination generator as seed source, the carrier envelope offset frequency of the light pulse of output
It is 0, repetition rate is stablized, and reduces the difficulty of cavity length of the resonator chamber precision control, it is easier to obtain the pulse of coherent superposition；
(6) the simple enlarged structure of structure is used, the applicability of system is improved, for the optical frequency com of different-waveband
Shape generator can choose different gain media and component production amplifier；
(7) using the second-order dispersion and high-order dispersion in dispersive compensation element control resonant cavity, effectively dispersion is inhibited to cause
Carrier envelope phase offset, and effectively inhibit high-order dispersion caused by pulse distortion, improve pulse quality.
Detailed description of the invention
Fig. 1 is the schematic illustration of the self similarity ultrashort pulse amplification system based on active resonant cavity in the present invention；
Fig. 2 is the schematic diagram of the self similarity ultrashort pulse amplification system based on active resonant cavity in the embodiment of the present invention 2；
Fig. 3 is the schematic diagram of the self similarity ultrashort pulse amplification system based on active resonant cavity in the embodiment of the present invention 3；
Fig. 4 is the schematic diagram of the self similarity ultrashort pulse amplification system based on active resonant cavity in the embodiment of the present invention 4.
Specific embodiment
Feature of the invention and other correlated characteristics are described in further detail by embodiment below in conjunction with attached drawing, with
Convenient for the understanding of technical staff of the same trade:
Picture 1-4,100-600 is marked to be respectively as follows: in figure
Optical frequency pectination generator 100；Prechirp managing device 200, chirped mirror 201, chirped mirror 202, acousto-optic frequency translation
Device 203, etc. girdle prisms 204, etc. girdle prisms 205, height mirror 206, reflecting mirror 207, acousto-optic modulator 208, Prague glare
Grid 209, Prague balzed grating, 210, height mirror 211, reflecting mirror 212；Active optics resonant cavity 300, Input coupling mirror 301,
The long control device 306 of outgoing mirror 302, curved mirror 303, curved mirror 304, gain media 305, chamber, nonlinear crystal 307, polarization
Control device 308, electrooptic modulator 309；Electronic control circuit 400；Pump laser 500；Dispersion compensation device 600, chirp
Mirror 601, chirped mirror 602, rib compressor 603, rib compressor 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 based on active resonant cavity
Amplification system and its working method, the self similarity ultrashort pulse amplification system include sequentially connected optical frequency pectination generator
100, prechirp managing device 200, active optics resonant cavity 300 and dispersion compensation device 600, active optics resonant cavity 300
On be also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100, which can be, any has locked repetition rate and carrier envelope frequency shift (FS) frequency is
0 ultrashort pulse laser, including titanium-doped sapphire (Ti:S) laser, neodymium-doped, mix ytterbium, er-doped, thulium doped fiber (Nd, Yb,
Er, Tm-doped fiber) laser, mix chromium forsterite laser (Cr:Mg2SiO4) etc. the ultrashort pulse of any wavelength swash
Light device, optical fiber laser, solid state laser.Optical frequency pectination generator 100 exports passive mode-locking pulse, and mode locking mode can
To be based on entity saturated absorbing body, virtual based on optical fiber protects and absorber, or is based on kerr-lens effect, output
The accurate locking simultaneously of the carrier envelope phase and repetition rate of pulse, realizes and controls the time-frequency domain precision of laser pulse.
Prechirp managing device 200 refers to the pulse chirp regulating device being made of dispersive compensation element, can be by chirp
The dispersion elements such as mirror, grating, prism, rib are constituted, the chirp value of adjustable pulse.
Active optics resonant cavity 300 is finger ring shape or foldable structure, includes successively connecting in the present embodiment in optical path
The Input coupling mirror 301 that connects, nonlinear crystal 307, outgoing mirror 302, curved mirror 303, polarized controller 308, gain media
305 and curved mirror 304, it additionally include the long control device 306 of chamber being connect with electronic control circuit 400.Wherein :(a) defeated
Enter coupling mirror 301 to be connected with prechirp managing device 200；(b) nonlinear crystal 307 refers to larger nonlinear factor
Crystal, including silica (SiO2), calcirm-fluoride (CaF2), aluminium oxide (Al2O3) etc., according to different seed source wave bands and exhibition
Wide requirement can be different with flexible choice nonlinear crystal；(c) outgoing mirror 302 can realize that the part output of pulse and part are anti-
It penetrates, the optical path of output par, c is directed toward dispersion compensation device 600, and the optical path of part reflection is directed toward curved mirror 303；(d) Polarization Control
Device 308 includes the polarization-sensitive elements such as polarizing film, polarization beam apparatus, polarization dependent reflectance mirror, for keeping in resonant cavity partially
Polarization state is constant；(e) gain media 305 is connected with pump laser 500, and gain media 305 is different according to the wave band of seed source,
Can the suitable laser gain medium of flexible choice, the doped substrate of gain media is unlimited；And pump laser 500 is then according to gain
The requirement of medium 305 and seed source wavelength selects the superpower laser or amplifier of suitable wave band；(f) curved mirror 304 is anti-
It penetrates optical path and is directed toward Input coupling mirror 301；(g) the long control device 306 of chamber can be piezoelectric ceramics, refer to by electronic control circuit
The device for changing intracavitary refractive index or intracavitary eyeglass distance of 400 controls, the method for changing intracavitary refractive index have, adjust
The voltage of Electric optical modulation in intra-cavity device changes the refractive index of electro-optic crystal, or control active cavity pumps ource electric current, by pump power
Adjust gain media refractive index；The intracavitary eyeglass distance of change can use intracavitary eyeglass and connect with piezoelectric ceramics, change
The voltage of piezoelectric ceramics controls cavity length.
Dispersion compensation device 600 is made of dispersion elements such as chirped mirror, grating, prism, ribs, for from active optics
The light pulse that resonant cavity 300 exports carries out dispersion compensation, further compressed pulse widths.
As shown in Figure 1, the working method of the self similarity ultrashort pulse amplification system in the present embodiment based on active resonant cavity
Include the following steps:
(1) optical frequency pectination generator 100 exports pulse as seed source outward, and the pulse of output should have repetition frequency
Rate is stablized, the characteristic that carrier envelope offset frequency is 0；Prechirp managing device 200, prechirp management dress are passed through in the pulse of output
200 pairs of pulse chirps are set to pre-compensate for, afterpulse be directed into active optics resonant cavity 300 through Input coupling mirror 301, chamber
The long long control device 306 of chamber controlled by electronic control circuit 400 is adjusted and accurate lock, so that active resonant cavity 300
Chamber it is long grow with laser cavity in optical frequency pectination generator 100 equal or at integral multiple relation, the light pulse of injection is intracavitary
It vibrates back and forth, when the carrier envelope phase of injected pulse and stable repetition rate, pulse light field coherent superposition mentions to reach
The purpose of high impulse peak strength；Intracavitary polarization state is then controlled by polarized controller 308, it is ensured that intracavitary only single polarization
Optical transport；
(2) input pulse a part reflexes to curved mirror 303 through reflecting mirror 302 through the output of reflecting mirror 302, another part
On, and focused on gain media 305 by curved mirror 303, under the incentive action of pump laser 500, nonlinear optical occurs
Amplification process is learned, spectrum is broadened, and impulse amplitude is amplified；
(3) pulse amplified is reflected into Input coupling mirror 301 through curved mirror 304, enters active resonant cavity with next
Superimposed pulses in 300, superimposed pulse continue to amplify in intracavitary transmission in gain media 305, constantly with subsequent entrance
Intracavitary superimposed pulses repeatedly pass through gain media 305, increase operating distance of the pulse in gain media 5, pulse shaping
Self similarity amplification, spectrum constantly broaden；
It should be noted that pulse is after intracavitary one circle of transmission, the carrier envelope of pulse since intracavitary net dispersion amount is zero
Deviation frequency remains as 0, identical as the carrier envelope phase of second injected pulse, forms the coherent superposition of electric field, pulse energy
Amount increases；
(4) the pulse pulse energy with higher being superimposed is reflected by Input coupling mirror 301, by nonlinear crystal
307, spectrum further broadens under the action of Self-phase modulation；
(5) pulse after spectrum widening is exported by reflecting mirror 302, and output pulse is compensated by dispersion compensation device 600
Due to the dispersion that self similarity amplification introduces, make net dispersion amount in active resonant cavity 300 close to 0.
Embodiment 2: as shown in Fig. 2, the present embodiment is specifically related to a kind of self similarity ultrashort pulse based on active resonant cavity
Amplification system and its working method, the self similarity ultrashort pulse amplification system include sequentially connected optical frequency pectination generator
100, prechirp managing device 200, active optics resonant cavity 300 and dispersion compensation device 600, active optics resonant cavity 300
On be also connected with electronic control circuit 400 and pump laser 500.Wherein:
Prechirp managing device 200 is made of chirped mirror 201 and chirped mirror 202；
Active optics resonant cavity 300 includes the sequentially connected Input coupling mirror 301, nonlinear crystal 307, defeated in optical path
Appearance 302, curved mirror 303, polarized controller 308, gain media 305 and curved mirror 304 additionally include and electronics control
The long control device 306 of chamber that route 400 processed connects.
Dispersion compensation device 600 is made of chirped mirror 201 and chirped mirror 202.
As shown in Fig. 2, the working method of the self similarity ultrashort pulse amplification system in the present embodiment based on active resonant cavity
Include the following steps:
(1) optical frequency pectination generator 100 exports pulse as seed source outward；The pulse of output is by a pair of of chirp
Mirror 201 and 202, pre-compensates for pulse chirp, afterpulse be directed into active optics resonant cavity through Input coupling mirror 301
In 300, the long long control device 306 of chamber controlled by electronic control circuit 400 of chamber is adjusted and accurate lock；Intracavitary polarization
State is then controlled by polarized controller 308, it is ensured that intracavitary only single polarization optical transport；
(2) input pulse a part reflexes to curved mirror 303 through reflecting mirror 302 through the output of reflecting mirror 302, another part
On, and focused on gain media 305 by curved mirror 303, under the incentive action of pump laser 500, nonlinear optical occurs
Amplification process is learned, spectrum is broadened, and impulse amplitude is amplified；
(3) pulse amplified is reflected into Input coupling mirror 301 through curved mirror 304, enters active resonant cavity with next
Superimposed pulses in 300, superimposed pulse continue to amplify in intracavitary transmission in gain media 305, constantly with subsequent entrance
Intracavitary superimposed pulses repeatedly pass through gain media 305, increase operating distance of the pulse in gain media 5, pulse shaping
Self similarity amplification, spectrum constantly broaden；
(4) the pulse pulse energy with higher being superimposed is reflected by Input coupling mirror 301, by nonlinear crystal
307, spectrum further broadens under the action of Self-phase modulation；
(5) pulse after spectrum widening is exported by reflecting mirror 302, and 601 He of another pair chirped mirror is passed through in output pulse
602, the dispersion introduced due to self similarity amplification is compensated, makes 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 based on active resonant cavity
Amplification system and its working method, the self similarity ultrashort pulse amplification system include sequentially connected optical frequency pectination generator
100, prechirp managing device 200, active optics resonant cavity 300 and dispersion compensation device 600, active optics resonant cavity 300
On be also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100 using central wavelength 1035nm, spectral width 30nm, pulse width 130fs,
Output power is the Yb dosed optical fiber light comb of 1W as seed source；
Prechirp managing device 200 by acousto-optic frequency shifters 203, etc. girdle prisms 204, etc. girdle prisms 205, height mirror 206 with
And reflecting mirror 207 forms；
Active optics resonant cavity 300 includes the sequentially connected Input coupling mirror 301, nonlinear crystal 307, defeated in optical path
Appearance 302, curved mirror 303, gain media 305, polarized controller 308 and curved mirror 304, electronic control circuit 400 are same
Pump laser 500 connects.
Dispersion compensation device 600 is by Prague balzed grating, 605,606 that a pair of of incisure density is 600l/mm and a pair of of material
The rib compressor 603,604 that the prism that material is SF10 forms forms.
As shown in figure 3, the working method of the self similarity ultrashort pulse amplification system in the present embodiment based on active resonant cavity
Include the following steps:
(1) optical frequency pectination generator 100 is center wavelength in 1035nm, spectral width 30nm, pulse width
130fs, output power are the Yb dosed optical fiber light comb of 1W, and the carrier envelope phase deviation frequency exported is by acousto-optic frequency shifters
203 compensation provide the pulse that carrier envelope phase deviation frequency is 0 and export；
(2) the equal girdle prisms 204 and equal girdle prisms 205 that the apex angle for using a pair of of material to be SF10 is 59 ° are as prechirp
Optical path is forced down again by equal girdle prisms 204 using height mirror 206 and waits girdle prisms 205, reflected with another side by managing device
Outgoing pulse is reflected into active optics resonant cavity 300 by mirror 207；
(3) pulse that active optical resonator 300 is imported by Input coupling mirror 301, after the reflection of reflecting mirror 302, by song
Face mirror 303,304 focuses on gain media 305, and under the action of pump laser 500 motivates, nonlinear optics amplification occurs
Process, spectrum are broadened, and impulse amplitude is amplified；
(4) the chamber length of active optics resonant cavity 300 is controlled by electronic control circuit 400, and control mode is to adjust pumping to swash
500 electric current of light device, by accurately adjusting electric current to adjust 500 power of pump laser, to control the refraction of gain media 305
Rate realizes the accurate control long to 300 chamber of active optics resonant cavity；
(5) gain media 305 selects the Yb:YAG transparent ceramic material that 5mm thickness doping solubility is 10.at%, pumping laser
The semiconductor laser of the selection central wavelength 940nm fiber coupling of device 500；
(6) polarization state Jing Guo amplified pulse is controlled by polarized controller 308, and polarized controller 308 includes
One block of half wave plate and one piece of Glan prism；
(7) the pulse pulse energy with higher being superimposed is reflected by Input coupling mirror 301, by nonlinear crystal
7, spectrum further broadens under the action of Self-phase modulation, and nonlinear crystal selects one block of silica with a thickness of 3mm thickness
Thin slice；
(8) superimposed pulse is exported by reflecting mirror 302, and output pulse is 600l/mm by another pair incisure density
Prague balzed grating, 606,605 and a pair of of material be SF10 the rib compressor 603,604 that forms of prism compressed,
The second-order dispersion and high-order dispersion introduced in compensation amplification process, finally obtains high-peak power, the ultrashort pulse of wide spectrum is defeated
Out.
Embodiment 4: as shown in figure 4, the present embodiment is specifically related to a kind of self similarity ultrashort pulse based on active resonant cavity
Amplification system and its working method, the self similarity ultrashort pulse amplification system include sequentially connected optical frequency pectination generator
100, prechirp managing device 200, active optics resonant cavity 300 and dispersion compensation device 600, active optics resonant cavity 300
On be also connected with electronic control circuit 400 and pump laser 500.Wherein:
Optical frequency pectination generator 100 using central wavelength 1560nm, spectral width 40nm, pulse width 100fs,
Output power is the Er-doped fiber light comb of 500mW as seed source；
Prechirp managing device 200 by acousto-optic modulator 208, Prague balzed grating, 209, Prague balzed grating, 210,
Height mirror 211 and reflecting mirror 212 form；
Active optics resonant cavity 300 includes the sequentially connected Input coupling mirror 301, electrooptic modulator 309, defeated in optical path
Appearance 302, curved mirror 303, gain media 305, polarized controller 308 and curved mirror 304, electrooptic modulator 309 is the same as electricity
Son control route 400 connects.
Dispersion compensation device 600 is by Prague balzed grating, 605,606 that a pair of of incisure density is 600l/mm and a pair of of material
The rib compressor 603,604 that the prism that material is SF10 forms forms.
As shown in figure 4, the working method of the self similarity ultrashort pulse amplification system in the present embodiment based on active resonant cavity
Include the following steps:
(1) optical frequency pectination generator 100 is using central wavelength in 1560nm, spectral width 40nm, pulse width
The carrier wave that 100fs, the Er-doped fiber light comb that output power is 500mW are exported as seed source, optical frequency pectination generator 100
Envelope phase deviation frequency is compensated by acousto-optic modulator 208, is provided the pulse that carrier envelope phase deviation frequency is 0 and is exported；
(2) it uses Prague balzed grating, 209,210 of a pair of 600l/mm as prechirp managing device, uses height
Mirror 211 forces down optical path again by Prague balzed grating, 209,210, is reflected outgoing pulse with another side reflecting mirror 212
Into active optics resonant cavity 300；
(3) pulse that active optical resonator 300 is imported by Input coupling mirror 301, after the reflection of reflecting mirror 302, by song
Face mirror 303,304 focuses on gain media 305, and under the action of pump laser 500 motivates, nonlinear optics amplification occurs
Process, spectrum are broadened, and impulse amplitude is amplified；
(4) 300 chamber of active optics resonant cavity length is controlled by electronic circuit 400, and control mode is to adjust electrooptic modulator
(EOM) 309 driving current realizes the accurate control long to 300 chamber of active optics resonant cavity by accurately adjusting driving current；
(5) gain media 305 selects the Cr:YAG crystal that 6mm thickness doping solubility is 6.at%, and pump laser 500 is selected
Central wavelength 1064nm ytterbium-doping optical fiber laser；
(6) it is controlled by the polarization state of amplification afterpulse by polarized controller 308, polarized controller 308 includes one
Block half wave plate and one piece of polarization beam splitter prism；
(7) superimposed pulse is exported by reflecting mirror 302, and the pulse of output is 1000l/ by another pair incisure density
The rib compressor 603,604 that the prism that Prague balzed grating, 606,605 of mm and a pair of of material are SF2 forms is pressed
Contracting compensates the second-order dispersion and high-order dispersion introduced in amplification process, finally obtains high-peak power, the ultrashort pulse of wide spectrum
Output.
Claims (5)
1. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity, it is characterised in that the self similarity ultrashort pulse
Amplification system includes sequentially connected optical frequency pectination generator, prechirp managing device, active optics resonant cavity and color
Dissipate compensation device, wherein be also connected with electronic control circuit and pump laser on the active optics resonant cavity；It is described to have
Source optical resonator includes sequentially connected Input coupling mirror, nonlinear crystal, outgoing mirror, curved mirror A, polarization control in optical path
Device, gain media and curved mirror B processed, wherein the Input coupling mirror connects the prechirp managing device, the outgoing mirror
The dispersion compensation device is connect, the optical path reflection angle of the curved mirror B is directed toward the Input coupling mirror, and the gain media connects
Connect the pump laser.
2. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 1, feature exist
In the prechirp managing device be one of chirped mirror, grating, prism or multiple combinations.
3. a kind of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 1, feature exist
In the dispersion compensation device be one of chirped mirror, grating, prism or multiple combinations.
4. a kind of be related to the work of any self similarity ultrashort pulse amplification system based on active resonant cavity in claim 1-3
Make method, it is characterised in that the working method includes the following steps: that optical frequency pectination generator exports pulse, through prechirp
Managing device pre-compensates for pulse chirp；Afterpulse enter in active optics resonant cavity through Input coupling mirror, it is described to have
Optical resonator chamber length in source is adjusted and is locked by electronic control circuit, and input pulse is reflected on curved mirror A through outgoing mirror,
And focused on gain media by the curved mirror A, under the action of pump laser excitation, pulse generation nonlinear optics is put
Greatly, the pulse of amplification is reflected into the Input coupling mirror through curved mirror B, with next into the active optics resonant cavity
Superimposed pulses, superimposed pulse continue to amplify in intracavitary transmission, and and so on, pulse shaping self similarity amplifies, and process is non-thread
Property crystal spectrum under the action of Self-phase modulation further broadens, and the pulse after spectrum widening is exported through the outgoing mirror；It is defeated
The dispersion that pulse dispersion compensating device compensation out is introduced due to self similarity amplification.
5. a kind of work side of self similarity ultrashort pulse amplification system based on active resonant cavity according to claim 4
Method, it is characterised in that the active optics cavity length of the resonator chamber, which is adjusted and is locked by the electronic control circuit, to be referred to: by institute
Active optics cavity length of the resonator chamber is stated to be adjusted to equal with the laser cavity of optical frequency pectination generator length or close in integral multiple
System.
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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