CN100550541C - Chirp pulse regeneration amplification method for pump light enhanced light parameter - Google Patents
Chirp pulse regeneration amplification method for pump light enhanced light parameter Download PDFInfo
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- CN100550541C CN100550541C CNB2008100364303A CN200810036430A CN100550541C CN 100550541 C CN100550541 C CN 100550541C CN B2008100364303 A CNB2008100364303 A CN B2008100364303A CN 200810036430 A CN200810036430 A CN 200810036430A CN 100550541 C CN100550541 C CN 100550541C
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Abstract
The present invention relates to a kind of novel optical parameter chirped pulse amplification method, this method utilizes the structure in ring-like chamber that former pump light is carried out stack enhancing in the chamber, to strengthen the power density of pump light, utilize flashlight and the pump light optical path difference in chamber separately again, realize the recycling of pump light, to improve transformation efficiency, adopt the parameter of cavity dumping choice of technology the best to amplify number of times at last, saturation effect in the control parametric process, wherein former pump light is carried out stack enhancing in the chamber, it is the structure of utilizing ring-like chamber, make the pump light pulse front edge and after prolong in the chamber and superpose, its advantage is when utilizing the high-octane pumping source of wide pulse width to obtain the output of high-energy short pulse, can improve the transformation efficiency of pump light to greatest extent.
Description
Technical field
The present invention relates to a kind of novel optical parameter chirped pulse amplification method, belong to ultrafast laser pulse amplifying technique, this method combines the characteristics that stack strengthens in many logical parameters amplifications and the chamber, can realize making full use of of pump energy, thereby optimize conversion efficiency.
Background technology
The high single pulse energy of high-peak power is the important means of matter interaction under the extreme physical condition of research, has become at present one of popular domain of research both at home and abroad so how to obtain ultrashort intense laser pulse.The three kinds of methods that mainly contain are amplified in light pulse at present: the one, and chirped pulse (CPA) amplification way, be with femtosecond seed optical pulse broadening on time domain, amplify through gain medium again, utilize the compressor compresses pulsewidth to obtain ultrashort pulse at last, in the CPA system, generally all to pass through multistage amplification, reach capacity gain after the output of turned letter chamber, in the CPA system, though can obtain high-gain, but exist many shortcomings simultaneously: the spontaneous radiation signal obtains amplifying, and is not high through the light pulse contrast of CPA output; The amplification step by step of pulse, the spectrum narrowing effect is obvious more, makes to be difficult to be compressed to original femtosecond magnitude.The 2nd, optical parameter chirped pulse amplification method, can obtain bigger single pulse energy and peak power, its parametric process can be supported very wide spectral width, so the OPCPA system can produce very short laser pulse, its principle be exactly utilize nonlinear crystal the Conversion of energy of pump light in flashlight, just need high-octane pump light so will obtain the output of high pulse energy.In the phototiming pumping system, titanium jewel femtosecond laser (femtosecondTi:sapphire system) system output pulse part is as the seed light of OPCPA, as pump light, its single pulse energy (10mJ) has limited the raising of output pulse energy to another part behind many logical amplifications.It is burnt that the pulse energy of YAG laser output can reach a hundreds of milli, can solve this problem as pumping source with it, but because the optical pulse width of YAG laser output is ten nanosecond, and experimentally be difficult to femtosecond flashlight broadening is become ten nanosecond orders, make in the optical parameter mechanism, have only the synchronous energy of small part and flashlight to obtain utilizing, conversion efficiency is lower.In order to overcome this shortcoming, existing in the world at present many research groups have proposed the notion that many logical optical parameters are amplified, but because the saturation effect in the parametric process also can't solve the contradiction between maximal efficiency and the Duo Tong number of times at present experimentally.The 3rd, coherent superposition method in the light pulse chamber, people such as R.Jason Jones proposed the thought that coherent superposition is amplified femtosecond pulse in the light pulse chamber in 2002, the strict carrier phase of this method is stablized, and the pattern matching condition is comparatively strict, still is difficult to experimentally realize.
In sum, though the technology that ultrashort pulse is at present amplified is a lot, all exist various shortcomings and deficiencies.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art part, a kind of chirp pulse regeneration amplification method for pump light enhanced light parameter is provided, this method utilizes the special construction in ring-like chamber that first pump light is carried out stack enhancing in the chamber, and utilize flashlight and the pump light optical path difference in chamber separately to realize the recycling of pump light, utilize the cavity dumping technology to control saturation effect in the parametric process simultaneously, not only solved the problem that flashlight saturation effect and pump light can not efficiently utilize, realized that also the thought of utilizing the interior stack of pumping optical cavity to strengthen improves the transformation efficiency of pump light.
The object of the invention realizes being finished by following technical scheme:
A kind of chirp pulse regeneration amplification method for pump light enhanced light parameter, it is characterized in that structure that this method is utilized ring-like chamber carries out to former pump light that stack strengthens in the chamber, to strengthen the power density of pump light, utilize flashlight and the pump light optical path difference in chamber separately again, realize the recycling of pump light, to improve transformation efficiency, adopt the parameter of cavity dumping choice of technology the best to amplify number of times at last, saturation effect in the control parametric process, wherein former pump light is carried out stack enhancing in the chamber, be the structure of utilizing ring-like chamber, make the pump light pulse front edge and after prolong in the chamber and superpose.
The structure in described ring-like chamber is the pulsewidth τ according to pump light
0Determine the long L in chamber of pumping optical cavity, this chamber length makes the pump light required time τ=L/c＜τ of a week that circulates in pump cavity
0, c wherein is the light velocity.
The realization of described optical path difference is: adopt two ring-like chambeies, be pumping optical cavity and signal optical cavity, ring-like cavity configuration makes circulate in a chamber week back and pump light of flashlight that a delay be arranged in time, utilizes this to postpone to realize that flashlight carries out the parameter amplification again with another part pump light.
Described cavity dumping technology is when the signal pulse gain reaches maximum, changes the signal polarization state of light, and is reflexed to outside the chamber by the Brewster window.
Advantage of the present invention is when utilizing the high-octane pumping source of wide pulse width to obtain the output of high-energy short pulse, can improve the transformation efficiency of pump light to greatest extent.
Description of drawings
Accompanying drawing 1 is that stack strengthens schematic diagram in the pumping optical cavity;
Accompanying drawing 2 is schematic diagrams of optical parameter regenerative amplification;
Accompanying drawing 3 is in pulse menu and the synchro system light and circuit diagram;
Accompanying drawing 4 is index paths of optical parameter regenerative amplification;
Accompanying drawing 5 is sequential charts of menu and synchro system.
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 technical staff's of the same trade understanding:
Shown in Fig. 1-5, symbol is represented respectively among the figure: τ is circulate in the chamber time τ in a week of the light by the long decision in chamber, a is for entering the pumping pulse forward position in the chamber at first, b is the intensity after preceding two T time inside-pumping superimposed pulses, c is the intensity after first three T time inside-pumping superimposed pulses, d is the pulse strength after last stack strengthens, e is the flashlight before the parameter effect, f is a pumping light intensity before the parameter effect, g is that signal light intensity distributes after the parameter effect for the first time, and h is pump light light distribution after the parameter effect for the first time.1, titanium jewel femtosecond pulse, 2, homocentric diffraction does not have aberration stretcher, 3, photodetector, 4, the YAG Q-switched laser, 5, beam splitting chip, 6, numeral (SDGII) pulse delay unit, 7, Pockers cell, 8, polarizer, 9, high-voltage pulse generator (OHA), 10, the coupling mirror of pump light in the P chamber, 11, YAG frequency doubled light plane high reflective mirror, 12, flashlight high reflective mirror in the S chamber, 13, Pockers cell, 14, the flashlight high reflective mirror, 15, the Brewster window, 16, frequency-doubling crystal, 17, parameter amplifies crystal, 18, delay modulator, I, the YAG pulse triggering signal, II, high-voltage pulse signal, III, high-voltage pulse signal, IV, the signal pulse of selecting.
Present embodiment relates to following technology:
It at first is stack amplifying technique in the pumping optical cavity, in the optical parameter enhanced system, the pulsewidth of pump light (P light) is than the big several magnitudes of pulsewidth of flashlight, though can adopt many logical technology to increase the utilance of P light, but because the existence of saturation effect, the energy of P light still is not used in the overwhelming majority time.To amplify be exactly the special construction that utilizes ring-like chamber in stack in the so-called pumping optical cavity, make P light pulse forward position and after prolong in the chamber and superpose.Concrete method is the pulsewidth τ according to P light
0Design the long L in chamber of pumping optical cavity (P chamber), make the P light required time T=L/c＜τ of a week that in the P chamber, circulates
0. its principle is equivalent to P light is compressed in time, makes the power density P of pump light
0Increase to
The electric field strength of corresponding P light has also increased
Next is the controlled time delay technology of pump light and flashlight, non-colinear parameter structure for amplifying has not only improved the phase matched width, and since the S light of P light not on same straight line, can adopt two ring-like chambeies: pumping optical cavity (P chamber) and signal optical cavity (S chamber), utilize the different length in chamber come control signal light with each time portion of pump light synchronously.Ring-like cavity configuration makes circulate in a chamber week back and pump light of flashlight that a delay be arranged in time, utilizes this to postpone to realize that flashlight carries out the parameter amplification again with another part pump light.Concrete realizing method is according to the pulsewidth t behind the S light broadening
0, the design long L in chamber, P chamber
pThan the long L in chamber, S chamber
sBig t
0C, i.e. L
p=L
s+ t
0C.Its basic principle overlaps between the back time-delay of flashlight e and pump light f as shown in Figure 2, carries out the parameter effect first time in the chamber.P light and S light circulate a week in the chamber separately, the t of S light ratio P light elder generation
0Time arrives parameter crystal place, makes another time portion of flashlight g and pump light h overlap, and has carried out the parameter amplification.Be every one week of circulation of S light, will be than the leading t of P light
0Thereby, realized that P light cuts apart utilization.
Be cavity dumping pulse export technique at last, adopt the parameter of cavity dumping choice of technology the best to amplify number of times.Because the saturation effect in the parametric process, carry out repeatedly parameter effect after, the energy of flashlight just might be back in the pump light.Utilize the gain in the oscilloscope supervision chamber, when gain reaches maximum, change the signal polarization state of light, reflex to outside the chamber by the Brewster window by the clock switch signal controlling Pockers cell of setting.
Concrete enforcement is as follows:
Pumping source is Quanta-Ray PRO230 Nd:YAG Lasers in the present embodiment, output repetition rate 10Hz, pulsewidth 10ns, centre wavelength 1054nm, single pulse energy 350mJ; Seed light source is Compact Pro, Femtolasers GmbH, output repetition rate 75MHz, pulsewidth 10fs; Frequency-doubling crystal that is adopted and parameter crystal all are KDP, and concrete parameter is as follows: frequency-doubling crystal: I class phase matched, I class phase matched cutting θ=41.2 °, φ=3mm, l=4mm, parameter crystal: I class phase matched, θ=47.64 °, α=3 °.
1, stack strengthens in the pumping optical cavity.What YAG Q-switched laser 4 was exported is that pulsewidth is that 10ns, repetition rate are the light pulse of 10Hz, and the flashlight behind the stretcher broadening can be supported the parametric process more than 20 times in theory between 300-500ps.But because the existence of saturation effect can not have 20 times parameter effect.The girth in design chamber is a 5ns*c=1.5 rice, and the pump light of 10ns just has been compressed into 5ns in the chamber.As shown in Figure 1, pump light forms b through the pulse energy stack in the week preceding 2T in back in the chamber, and the interior superimposed pulses of a week back 3T forms c, and the superimposed pulses in the week back 4T becomes d again.The P luminous intensity increases about 2 times in the pumping optical cavity like this, and corresponding electric field strength increases by 4 times.
2, the pulse menu is with synchronously.Because 4 outputs of YAG Q-switched laser is that pulsewidth is that 10ns, repetition rate are the light pulse of 10Hz, and the repetition rate of femtosecond oscillator is 75MHz, so carry out effective parameter to flashlight amplifies, just must from the pulse of 75MHz, select 10Hz and carry out the parameter effect, and selected pulse of coming out must and pump light synchronous fully.This process is finished by a menu and synchro system.In Fig. 3, the seed optical pulse of titanium jewel femtosecond pulse laser I output does not have aberration stretcher 2 broadenings through homocentric diffraction and becomes 500ps, after beam splitting chip 5 beam splitting, a part is received by PIN pipe 3, I is the signal that the PIN pipe receives among Fig. 5, with this signal input digit pulse delay unit (SDG, Synchronization and Delay Generator) 6.The triggering signal II of the 10Hz of the Q-SW SYNC end output of YAG laser 4 is input time delay device 6 also, these two kinds of signals of telecommunication are by synchronous, the delayed action of the TTL circuit among the delayer SDG6, output electric pulse signal III, high pressure FET pulse modulation in this pulse signal drive-pulse generator 9 produces high electric field pulse, this high electric field pulse is applied on the Pockers cell (Pokel Cell) 7, make it become the optical shutter of opening with 10Hz, finally from the pulse train of 75MHz, select the light pulse IV of 10Hz.
3, the design in chamber.As shown in Figure 4, the flashlight pulsewidth from stretcher input S chamber is 500ps.Realize the OPA that regenerates, the light path of S light in the chamber must lack τ c, i.e. 15cm than the light path of P light in the chamber.It is 150cm that the stack amplification of pump light requires the P cavity perimeter, and its concrete structure is chosen as 65cm * 10cm.The structure in S chamber should be (65cm-7.5cm) * 10cm so, passes through the coupling in delayer 18 meticulous adjustings two chambeies again.The angle of regulating two annular chambers according to the non-colinear angle of parameter crystal is 3 degree.In the P chamber, insert frequency-doubling crystal 16, regulate 16 and make it reach maximum shg efficiency, regulate the speculum 11 and the coupling mirror 10 in P chamber then meticulously, make the strictness of P light in the chamber.The same S cavity reflection mirror 12 of regulating makes the flashlight strictness in the chamber.Insert on the KDP crystal 17 at the intersection point place of two light then.
4, the injection of signal pulse.As shown in Figure 4, signal pulse behind the broadening is coupled in the chamber by Brewster window 15, regulate the OUT-1 DELAY on the SDGII15 control panel, the time that control gate voltage is opened, synchronous by oscilloscope supervision feasible accent Q signal II and selected signal pulse IV.Because behind the menu, the optical rotation of flashlight has been crossed 90 degree, can in the chamber, circulate, thereby realize the pulse injection.
5, the output of flashlight.With the gain of oscilloscope supervisory signal light pulse in the chamber, regulate the OUT DELAY2 on the SDGII15 panel, control adds the time that high-pressure door is opened on second Pockers cell (Pokel Cell) 7.Behind Pockers cell 7, the flashlight polarization direction turns over 90 degree, reflexes to outside the chamber by Brewster window 15.
Claims (1)
1. chirp pulse regeneration amplification method for pump light enhanced light parameter, it is characterized in that structure that this method is utilized ring-like chamber carries out to former pump light that stack strengthens in the chamber, to strengthen the power density of pump light, the structure in described ring-like chamber is the pulsewidth τ according to pump light
0Determine the long L in chamber of pumping optical cavity, this chamber length makes the pump light required time τ=L/c＜τ of a week that circulates in pump cavity
0, c wherein is the light velocity; Utilize flashlight and the pump light optical path difference in chamber separately again, realize the recycling of pump light, to improve transformation efficiency, the realization of described optical path difference is: adopt two described ring-like chambeies, be pumping optical cavity and signal optical cavity, described ring-like cavity configuration makes circulate in a chamber week back and pump light of flashlight that a delay be arranged in time, utilizes this to postpone to realize that flashlight carries out the parameter amplification again with another part pump light; Adopt the parameter of cavity dumping choice of technology the best to amplify number of times at last, saturation effect in the control parametric process, wherein former pump light is carried out stack enhancing in the chamber, it is the structure of utilizing ring-like chamber, make the pump light pulse front edge and after prolong in the chamber and superpose, described cavity dumping technology is to gain when reaching maximum when signal pulse, change the signal polarization state of light, and reflex to outside the chamber by the Brewster window.
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