CN104617480A - Laser pulse energy stabilizing device and method - Google Patents
Laser pulse energy stabilizing device and method Download PDFInfo
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- CN104617480A CN104617480A CN201510076966.8A CN201510076966A CN104617480A CN 104617480 A CN104617480 A CN 104617480A CN 201510076966 A CN201510076966 A CN 201510076966A CN 104617480 A CN104617480 A CN 104617480A
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Abstract
The invention discloses a laser pulse energy stabilizing device and method and belongs to the technical field of lasers. The device is divided into a main optical path and a sampling optical path. The main optical path is provided with a Pockels cell electro-optical switch. The sampling optical path is provided with a photoconductive switch. The method includes the steps of first detecting laser pulse energy fluctuation and then quickly discharging driving voltage applied to both electrodes of the Pockels cell electro-optical switch through the photoconductive switch. The laser pulse energy stabilizing device and method achieves energy stability control of the same laser pulse through the laser pulse energy fluctuation, has a self-stabilizing characteristic and does not cause laser pulse time waveform distortion.
Description
Technical field
The present invention relates to laser technology field, in particular to a kind of pulsed laser energy stabilizing arrangement and energy stabilization method thereof.
Background technology
The laser pulse that high power pulsed laser system requirements seed light source system produces not only has stable energy, also will have the distribution of specific time waveform.The conventional method of stabilized lasers pulse energy measures pulsed laser energy and compares with target energy, according to controller or the driving power of the difference feedback adjusting light path upstream of test energy and target energy.This method can only correct next laser pulse according to the fluctuation of energy of current PRF, if next send out the fluctuating rule of laser pulse and yardstick and when the fluctuating rule of pre-test laser pulse and yardstick inconsistent time, stable effect will be given a discount and is even deteriorated.The non-pulsed laser energy stabilization technique with to send out time can only the mean value of stabilized lasers pulse energy, can not eliminate laser pulse send out and send out between energy random fluctuation.
The photoelectricity variable transmissivity apparatus that document disclosed in Guo little Dong " photoelectricity prebias laser pulse amplitude stabilizer performance study " (periodical: light laser and the particle beams, 1997) utilizes the general-purpose device Pockers cell electrooptical switching of laser technology field and polarizer to form pre-add dynamic bias voltage carrys out stable adjustable Q laser pulse amplitude.It utilizes Quick photoelectric sampling gate to obtain Laser pulse sampling signal, export one with the low voltage electric impulse of laser pulse amplitudes linear proportional, linear electric pulse high-voltage amplifier zooms into high electric field pulse and is loaded on Pockers cell electrooptical switching electrode again, the Linear Amplifer region of high voltage amplifier circuit is limited, affects energy hole precision.Laser pulse and high-voltage pulse synchronously arrive Pockers cell electrooptical switching, and the time variations of laser pulse can be converted into the time variations of high voltage driving pulses, and then change conversely and treat stable Laser pulse time waveform, thus cause time waveform to distort.
Summary of the invention
For above-mentioned problems of the prior art, the invention provides a kind of pulsed laser energy stabilizing arrangement and energy stabilization method thereof, these apparatus and method utilize the fluctuation of energy of laser pulse self, realize controlling the energy stabilization of same laser pulse, and the time waveform of laser pulse is not distorted.
For achieving the above object, the invention provides following technical scheme:
A kind of pulsed laser energy stabilizing arrangement, comprise main optical path and sampling light path, described main optical path comprises the seed light source set gradually, optic path delay device, Pockers cell electrooptical switching, described sampling light path comprises beam splitter, described beam splitter is arranged between described seed light source and optic path delay device, described Pockers cell electrooptical switching be execute in advance alive, described sampling light path also comprises light intensity adjustable attenuator, photoconductivity switching, the order that arranges of described sampling light path is followed successively by: beam splitter, light intensity adjustable attenuator, photoconductivity switching, the two ends of described photoconductivity switching are connected with the two poles of the earth of Pockers cell electrooptical switching respectively.
Further, described main optical path also comprises polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, polarizer three, and described main optical path sets gradually as optic path delay device, polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, Pockers cell electrooptical switching, polarizer three according to the laser emission path that seed light source produces.
Further, described main optical path also comprises polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, completely reflecting mirror, and described main optical path sets gradually as optic path delay device, polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, Pockers cell electrooptical switching, completely reflecting mirror according to the laser emission path that seed light source produces.
Utilize a laser energy stability method for pulsed laser energy stabilizing arrangement as above, comprise the following steps:
(1) described Pockers cell electrooptical switching applies voltage V in advance
0, at the electrode stored charge of Pockers cell electrooptical switching, then seed light source sends laser pulse, and the pulse duration is τ, is beamed into two bundles through described beam splitter, and a branch of is main laser, and laser energy is E
in, another bundle is sampling light, and main laser transmits along main optical path, and sampling light is along sampling optic path;
(2) the sampling light that step (1) obtains first is transferred to light intensity adjustable attenuator, after the adjustment of described light intensity adjustable attenuator, be transferred to photoconductivity switching, makes described photoconductivity switching resistance value be reduced to bright resistance R by resistance in the dark value
aS, be stored in the photoconductivity switching that the electric charge on described Pockers cell electrooptical switching reduced by resistance value and release, the magnitude of voltage at Pockers cell electrooptical switching two ends is by V
0be reduced to V
pC, i.e. the actual voltage value of Pockers cell electrooptical switching
wherein, C is the equivalent capacitance value of Pockers cell electrooptical switching;
(3) described sampling light pulse is through afterwards, and the resistance value of described photoconductivity switching returns to resistance in the dark value, and the electric charge be stored on described Pockers cell electrooptical switching is not released by photoconductivity switching, and the voltage constant of Pockers cell electrooptical switching is at V
pC;
(4) main laser that obtains of step (1) is after the delay at optic path delay device, again successively through polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, be transferred to Pockers cell electrooptical switching, described main laser arrives the pulse duration τ being greater than sampling light time of delay of Pockers cell electrooptical switching, now, the voltage of Pockers cell electrooptical switching is constant in V by period in laser pulse
pC, then main laser exports through polarizer three, and main laser energy is adjusted to E
out, i.e. E
out=TE
in, obtain the laser pulse of energy stabilization, wherein
Further, polarizer three is replaced with completely reflecting mirror in described step (4), main laser first time is after Pockers cell electrooptical switching, then through completely reflecting mirror reflection, second time arrives Pockers cell electrooptical switching, now, the voltage of Pockers cell electrooptical switching is still T, and main laser, after the transmission of Pockers cell electrooptical switching, continues to be transferred to 1/4 wave phase delayer, polarizer two, faraday's magnetic polarization apparatus, reflect through polarizer one and export, main laser energy is adjusted to E
out, i.e. E
out=TE
in, obtain the laser pulse of energy stabilization, wherein
it is the transmissivity that main laser passes twice through Pockers cell electrooptical switching.
Further, described Pockers cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, one way work, and 1/2 wave voltage is 7kV, applies voltage V in advance
0for 7kV, equivalent capacitance value C is 14pF, and described transmissivity T is 30%-70%.
Further, described Pockers cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, round trip work, and 1/4 wave voltage is 3.5kV, applies voltage V in advance
0for 3.5kV, equivalent capacitance value C is 14pF, and described transmissivity T is 30%-70%.
Further, described photoconductivity switching is GaAs photoconductive switch, and resistance in the dark value is the megohm order of magnitude, and bright resistance is ohmage magnitude.
Further, the energy of described main laser is 10:1 with the energy ratio of sampling light.
Beneficial effect of the present invention is as follows:
1, the present invention adopts photoconductivity switching in sampling light path, utilize the bright change in resistance of photoconductivity switching to release rapidly the electric charge of Pockers cell electrooptical switching electrode to control transmissivity, this control method fast response time, adjust the fluctuation of energy of laser pulse more accurately;
2, the resistance in the dark value of photoconductivity switching is very high, electric charge of can not releasing, thus makes Pockers cell electrooptical switching by the voltages keep constant after regulating and controlling, thus laser pulse shape can not be caused to distort;
3, by main laser is postponed, the transmissivity of Pockers cell electrooptical switching is regulated with the sampling light of same laser pulse, utilize the energy stabilization of the fluctuation of energy of laser pulse self realization to same laser pulse, thus realize all accurately controlling each laser pulse, greatly reduce laser pulse send out and send out between fluctuation of energy, and ensure laser pulse shape can not be caused to distort;
4, main laser is passed twice through Pockers cell electrooptical switching, reduce the operating voltage of Pockers cell electrooptical switching, be conducive to the stable of pulsed laser energy.
Accompanying drawing explanation
Fig. 1 is overall structure and the light path schematic diagram of the embodiment of the present invention one;
Fig. 2 is overall structure and the light path schematic diagram of the embodiment of the present invention two;
Fig. 3 is circuit diagram of the present invention;
Fig. 4 is the laser energy fluctuation pattern before and after the embodiment of the present invention two is stable;
Fig. 5 is the timing chart before and after the embodiment of the present invention two is stable.
In figure: 1-seed light source, 2-beam splitter, 3-polarizer one, 4-faraday magnetic polarization apparatus, 5-polarizer two, 6-1/4 wave phase delayer, 7-Pockers cell electrooptical switching, 8-completely reflecting mirror, 9-light intensity adjustable attenuator, 10-polarizer three, 11-photoconductivity switching, 12-optic path delay device.
Embodiment
Technical scheme of the present invention is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present invention; clear, complete description is carried out to technical scheme of the present invention; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As shown in Figure 1, a kind of pulsed laser energy stabilizing arrangement, comprise main optical path and sampling light path, described main optical path comprises the seed light source 1 set gradually, optic path delay device 12, polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, Pockers cell electrooptical switching 7, polarizer 3 10, the laser that described seed light source 1 produces at the transmission path of main optical path is: optic path delay device 12, polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, Pockers cell electrooptical switching 7, polarizer 3 10, described Pockers cell electrooptical switching 7 is potassium dideuterium phosphate electrooptical switching, one way works, 1/2 wave voltage is 7kV, equivalent capacitance value C is 14pF, the voltage V applied in advance
0for 7kV.
As shown in Figure 1, described sampling light path comprises the beam splitter 2, light intensity adjustable attenuator 9, the photoconductivity switching 11 that set gradually, described beam splitter 2 is arranged between described seed light source 1 and optic path delay device 12, the laser sent by seed light source 1 at the transmission path of sampling light path is: beam splitter 2, light intensity adjustable attenuator 9, photoconductivity switching 11, the two ends of described photoconductivity switching 11 are connected with the two poles of the earth of Pockers cell electrooptical switching 7 respectively.In sampling light path, adopt photoconductivity switching 11, utilize the bright change in resistance of photoconductivity switching 11 to release rapidly the electric charge of Pockers cell electrooptical switching 7 electrode to control transmissivity, this control method fast response time, adjust the fluctuation of energy of laser pulse more accurately.
Utilize a laser energy stability method for pulsed laser energy stabilizing arrangement as above, comprise the following steps:
(1) described Pockers cell electrooptical switching 7 applies voltage V in advance
0, V
0for 7kV, at the electrode stored charge of Pockers cell electrooptical switching 7, then seed light source 1 sends laser pulse, and the pulse duration is τ, is beamed into two bundles through described beam splitter 2, and a branch of is main laser, and laser energy is E
in, another bundle is sampling light, and the energy of described main laser is 10:1 with the energy ratio of sampling light, and main laser transmits along main optical path, and sampling light is along sampling optic path;
(2) the sampling light that step (1) obtains first is transferred to light intensity adjustable attenuator 9, after described light intensity adjustable attenuator 9 regulates, sampling polarization degree improves, luminous intensity obtains the change of corresponding proportion, then be transferred to photoconductivity switching 11 and absorbed, making described photoconductivity switching 11 resistance value be reduced to bright resistance R by resistance in the dark value
aSgaAs photoconductive switch selected by described photoconductivity switching 7, its resistance in the dark value is megohm magnitude, bright resistance is ohm level, and its bright resistance is inversely proportional to the energy of sampling light, after the resistance of photoconductivity switching 11 is reduced to bright resistance, as shown in Figure 3, photoconductivity switching 11 and Pockers cell electrooptical switching 7 form RC closed-loop path, be stored in the photoconductivity switching 11 that the electric charge on described Pockers cell electrooptical switching 7 reduced by resistance value to release rapidly, the magnitude of voltage at Pockers cell electrooptical switching 7 two ends is by V
0be reduced to V
pC, namely the actual voltage value of Pockers cell electrooptical switching 7 is
v
pCfor 2.5-4.5kV, V
pCcentral value be 3.5kV, wherein, C is the equivalent capacitance value of Pockers cell electrooptical switching 7, and τ is laser pulse duration;
(3) described sampling light pulse is through afterwards, the resistance value of described photoconductivity switching 11 returns to resistance in the dark value, be equivalent to RC loop disconnect, the electric charge be stored on described Pockers cell electrooptical switching 7 is not released by photoconductivity switching 11, and the voltage constant of Pockers cell electrooptical switching 7 is at V
pC, because the resistance in the dark value of photoconductivity switching 11 is very high, electric charge of can not releasing, thus make Pockers cell electrooptical switching 7 by the voltages keep constant after regulating and controlling, thus laser pulse shape can not be caused to distort;
(4) main laser that obtains of step (1) is after the delay at optic path delay device 12, again successively through polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, the effect of described 1/4 wave phase delayer 6 is the polarization states changing laser, be convenient to regulation of energy, described polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25 combination arranges and main laser can be separated from light path, avoid the impact of reflection glare, unwanted impurity light is then exported by polarizer 25, main laser is transferred to Pockers cell electrooptical switching 7, described main laser arrives the pulse duration τ being greater than sampling light time of delay of Pockers cell electrooptical switching 7, now, the voltage of Pockers cell electrooptical switching 7 is constant in V by period in laser pulse
pC, main laser exports through Pockers cell electrooptical switching 7 and polarizer 3 10, and main laser energy is adjusted to E
out, i.e. E
out=TE
in, wherein
be the transmissivity that main laser is combined by Pockers cell electrooptical switching 7 and polarizer 3 10, T is the central value of 30%-70%, T is 50%, obtains the laser pulse of energy stabilization.By main laser is postponed, the transmissivity of Pockers cell electrooptical switching 7 is regulated with the sampling light of same laser pulse, utilize the energy stabilization of the fluctuation of energy of laser pulse self realization to same laser pulse, thus realize all accurately controlling each laser pulse, greatly reduce laser pulse send out and send out between fluctuation of energy, and ensure laser pulse shape can not be caused to distort.
Embodiment two:
As shown in Figure 2, a kind of pulsed laser energy stabilizing arrangement, comprise main optical path and sampling light path, described main optical path comprises the seed light source 1 set gradually, optic path delay device 12, polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, Pockers cell electrooptical switching 7, completely reflecting mirror 8, the laser that described seed light source 1 produces at the transmission path of main optical path is: optic path delay device 12, polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, Pockers cell electrooptical switching 7, completely reflecting mirror 8, Pockers cell electrooptical switching 7, 1/4 wave phase delayer 6, polarizer 25, faraday's magnetic polarization apparatus 4, polarizer 1, described Pockers cell electrooptical switching 7 is potassium dideuterium phosphate electrooptical switching, round trip works, 1/4 wave voltage is 3.5kV, apply voltage V in advance
0, equivalent capacitance value C is 14pF.Main laser is passed twice through Pockers cell electrooptical switching 7, reduce the operating voltage of Pockers cell electrooptical switching 7, be conducive to the stable of pulsed laser energy.
Sampling light path is with embodiment one.
Utilize a laser energy stability method for pulsed laser energy stabilizing arrangement as above, comprise the following steps:
(1) described Pockers cell electrooptical switching 7 applies voltage V in advance
0, be 3.5kV, at the electrode stored charge of Pockers cell electrooptical switching 7, then seed light source 1 sends laser pulse, and the pulse duration is τ, is beamed into two bundles through described beam splitter 2, and a branch of is main laser, and laser energy is E
in, another bundle is sampling light, and the energy of described main laser is 10:1 with the energy ratio of sampling light, and main laser transmits along main optical path, and sampling light is along sampling optic path;
(2) the sampling light that step (1) obtains first is transferred to light intensity adjustable attenuator 9, after described light intensity adjustable attenuator 9 regulates, luminous intensity is changed accordingly, then be transferred to photoconductivity switching 11 and absorbed, making described photoconductivity switching 11 resistance value be reduced to bright resistance R by resistance in the dark value
aSgaAs photoconductive switch selected by described photoconductivity switching 7, its resistance in the dark value is megohm magnitude, bright resistance is ohm level, and its bright resistance is inversely proportional to, after the resistance of photoconductivity switching 11 is reduced to bright resistance with the energy of sampling light, as shown in Figure 3, photoconductivity switching 11 and Pockers cell electrooptical switching 7 form RC closed-loop path, and be stored in the photoconductivity switching 11 that the electric charge on described Pockers cell electrooptical switching 7 reduced by resistance value and release, the magnitude of voltage at Pockers cell electrooptical switching 7 two ends is by V
0be reduced to V
pC, namely the actual voltage value of Pockers cell electrooptical switching 7 is
v
pCfor 1.2-2.3kV, V
pCcentral value be 1.75kV, wherein, C is the equivalent capacitance value of Pockers cell electrooptical switching 7;
(3) described sampling light pulse is through afterwards, the resistance value of described photoconductivity switching 11 returns to resistance in the dark value, be equivalent to RC loop disconnect, the electric charge be stored on described Pockers cell electrooptical switching 7 is not released by photoconductivity switching 11, and the voltage constant of Pockers cell electrooptical switching 7 is at V
pC, because the resistance in the dark value of photoconductivity switching 11 is very high, electric charge of can not releasing, thus make Pockers cell electrooptical switching 7 by the voltages keep constant after regulating and controlling, thus laser pulse shape can not be caused to distort;
(4) main laser that obtains of step (1) is after the delay at optic path delay device 12, again successively through polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25, 1/4 wave phase delayer 6, the effect of described 1/4 wave phase delayer 6 is the polarization states changing laser, be convenient to regulation of energy, described polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25 combination arranges and main laser can be separated from light path, avoid the impact of reflection glare, main laser is transferred to Pockers cell electrooptical switching 7, described main laser arrives the pulse duration τ being greater than sampling light time of delay of Pockers cell electrooptical switching 7, now, the voltage of Pockers cell electrooptical switching 7 is constant in V by period in laser pulse
pC, main laser after Pockers cell electrooptical switching 7, then reflects through completely reflecting mirror 8, and second time arrives Pockers cell electrooptical switching 7, and now, the voltage of Pockers cell electrooptical switching 7 is still V
pCmain laser, after the transmission of Pockers cell electrooptical switching 7, continues to be transferred to 1/4 wave phase delayer 6, polarizer 25, faraday's magnetic polarization apparatus 4, reflects export through polarizer 1, then exported by polarizer 25 for unwanted impurity light, main laser energy is adjusted to E
out, i.e. E
out=TE
in, wherein
be main laser twice through the round trip transmissivity of Pockers cell electrooptical switching 7 with polarizer 25, T is the central value of 30%-70%, T is 50%, obtains the laser pulse of energy stabilization.By main laser is postponed, the transmissivity of Pockers cell electrooptical switching 7 is regulated with the sampling light of same laser pulse, utilize the energy stabilization of the fluctuation of energy of laser pulse self realization to same laser pulse, thus realize all accurately controlling each laser pulse, greatly reduce laser pulse send out and send out between fluctuation of energy, and ensure laser pulse shape can not be caused to distort.
During specific works, when this pulse energy does not does not rise and fall, sampling light makes the dynamic light resistance of photoconductivity switching 11 become central value, correspondingly makes the virtual voltage V of Pockers cell electrooptical switching 7
pCbe reduced to central value 1.75kV, twice through the Pockers cell electrooptical switching 7 round trip transmissivity T=50% with polarizer 25, thus the main laser energy that main optical path is exported is E
out, i.e. 0.5E
in; When this pulsed laser energy is higher, the energy of main laser and sampling light all can be higher, sampling light makes the dynamic electric resistor of photoconductivity switching 11 become to be slightly smaller than central value, correspondingly to make the more of the charge discharging resisting at Pockers cell electrooptical switching 7 two ends, the virtual voltage V of Pockers cell electrooptical switching 7
pClower than central value 1.75kV, round trip transmissivity T < 50%, thus the main laser energy that main optical path is exported is reduced to E
out; When this pulsed laser energy is on the low side, the energy of main laser and sampling light all can be on the low side, sampling light makes the dynamic electric resistor of photoconductivity switching 11 be a bit larger tham central value, correspondingly makes the charge discharging resisting at Pockers cell electrooptical switching 7 two ends reduce, the virtual voltage V of Pockers cell electrooptical switching 7
pChigher than central value 1.75kV, round trip transmissivity T > 50%, thus the main laser energy that main optical path is exported is increased to E
out, thus realize laser energy stability.Because the main laser at main optical path is by period, Pockers cell electrooptical switching 7 residual voltage is constant, and transmissivity T does not change in time, and Laser pulse time therefore can not be caused to distort.Main laser is passed twice through Pockers cell electrooptical switching 7, reduce the operating voltage of Pockers cell electrooptical switching 7, be conducive to the stable of pulsed laser energy.
Utilize device and the laser energy stability method of the present embodiment, 85 pulse durations sent seed light source are that the step laser pulse of 8ns carries out regulation of energy, main optical path main laser postpone time be 10ns, from calculating, the central value of the bright resistance of photoconductivity switching is 824 Ω, realizing energy stabilization by regulating light intensity adjustable attenuator 9 to control, detecting the input laser energy E of each pulse
inwith Output of laser ENERGY E
outresult as shown in Figure 4, as can be seen from Figure, (input) laser that seed light source sends send out and send out between pulse energy rise and fall very large, PV value (peak-to-valley value) reaches 39%, laser pulse after the apparatus and method of the present embodiment are stablized is sent out and is reduced to 5%, RMS value (root-mean-square value) and is reduced to 1.1% with the fluctuation of energy sent out by 10.5%, significantly reduce laser pulse send out and between fluctuation of energy.
Fig. 5 is input waveform and the output waveform of appointing 1 laser pulse got in above-mentioned 85 step laser pulses, as can be seen from Figure, after the apparatus and method of the present embodiment are stable, output waveform and input waveform completely the same, do not cause the distortion of waveform.
The laser pulse duration that the present invention is suitable for is not limited in 8ns, is also applicable to duration shorter or longer laser pulse, the short pulse of such as below 100fs or the long pulse of more than 10ns; The laser pulse shape that the present invention is suitable for is not limited in step-like pulse, is also applicable to the pulse of any other waveform, such as the pulse of any reshaping such as Gaussian pulse, square-wave pulse.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (9)
1. a pulsed laser energy stabilizing arrangement, comprise main optical path and sampling light path, described main optical path comprises the seed light source set gradually, optic path delay device, Pockers cell electrooptical switching, described sampling light path comprises beam splitter, described beam splitter is arranged between described seed light source and optic path delay device, it is characterized in that, described Pockers cell electrooptical switching be execute in advance alive, described sampling light path also comprises light intensity adjustable attenuator, photoconductivity switching, the order that arranges of described sampling light path is followed successively by: beam splitter, light intensity adjustable attenuator, photoconductivity switching, the two ends of described photoconductivity switching are connected with the two poles of the earth of Pockers cell electrooptical switching respectively.
2. a kind of pulsed laser energy stabilizing arrangement according to claim 1, it is characterized in that, described main optical path also comprises polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, polarizer three, and described main optical path sets gradually as optic path delay device, polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, Pockers cell electrooptical switching, polarizer three according to the laser emission path that seed light source produces.
3. a kind of pulsed laser energy stabilizing arrangement according to claim 1, it is characterized in that, described main optical path also comprises polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, completely reflecting mirror, and described main optical path sets gradually as optic path delay device, polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, Pockers cell electrooptical switching, completely reflecting mirror according to the laser emission path that seed light source produces.
4. utilize as arbitrary in claim 1-3 as described in the laser energy stability method of pulsed laser energy stabilizing arrangement, it is characterized in that, comprise the following steps:
(1) described Pockers cell electrooptical switching applies voltage V in advance
0, at one end stored charge of Pockers cell electrooptical switching, then seed light source sends laser pulse, and the pulse duration is τ, is beamed into two bundles through described beam splitter, and a branch of is main laser, and laser energy is E
in, another bundle is sampling light, and main laser transmits along main optical path, and sampling light is along sampling optic path;
(2) the sampling light that step (1) obtains first is transferred to light intensity adjustable attenuator, after the adjustment of described light intensity adjustable attenuator, be transferred to photoconductivity switching, makes described photoconductivity switching resistance value be reduced to bright resistance R by resistance in the dark value
aS, be stored in the photoconductivity switching that the electric charge on described Pockers cell electrooptical switching reduced by resistance value and release, the magnitude of voltage at Pockers cell electrooptical switching two ends is by V
0be reduced to V
pC, i.e. the actual voltage value of Pockers cell electrooptical switching
wherein, C is the equivalent capacitance value of Pockers cell electrooptical switching;
(3) described sampling light pulse is through afterwards, and the resistance value of described photoconductivity switching returns to resistance in the dark value, and the electric charge be stored on described Pockers cell electrooptical switching is not released by photoconductivity switching, and the voltage constant of Pockers cell electrooptical switching is at V
pC;
(4) main laser that obtains of step (1) is after the delay at optic path delay device, again successively through polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, be transferred to Pockers cell electrooptical switching, described main laser arrives the pulse duration τ being greater than sampling light time of delay of Pockers cell electrooptical switching, now, the voltage of Pockers cell electrooptical switching is constant in V by period in laser pulse
pC, then main laser exports through polarizer three, and main laser energy is adjusted to E
out, i.e. E
out=TE
in, obtain the laser pulse of energy stabilization, wherein
5. a kind of laser energy stability method according to claim 4, it is characterized in that, polarizer three is replaced with completely reflecting mirror in described step (4), main laser first time is after Pockers cell electrooptical switching, reflect through completely reflecting mirror again, second time arrives Pockers cell electrooptical switching, and now, the voltage of Pockers cell electrooptical switching is still V
pC, main laser, after the transmission of Pockers cell electrooptical switching, continues to be transferred to 1/4 wave phase delayer, polarizer two, faraday's magnetic polarization apparatus, and reflect through polarizer one and export, main laser energy is adjusted to E
out, i.e. E
out=TE
in, obtain the laser pulse of energy stabilization, wherein
it is the transmissivity that main laser passes twice through Pockers cell electrooptical switching.
6. a kind of laser energy stability method according to claim 4, is characterized in that, described Pockers cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, one way work, and 1/2 wave voltage is 7kV, applies voltage V in advance
0for 7kV, equivalent capacitance value C is 14pF, and described transmissivity T is 30%-70%.
7. a kind of laser energy stability method according to claim 5, is characterized in that, described Pockers cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, round trip work, and 1/4 wave voltage is 3.5kV, applies voltage V in advance
0for 3.5kV, equivalent capacitance value C is 14pF, and described transmissivity T is 30%-70%.
8. a kind of laser energy stability method according to claim 5, is characterized in that, described photoconductivity switching is GaAs photoconductive switch, and resistance in the dark value is the megohm order of magnitude, and bright resistance is ohmage magnitude.
9. a kind of laser energy stability method according to claim 4, is characterized in that, the energy of described main laser is 10:1 with the energy ratio of sampling light.
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| CN117673882A (en) * | 2024-01-31 | 2024-03-08 | 北京中科思远光电科技有限公司 | Device for improving stability of amplified laser system and control method |
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