CN104617479B - A kind of laser energy stability device and its energy stabilization method based on prefix pulse - Google Patents
A kind of laser energy stability device and its energy stabilization method based on prefix pulse Download PDFInfo
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- CN104617479B CN104617479B CN201510076780.2A CN201510076780A CN104617479B CN 104617479 B CN104617479 B CN 104617479B CN 201510076780 A CN201510076780 A CN 201510076780A CN 104617479 B CN104617479 B CN 104617479B
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Abstract
The invention discloses a kind of laser energy stability device and its energy stabilization method based on prefix pulse,Belong to laser technology field,Including main optical path and sampling light path,The main optical path includes seed light source,Pockers cell electrooptical switching,Speculum,Slicing switchs,The sampling light path includes light intensity adjustable attenuator,Coupler,Photoconductivity switching,The two poles of the earth of the both ends of the photoconductivity switching respectively with Pockers cell electrooptical switching are connected,The present invention is combined using Pockers cell electrooptical switching with photoconductivity switching,Apply voltage on Pockers cell electrooptical switching in advance,A prefix pulse is first produced before laser pulse,Go to change the dynamic resistance of photoconductivity switching using the fluctuation of energy of prefix pulse,So as to change the transmissivity of the virtual voltage at Pockers cell electrooptical switching both ends and Pockers cell electrooptical switching,Realize and the energy stabilization of laser pulse is controlled,With with the stable feature of hair,And the time waveform of laser pulse is set not to be distorted.
Description
Technical field
The present invention relates to laser technology field, in particular to a kind of laser energy stability device based on prefix pulse
And its energy stabilization method.
Background technology
The pumping pulse width of usual pulsed laser system is in musec order, and the width of laser pulse is measured in nanosecond
Level, or it is shorter.Therefore, in a pumping process, exaggerated laser pulse (main pulse) is with being located at its preceding few tens of nano-seconds
The pulse (prefix pulse) at place has the unstable feature of identical, can be considered same hair laser.
The conventional method of stabilized lasers pulse energy is to measure pulsed laser energy and compared with target energy, according to test
The controller or driving power of the difference feedback adjustment light path upstream of energy and target energy.This method can only be according to current arteries and veins
The fluctuation of energy of punching corrects next hair laser pulse, if the fluctuating rule of next hair laser pulse and yardstick swash with current measurement
When the fluctuating rule and inconsistent yardstick of light pulse, stable effect will give a discount or even be deteriorated.The non-laser arteries and veins with hair time
Rush energy stabilization technology can only stabilized lasers pulse energy average value, it is impossible to eliminate laser pulse hair hair between energy with
Machine rises and falls.
Document disclosed in Guo little Dong " photoelectricity prebias laser pulse amplitude stabilizer performance study " (periodical：Light laser and particle
Beam, 1997) utilize general-purpose device Pockers cell electrooptical switching and the polarizer composition pre-add dynamic bias of laser technology field
The photoelectricity variable transmissivity apparatus of voltage stablizes adjustable Q laser pulse amplitude.It obtains laser arteries and veins using Quick photoelectric sampling gate
Sampled signal is rushed, exports a low voltage electric impulse with laser pulse amplitudes linear proportional, then linear electric pulse height presses
Big device zooms into high electric field pulse and is loaded on Pockers cell electrooptical switching electrode, and the Linear Amplifer region of high voltage amplifier circuit has
Limit, influences energy hole precision.Laser pulse synchronously arrives at Pockers cell electrooptical switching, the time of laser pulse with high-voltage pulse
Change can be converted into the time change of high voltage driving pulses, and then change Laser pulse time waveform to be stablized in turn, from
And time waveform is caused to distort.
The content of the invention
For above-mentioned problems of the prior art, the present invention provides a kind of laser energy stability based on prefix pulse
Device and its energy stabilization method, the apparatus and method realize the energy to laser pulse using the fluctuation of energy of prefix pulse
Stability contorting, have with the stable feature of hair, and the time waveform of laser pulse is not distorted.
To achieve the above object, the present invention provides following technical scheme：
A kind of laser energy stability device based on prefix pulse, including main optical path and sampling light path, the main optical path bag
The seed light source set gradually, Pockers cell electrooptical switching, speculum are included, the Pockers cell electrooptical switching is to be previously applied electricity
Pressure, the main optical path also includes slicing and switched, and the laser emission path that the main optical path is sent according to seed light source is set successively
It is set to：Pockers cell electrooptical switching, speculum, slicing switch, the sampling light path include the light intensity adjustable damping set gradually
Device, coupler, photoconductivity switching, the light intensity adjustable attenuator are relative with Pockers cell electrooptical switching located at the speculum
Side, the coupler is connected with the photoconductivity switching by optical fiber, the both ends of the photoconductivity switching respectively with general gram
You are connected at the two poles of the earth of box electrooptical switching.
Further, the main optical path also includes polarizer one, faraday's magnetic polarization apparatus, polarizer two, the delay of 1/4 wave phase
Device, the laser emission path that the main optical path is sent according to seed light source set gradually for：Polarizer one, faraday's magnetic rotation
Device, polarizer two, 1/4 wave phase delayer, Pockers cell electrooptical switching, speculum, Pockers cell electrooptical switching, 1/4 ripple phase
Position delayer, polarizer two, faraday's magnetic polarization apparatus, polarizer one, slicing switch.
Further, the speculum is coated with reflectance coating, and light leak rate is 10%.
In addition, the present invention also provides a kind of laser using the laser energy stability device based on prefix pulse as described above
Energy stabilization method, comprises the following steps：
(1) the Pockers cell electrooptical switching is previously applied voltage V0, electricity is stored in the electrode of Pockers cell electrooptical switching
Lotus, then seed light source first send prefix pulse before main pulse is sent, duration of the prefix pulse is t, the master
The duration of pulse is t1, the time interval of the prefix pulse and main pulse is t2, meet t1＜ t2, prefix pulse and master
Pulse is transmitted along main optical path, obtains the prefix pulse of main laser and the main pulse of main laser, and main pulse laser energy is Ein；
(2) after the prefix pulse for the main laser that step (1) obtains is transferred to speculum, through speculum prefix pulse into
To sample the prefix pulse of light, the prefix pulse for main laser of main optical path, the prefix pulse edge of the main laser are reflected back toward
After polarizer one is transported in main optical path second pass, pruned by slicing switch, the prefix pulse of the sampling light can by light intensity
After the regulation of controlled attenuator and the coupling of coupler, photoconductivity switching is transferred to by optical fiber, makes the photoconductivity switching resistance
Value is reduced to bright resistance value R by resistance in the dark valueAS, light that the electric charge that is stored on the Pockers cell electrooptical switching is reduced by resistance value
Conductance switch is released, and the voltage at Pockers cell electrooptical switching both ends is by V0It is reduced to VPC, i.e. the reality of Pockers cell electrooptical switching
Magnitude of voltageWherein, C is the equivalent capacitance value of Pockers cell electrooptical switching, and t is holding for prefix pulse
The continuous time.
(3) the prefix pulse due to main laser and main pulse existence time interval t2, therefore in this time interval, institute
Photoconductivity switching can not be passed through by stating the electric charge that the resistance value of photoconductivity switching is recovered to resistance in the dark value, to be stored on the Pockers cell
Release, the voltage constant of Pockers cell electrooptical switching is in VPC；
(4) main pulse of main laser is prolonged by polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase successively
Slow device, be transferred to Pockers cell electrooptical switching, now, the voltage of Pockers cell electrooptical switching main pulse by period it is constant
VPC, main pulse is transferred to speculum after Pockers cell electrooptical switching, and the main pulse through speculum turns into the master of sampling light
Pulse, the main pulse for main laser of main optical path is reflected back toward, now, the main pulse laser energy of main laser is 0.9Ein, it is described
Between the main pulse of prefix pulse and sampling light of the main pulse of main laser in sampling light in sequential relationship, the main laser
Main pulse second by Pockers cell electrooptical switching, now, the main pulse for sampling light is not yet transferred to photoconductivity switching, general
The voltage of kerr cell electrooptical switching is constant in V by period in the main pulse of main laserPC, the main pulse of main laser afterwards passes successively
It is defeated to be exported to 1/4 wave phase delayer, polarizer two, faraday's magnetic polarization apparatus, polarizer one, slicing switch, the master of main laser
Pulse energy is adjusted to Eout, i.e. Eout=0.9TEin, the laser pulse of energy stabilization is obtained, whereinIt is the transmissivity that main laser passes twice through Pockers cell electrooptical switching.
Further, the length of light path optical fiber is sampled by changing, the main pulse of the main laser is located in sequential relationship
Between the prefix pulse of sampling light and the main pulse of sampling light.
Further, the Pockers cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, and round trip works, and 1/4 wave voltage is
3.5kV, equivalent capacitance value C are 10pF.
Further, the Pockers cell electrooptical switching is previously applied voltage V0For 3.5kV, the Pockers cell electrooptical switching
Transmissivity T be 30-70%.
Further, the photoconductivity switching is GaAs photoconductive switch, and resistance in the dark value is megohm order of magnitude, and bright resistance value is
Ohm order of magnitude.
Beneficial effects of the present invention are as follows：
1st, the present invention uses photoconductivity switching in light path is sampled, and is released rapidly using the bright resistance value changes of photoconductivity switching
The electric charge of Pockers cell electrooptical switching electrode controls transmissivity, the control method fast response time, more accurate adjustment laser
The fluctuation of energy of pulse；
2nd, photoconductive resistance in the dark value is very high, and will not release electric charge, so that after Pockers cell electrooptical switching is adjusted
Voltages keep constant, so as to laser pulse shape be caused to distort.
3rd, the prefix pulse that can be considered with main pulse with hair is sent by seed light source, prefix pulse passes through photoconductivity switching
The transmissivity of Pockers cell electrooptical switching is adjusted, the accurate control to same hair pulsed laser energy is realized, greatly reduces sharp
The fluctuation of energy between hair is sent out in light pulse, while does not cause the distortion of laser pulse shape；
4th, main laser is passed twice through into Pockers cell electrooptical switching, reduces the operating voltage of Pockers cell electrooptical switching,
Be advantageous to the stabilization of pulsed laser energy；
5th, without postponing main pulse by space optical path, the volume of device is substantially reduced.
Brief description of the drawings
Fig. 1 is the overall structure and light path schematic diagram of the present invention；
Fig. 2 is the prefix pulse and main pulse sequential relationship and the signal of Pockers cell electrooptical switching voltage change of the present invention
Figure；
Fig. 3 is circuit diagram of the present invention；
Fig. 4 is through the stable front and rear laser energy fluctuation pattern of the embodiment of the present invention one；
Fig. 5 is through the stable front and rear timing chart of the embodiment of the present invention one.
In figure：1-seed light source, 2-coupler, 3-polarizer one, 4-faraday magnetic polarization apparatus, 5-polarizer two,
6-1/4 wave phase delayer, 7-Pockers cell electrooptical switching, 8-speculum, 9-light intensity adjustable attenuator, 10-optical fiber,
11-photoconductivity switching, 12-slicing switch.
Embodiment
In order that those skilled in the art more fully understand technical scheme, it is right with reference to the accompanying drawing of the present invention
Technical scheme carries out clear, complete description, and based on the embodiment in the application, those of ordinary skill in the art exist
The other similar embodiments obtained on the premise of not making creative work, it should all belong to the scope of the application protection.
Embodiment one：
As shown in figure 1, a kind of laser energy stability device based on prefix pulse, including main optical path and sampling light path, institute
Stating main optical path includes what is set gradually：Seed light source 1, polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25,1/4 ripple phase
Position delayer 6, Pockers cell electrooptical switching 7, speculum 8, slicing switch 12.The laser sent by seed light source 1 is in main optical path
Transmission path be：Polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25,1/4 wave phase delayer 6, Pockers cell electricity
Photoswitch 7, speculum 8, Pockers cell electrooptical switching 7,1/4 wave phase delayer 6, polarizer 25, faraday's magnetic polarization apparatus 4,
Polarizer 1, slicing switch 12, the Pockers cell electrooptical switching 7 are potassium dideuterium phosphate electrooptical switching, and round trip works, 1/4 ripple
Voltage is 3.5kV, and equivalent capacitance value C is 10pF, and it is V to be previously applied voltage0, the slicing switch 12 is also potassium dideuterium phosphate electricity
Photoswitch, one way work, 1/2 wave voltage is 7kV, and when needing slicing, 1/2 wave voltage is previously applied on slicing switch 12,
Now the transmissivity of laser pulse is 0, reaches the purpose of slicing, and after the completion of slicing, slicing of decorporating switchs the voltage at 12 both ends i.e.
Can.Without postponing main pulse by space optical path, the volume of device is substantially reduced.
As shown in figure 1, light intensity adjustable attenuator 9, coupler 2, photoconduction that the sampling light path includes setting gradually are opened
11 are closed, the light intensity adjustable attenuator 9 is located at the side relative with Pockers cell electrooptical switching 7 of the speculum 8, the coupling
Clutch 2 is connected with photoconductivity switching 11 by optical fiber 10, by changing the length of optical fiber 10, can postpone to sample light arrival photoelectricity
Lead the time of switch 11, the two poles of the earth of the both ends of the photoconductivity switching 11 respectively with Pockers cell electrooptical switching 7 pass through wire phase
Connection.Photoconductivity switching 11 is used in light path is sampled, is released rapidly Pu Keer using the bright resistance value changes of photoconductivity switching 11
The electric charge of the electrode of box electrooptical switching 7 controls transmissivity, the control method fast response time, more accurate adjustment laser pulse
Fluctuation of energy.
As shown in Fig. 2 main laser and the sequential relationship of sampling light and the electricity of Pockers cell electrooptical switching 7 in said apparatus
Buckling, by changing the length of sampling light path optical fiber 10, make sampling light delay time t3, the main pulse of the main laser is existed
In sequential relationship between the prefix pulse for sampling light and the main pulse of sampling light.
In addition, the present invention also provides a kind of laser using the laser energy stability device based on prefix pulse as described above
Energy stabilization method, comprises the following steps：
(1) the Pockers cell electrooptical switching 7 is previously applied voltage V0, it is 3.5kV, in Pockers cell electrooptical switching 7
Electrode stores electric charge, and then seed light source 1 first sends prefix pulse, the duration of the prefix pulse before main pulse is sent
For t, the duration of the main pulse is t1, the time interval of the prefix pulse and main pulse is t2, meet t1＜ t2, it is preceding
Sew pulse and main pulse is transmitted along main optical path, obtain the prefix pulse of main laser and the main pulse of main laser, main pulse laser
Energy is Ein；
(2) the prefix pulse for the main laser that step (1) obtains is transferred to Pockers cell electrooptical switching for the first time along main optical path
7, now, the virtual voltage at the both ends of Pockers cell electrooptical switching 7 is still V0, transmissivity is 100% (relative value), so main laser
Prefix pulse all transmission after be transferred to speculum 8, due to be coated with speculum 8 light leak rate be 10% reflectance coating, therefore
The prefix pulse for having 10% passes through speculum 8, and 90% prefix pulse is reflected back toward main optical path, through the prefix arteries and veins of speculum 8
It is washed into sample the prefix pulse of light, is reflected back toward the prefix pulse for main laser of main optical path, the prefix arteries and veins of the main laser
Punching is transferred to Pockers cell electrooptical switching 7,1/4 wave phase delayer 6, polarizer 25, faraday's magnetic rotation along main optical path successively
Device 4, polarizer 1, pruned finally by slicing switch 12, light intensity adjustable attenuator 9 is passed through in the prefix pulse of the sampling light
Regulation and coupler 2 coupling after, photoconductivity switching 11 is then transferred to by optical fiber 10, makes the electricity of the photoconductivity switching 11
Resistance is reduced to bright resistance value R by resistance in the dark valueAS, the selection of the photoconductivity switching 7 gallium arsenide photoelectric guiding element, its resistance in the dark value is megaohm
Nurse magnitude, bright resistance value is ohm order of magnitude, and its bright resistance value is inversely proportional with sampling the energy of light, when the resistance of photoconductivity switching 11
After value is reduced to bright resistance value, as shown in figure 3, photoconductivity switching 11 forms RC closed-loop paths, storage with Pockers cell electrooptical switching 7
The photoconductivity switching 11 that electric charge on the Pockers cell electrooptical switching 7 is reduced by resistance value is released, Pockers cell electric light
The voltage at 7 both ends is switched by V0It is reduced to VPC, i.e. the actual voltage value of Pockers cell electrooptical switching
Wherein, C is the equivalent capacitance value of Pockers cell electrooptical switching, and t is prefix pulse width, VPCFor 1.2-2.3kV, VPCCenter
It is worth for 1.75kV.
(3) due to prefix pulse and main pulse existence time interval t2, therefore the prefix pulse for sampling light reaches master afterwards
Pulse do not reach before time interval t2Interior, the resistance value of the photoconductivity switching 11 is recovered to resistance in the dark value, is returned equivalent to RC
Road is disconnected, and the electric charge being stored on the Pockers cell electrooptical switching 7 can not be released by photoconductivity switching 11, Pockers cell electricity
The voltage constant of photoswitch 7 is in VPC, the resistance in the dark value of photoconductivity switching is very high, and will not release electric charge, so that Pockers cell is electric
Photoswitch 7 be adjusted after voltages keep constant, laser pulse shape will not be caused to distort；
(4) main pulse of main laser is successively by polarizer 1, faraday's magnetic polarization apparatus 4, polarizer 25,1/4 ripple phase
Position delayer 6, the effect of the 1/4 wave phase delayer 6 are to change the polarization state of laser, are easy to regulation of energy, described inclined
Device 1, faraday's magnetic polarization apparatus 4, the combination settings of polarizer 25 of shaking can separate main pulse from light path, avoid harmful anti-
The influence of light is penetrated, the main pulse of main laser reaches Pockers cell electrooptical switching 7, now, the voltage of Pockers cell electrooptical switching 7
It is constant in V by period in the main pulse of main laserPC, the main pulse of main laser is transferred to after Pockers cell electrooptical switching 7
Speculum 8, the main pulse through speculum 8 turn into the main pulse of sampling light, are reflected back toward the master pulse for main laser of main optical path
Punching, now, the main pulse laser energy of main laser is 0.9Ein, the main pulse of the main laser is in sequential relationship to be sampled
Between the prefix pulse of light and the main pulse for sampling light, second of the main pulse of main laser by Pockers cell electrooptical switching 7, this
When, the main pulse for sampling light is not yet transferred to photoconductivity switching 11, and the voltage of Pockers cell electrooptical switching 7 is in second of main pulse
It is constant in V by periodPC, the main pulse of main laser afterwards is transferred to 1/4 wave phase delayer 6, polarizer 25, farad successively
Magnetic polarization apparatus 4, polarizer 1, the output of slicing switch 12, are then exported, now for unwanted impurity light by polarizer 25
Slicing switchs 12 both ends and does not apply voltage, is acted on without slicing, and the main pulse energy of main laser is adjusted to Eout, i.e. Eout=
0.9T·Ein, whereinPockers cell electrooptical switching 7 and polarizer are passed through in the main pulse of main laser twice
The round trip transmissivity of two combinations, T 30%-70%, T central value are 50%, obtain the laser pulse of energy stabilization.Swash main
Light passes twice through Pockers cell electrooptical switching 7, reduces the operating voltage of Pockers cell electrooptical switching 7, is advantageous to laser pulse
The stabilization of energy.
During specific works, when this hair pulse energy does not rise and fall, sampling the prefix pulse of light makes photoconductivity switching 11
Centered on dynamic electric resistor becomes, correspondingly make the virtual voltage V of Pockers cell electrooptical switching 7PC1.75kV centered on reduction, it is double
Journey transmissivity T=50%, so that the main pulse energy of main optical path output is Eout, i.e. 0.9 × 0.5Ein；When this hair laser pulse
When energy is higher, sampling the prefix pulse of light makes the dynamic electric resistor of photoconductivity switching 11 become less than central value, correspondingly makes general
More, the virtual voltage V of Pockers cell electrooptical switching 7 of the charge discharging resisting at the both ends of kerr cell electrooptical switching 7PCLess than 1.75kV,
Round trip transmissivity T ＜ 50%, so that the main pulse energy of main optical path output is reduced to Eout；When this hair pulsed laser energy is inclined
When low, the energy of main laser and sampling light can be relatively low, and sampling the prefix pulse of light makes the dynamic electric resistor of photoconductivity switching 11 slightly
More than central value, correspondingly reduce the charge discharging resisting at the both ends of Pockers cell electrooptical switching 7, the reality of Pockers cell electrooptical switching 7
Border voltage VPCHigher than 1.75kV, round trip transmissivity T ＞ 50%, so that the main pulse energy of main optical path output is increased to Eout, from
And realize laser energy stability.Due to main optical path main pulse by period, the transmissivity T of Pockers cell electrooptical switching 7 not with
Time change, therefore Laser pulse time will not be caused to distort.
Using the device and laser energy stability method of the present embodiment, when main pulses are sent out persistently in 20 sent to seed light source
Between t1Regulation of energy is carried out for 200ps laser pulse, prefix pulse is rectangular laser pulse, and pulse duration t is 1ns,
Prefix pulse and the interval time t of main pulse2For 6ns, the time delay t of light is sampled3For 3ns, from calculating, photoconduction is opened
The central value of the bright resistance value of pass is 144 Ω, realizes energy stabilization control by adjusting light intensity adjustable attenuator 9, detects each
Send out the input laser energy E of pulseinWith output laser energy Eout, as a result as shown in Figure 4.As can be seen from Figure, seed light source
Pulse energy rises and falls very big between (input) laser hair and hair that send, and PV values (peak-to-valley value) reach 50%, and RMS value is (square
Root) 16.8% is up to, the energy of laser pulse (output) hair and hair after the apparatus and method of the present embodiment are stable rises
Volt is reduced to 3.6%, and RMS value is only 1%, significantly reduces the fluctuation of energy between laser pulse hair and hair.
Fig. 5 is the main pulse input waveform and output waveform for appointing the 1 hair laser pulse taken in above-mentioned 20 hair laser pulses, by
It can be seen from the figure that, after the apparatus and method of the present embodiment are stable, the output waveform and input waveform of main pulse are complete
Unanimously, the distortion of waveform is not caused.
The applicable laser pulse duration of the present invention is not limited in 200ps, and it is shorter or more to be also applied for the duration
Long laser pulse, such as below 100fs short pulse or more than 10ns long pulse；The applicable laser pulse shape of the present invention
It is not limited in step-like pulse, is also applied for the pulse of any other waveform, such as Gaussian pulse, square-wave pulse etc. is any whole
Shape pulse.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (6)
1. a kind of laser energy stability device based on prefix pulse, including main optical path and sampling light path, the main optical path include
Seed light source, Pockers cell electrooptical switching, the speculum set gradually, it is characterised in that the Pockers cell electrooptical switching is
Voltage is previously applied, the main optical path also includes slicing and switched, and the main optical path sends the transmission of laser according to seed light source
Path set gradually for：Pockers cell electrooptical switching, speculum, slicing switch, the sampling light path include the light set gradually
Strong adjustable attenuator, coupler, photoconductivity switching, the light intensity adjustable attenuator is located at the speculum and Pockers cell electricity
The relative side of photoswitch, the coupler are connected with the photoconductivity switching by optical fiber, the both ends of the photoconductivity switching
The two poles of the earth with Pockers cell electrooptical switching are connected respectively；
The main optical path also includes polarizer one, faraday's magnetic polarization apparatus, polarizer two, 1/4 wave phase delayer, the key light
The laser emission path that road is sent according to seed light source set gradually for：Polarizer one, faraday's magnetic polarization apparatus, polarizer two,
1/4 wave phase delayer, Pockers cell electrooptical switching, speculum, slicing switch；
The laser energy stability method of the described laser energy stability device based on prefix pulse, comprises the following steps：
(1) the Pockers cell electrooptical switching is previously applied voltage V0, electric charge is stored in the electrode of Pockers cell electrooptical switching, so
Seed light source first sends prefix pulse before main pulse is sent afterwards, and the duration of the prefix pulse is t, the main pulse
Duration is t1, the time interval of the prefix pulse and main pulse is t2, meet t1＜ t2, prefix pulse and main pulse are equal
Transmitted along main optical path, obtain the prefix pulse of main laser and the main pulse of main laser, main pulse laser energy is Ein；
(2) after the prefix pulse for the main laser that step (1) obtains is transferred to speculum, through speculum prefix pulse turn into take
The prefix pulse of sample light, is reflected back toward the prefix pulse for main laser of main optical path, and the prefix pulse of the main laser is along key light
After polarizer one is transported in road second pass, pruned by slicing switch, the prefix pulse of the sampling light declines by light intensity is adjustable
After subtracting the regulation of device and the coupling of coupler, photoconductivity switching is transferred to by optical fiber, make the photoconductivity switching resistance value by
Resistance in the dark value is reduced to bright resistance value RAS, photoconduction that the electric charge that is stored on the Pockers cell electrooptical switching is reduced by resistance value
Switch is released, and the voltage at Pockers cell electrooptical switching both ends is by V0It is reduced to VPC, i.e. the virtual voltage of Pockers cell electrooptical switching
ValueWherein, C be Pockers cell electrooptical switching equivalent capacitance value, t be prefix pulse it is lasting when
Between；
(3) the prefix pulse due to main laser and main pulse existence time interval t2, therefore in this time interval, the light
The electric charge that the resistance value of conductance switch is recovered to resistance in the dark value, to be stored on the Pockers cell electrooptical switching can not pass through photoconduction
Switch is released, and the voltage constant of Pockers cell electrooptical switching is in VPC；
(4) main pulse of main laser is successively by polarizer one, faraday's magnetic polarization apparatus, polarizer two, the delay of 1/4 wave phase
Device, be transferred to Pockers cell electrooptical switching, now, the voltage of Pockers cell electrooptical switching main pulse by period it is constant
VPC, main pulse is transferred to speculum after Pockers cell electrooptical switching, and the main pulse through speculum turns into the master of sampling light
Pulse, the main pulse for main laser of main optical path is reflected back toward, now, the main pulse laser energy of main laser is 0.9Ein, it is described
Between the main pulse of prefix pulse and sampling light of the main pulse of main laser in sampling light in sequential relationship, the main laser
Main pulse second by Pockers cell electrooptical switching, now, the main pulse for sampling light is not yet transferred to photoconductivity switching, general
The voltage of kerr cell electrooptical switching is constant in V by period in the main pulse of main laserPC, the main pulse of main laser afterwards passes successively
It is defeated to be exported to 1/4 wave phase delayer, polarizer two, faraday's magnetic polarization apparatus, polarizer one, slicing switch, the master of main laser
Pulse energy is adjusted to Eout, i.e. Eout=0.9TEin, the laser pulse of energy stabilization is obtained, whereinIt is the transmissivity that main laser passes twice through Pockers cell electrooptical switching.
2. a kind of laser energy stability device based on prefix pulse according to claim 1, it is characterised in that described anti-
Penetrate mirror and be coated with reflectance coating, light leak rate is 10%.
3. a kind of laser energy stability device based on prefix pulse according to claim 1, it is characterised in that by changing
Become the length of sampling light path optical fiber, make prefix pulse of the main pulse of the main laser in sampling light in sequential relationship with taking
Between the main pulse of sample light.
4. a kind of laser energy stability device based on prefix pulse according to claim 1, it is characterised in that described general
Kerr cell electrooptical switching is potassium dideuterium phosphate electrooptical switching, and round trip work, 1/4 wave voltage is 3.5kV, and equivalent capacitance value C is
10pF。
5. a kind of laser energy stability device based on prefix pulse according to claim 1, it is characterised in that described general
Kerr cell electrooptical switching is previously applied voltage V0For 3.5kV, the transmissivity T is 30-70%.
A kind of 6. laser energy stability device based on prefix pulse according to claim 1, it is characterised in that the light
Conductance switch is GaAs photoconductive switch, and resistance in the dark value is megohm order of magnitude, and bright resistance value is ohm order of magnitude.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084897A (en) * | 1995-08-31 | 2000-07-04 | Komatsu, Ltd. | Laser processing device and laser device |
| CN103576331A (en) * | 2012-08-09 | 2014-02-12 | 中国科学院西安光学精密机械研究所 | Signal to noise ratio improving device and method for chirped pulse laser |
| CN204376191U (en) * | 2015-02-13 | 2015-06-03 | 中国工程物理研究院激光聚变研究中心 | A kind of laser energy stability device based on prefix pulse |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084897A (en) * | 1995-08-31 | 2000-07-04 | Komatsu, Ltd. | Laser processing device and laser device |
| CN103576331A (en) * | 2012-08-09 | 2014-02-12 | 中国科学院西安光学精密机械研究所 | Signal to noise ratio improving device and method for chirped pulse laser |
| CN204376191U (en) * | 2015-02-13 | 2015-06-03 | 中国工程物理研究院激光聚变研究中心 | A kind of laser energy stability device based on prefix pulse |
Non-Patent Citations (1)
| Title |
|---|
| 光电预偏置激光脉冲稳幅器性能研究;郭小东 等;《强激光与粒子束》;19971130;第9卷(第4期);全文 * |
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