CN219419835U - Laser device with self-reference light - Google Patents
Laser device with self-reference light Download PDFInfo
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- CN219419835U CN219419835U CN202320499603.5U CN202320499603U CN219419835U CN 219419835 U CN219419835 U CN 219419835U CN 202320499603 U CN202320499603 U CN 202320499603U CN 219419835 U CN219419835 U CN 219419835U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The utility model discloses a laser device with self-reference light. The utility model comprises a seed source, a stretcher, a first amplifier, a first pumping source, a menu system, a second amplifier, a second pumping source, a compressor, a first reflecting mirror, a second reflecting mirror, a reference light switch and a three-phase switch; the utility model does not need to externally put reference light, and is more economical; the quality of the self-reference light and the quality of the main laser beam, including the same size, divergence angle and wavelength of the light spot, can accurately replace the original laser for debugging a subsequent targeting system, and are equivalent to the debugging result of the main laser; the safety in use is increased by adding the reference optical switch, so that accidents caused by misoperation are avoided; the mKHz laser pulse has high repetition frequency, is favorable for human eyes to observe, and is very convenient to be used as self-reference light for subsequent adjustment.
Description
Technical Field
The utility model relates to the field of lasers, in particular to a laser device with self-reference light.
Background
After the chirped laser pulse amplification (CPA) is proposed, the peak power of the laser device is developed in a leap way, and the peak power of the laser pulse can reach a plurality PW (10 15 W), the laser intensity can reach 10 22 W/cm2. Such intense field lasers are widely used in laser plasma interactions.
As shown in fig. 1, a common CPA system is shown, in which a seed source generates ultrashort pulses (the pulse width is usually in the order of picoseconds or femtoseconds) as seed source pulses, the seed source pulses are stretched in time by a stretcher to obtain long pulses (the pulse width length is in the order of tens of picoseconds to nanoseconds, the pulse width length after specific stretching depends on the energy which is finally required to be amplified), the stretched long pulses are amplified by an amplifier group to obtain high-energy pulses, the pump supplies energy to the amplifier group, the high-energy laser pulses finally compress the time scale of the pulses to the minimum (the pulse width order of the return seed source pulses) by a compressor to obtain strong-field laser pulses with high peak power, and the output pulses are further transmitted to a target area for targeting.
And adding reference light between the target area shooting position and the compressor, wherein the laser spot size, wavelength, divergence angle and the like of the reference light are equivalent to those of main laser output by the compressor, so that the reference light can be used for preparing the target area instead of the main laser. However, the reference light is an independent laser, the laser wavelength, the optical handle size, the divergence angle and the like can only be matched with the main laser as far as possible, the main laser cannot be identical to the main laser, the path of the main laser is different from that of the reference light, and the substituted wave front information is different, so that the reference light has little significance in replacing the main laser during focusing.
Disclosure of Invention
In view of the above problems in the prior art, the present utility model provides a laser device with self-reference light.
The laser device with self-reference light of the present utility model includes: the system comprises a seed source, a stretcher, a first amplifier, a first pump source, a menu system, a second amplifier, a second pump source, a compressor, a first reflecting mirror, a second reflecting mirror, a reference light switch and a three-phase switch; after laser generated by the seed source enters the stretcher, the laser is amplified by a first amplifier, a first pumping source is connected to the first amplifier, the repetition frequency of the first pumping source is mKHz, and the first amplifier outputs a repetition frequency mKHz laser pulse; the mKHz laser pulse output by the first amplifier is subjected to menu selection by a menu system to obtain nHz laser pulse, m and n are integers which are larger than 1 and smaller than 10 respectively, the nHz laser pulse enters the second amplifier to be amplified, the second pumping source is connected to the second amplifier, the laser output by the second amplifier enters the compressor to be compressed, and the output laser is sent to a target area to perform target shooting;
the menu system selects n laser pulses in m multiplied by 1000 laser pulses within 1 second as main laser, sends the main laser to the second amplifier, and outputs the rest m multiplied by 1000-n laser pulses to the menu system, wherein the m multiplied by 1000-n laser pulses are called self-reference light, the self-reference light is output from the menu system, is respectively reflected and transmitted by a first reflecting mirror and a second reflecting mirror and then is transmitted back to the menu system, the first reflecting mirror and the second reflecting mirror form a reference light loop, and a reference light switch is added between the self-reference light output from the menu system and the reference light loop; the self-reference light returns to the menu system through the reference light loop and then enters the target area through the subsequent second amplifier and compressor; the reference light switch and the second pump source are connected to the same power supply through the three-phase switch, the power supply is connected with the second pump source or the reference light switch, and the second pump source or the reference light switch can work;
the three-phase switch is provided with three paths, namely a first path, a second path and a third path, and only one path can be selectively communicated at a time; the first passage is connected with the reference optical switch, the second passage is connected with the second pumping source, and the third passage is connected with the ground;
when the first passage is communicated and the reference optical switch is electrified, the reference optical switch is turned on, laser pulses return to the menu system again after passing through the reference optical loop through the reference optical switch, all pulses of the mKHz laser pulses can enter the second amplifier, and all subsequent optical paths are provided for reference from the reference light, and the second amplifier, the compressor and the target area are included; when the second path is communicated and the reference optical switch is powered off, the reference optical switch is turned off, laser pulses cannot enter the reference optical loop through the reference optical switch and then return to the menu system again, only the selected nHz laser pulses enter the second amplifier, and the laser device normally works to output nHz laser pulses.
When the first passage of the three-phase switch is communicated and the reference light is switched on, the second pumping source is not communicated with the power supply, the second pumping source cannot be started, the second amplifier is not supplied with energy and has no high-energy laser output, so that when the self-reference light is used as a subsequent adjustment light path, the subsequent light path has no high-energy laser, and the safety of operators is ensured;
when the second path of the three-phase switch is communicated and the second pumping source is connected with the power supply, the reference light is not communicated with the power supply, the reference light switch is closed, the second amplifier is not interfered by the self-reference light, and the laser works normally;
when the third path of the three-phase switch is communicated, neither the reference light switch nor the second pump source can operate, and the reference light switch is used as a state when the laser is not operated.
The menu system comprises a first polarization spectroscope, a pockels cell and a second polarization spectroscope; the first and second polarization spectroscopes are used for transmitting horizontal polarization laser pulses and reflecting vertical polarization laser pulses; the Prkerr box is an electro-optical device, the initial 0 voltage state of the Prkerr box is a half-wave plate, the Prkerr box is a full-wave plate after being superimposed with the initial half-wave plate state after half-wave voltage is applied, and the full-wave plate has no change to the light polarization state; when the pockels cell is in a 0-voltage state, when the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is a half-wave plate, the polarization is changed from horizontal polarization to vertical polarization, and when the vertical polarization laser pulse passes through the second polarization spectroscope, the vertical polarization laser pulse is reflected to be used as self-reference light, and the self-reference light enters a reference light loop; when the pockels cell applies half-wave voltage, the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is full-wave plate, the polarization is not changed to be horizontal polarization, the horizontal polarization laser pulse is transmitted when passing through the second polarization spectroscope, one laser pulse is ensured to be transmitted through the second polarization spectroscope, the half-wave voltage repetition frequency of the pockels cell is nHz, and the input laser is selected from the mKHz to be nHz weight-frequency laser.
The vertically polarized self-reference light reflected by the second polarization beam splitter in the menu system is incident to the first reflecting mirror at 45 degrees; a reference light switch is added between the second polarization spectroscope and the first reflecting mirror; the first reflecting mirror reflects the self-reference light at 45 degrees into the second reflecting mirror, the second reflecting mirror reflects the self-reference light and vertically enters the first polarization beam splitter, the first polarization beam splitter reflects the self-reference light to enter the pockels cell again and coincides with the main laser, the pockels cell is still at 0 voltage, the pockels cell is represented as a half wave plate, the self-reference light is horizontally polarized after being reflected by the first polarization beam splitter, and the self-reference light is transmitted to enter the second amplifier through the second polarization beam splitter prism after being horizontally polarized after being reflected by the pockels cell.
The initial 0 voltage state of the pockels cell is a half-wave plate, and during the half-wave voltage applied by the pockels cell, the horizontally polarized laser pulse is transmitted to the pockels cell through the first polarization spectroscope, the polarization is still horizontally polarized after passing through the pockels cell, and the horizontally polarized laser pulse is transmitted to the second amplifier through the second polarization spectroscope; the start time t0 of the Prkel box for applying the half-wave voltage is between two laser pulses of the mKHz laser pulse, the cut-off time of the half-wave voltage is t0+Deltat, deltat is less than or equal to 1ms, and only one laser pulse passes through the Prkel box during the period of applying the half-wave voltage by the Prkel box, and the half-wave voltage repetition frequency of the Prkel box is nHz.
Wherein the compressor output is greater than 300mJ, the spot size is less than 20mm, and the first amplifier output is greater than 2-5 mJ, at which time the self-reference can be used for the target region. The self-reference light energy density of the target area is 0.3-1 mJ/cm 2 The self-reference light is convenient for subsequent operation, and is used for target area debugging preparation work.
When the self-reference light is used for debugging the second amplifier, the condition that the output of the second amplifier is smaller than 5J energy is applicable, and when the size of a light plate of the 5J energy amplifier is smaller than 30mm and the output of the first amplifier is larger than 2-5 mJ, the light spot size is larger, but the light does not pass through the compressor at the moment, the energy is higher than the target area, and the debugging of the second amplifier is facilitated.
The pockels cell is an electro-optical device, is equivalent to a voltage-controlled wave plate, comprises an electro-optical crystal and a high-voltage power supply, and controls the optical property of the electro-optical crystal by applying voltage to the electro-optical crystal, wherein the voltage state of the pockels cell 0 is a half-wave plate; when a voltage is applied to the electro-optic crystal, the electro-optic crystal superimposes the optical property after the voltage is applied to the electro-optic crystal in an initial state; when the applied voltage of the electro-optic crystal changes the optical property into a half-wave plate, the applied voltage is half-wave voltage; because the initial 0 voltage state of the Prkeer box is a half-wave plate, the Prkeer box is displayed as a full-wave plate after being superimposed with the initial half-wave plate state after half-wave voltage is applied, namely the light polarization state is not changed; the polarization state of the laser is regulated and controlled by controlling the voltage of the Prkeer box, so that the laser is reflected or transmitted when passing through the second polarization spectroscope, and when the half-wave voltage repetition frequency of the Prkeer box is nHz, the input laser is selected from mKHz to be nHz heavy-frequency laser.
The utility model has the advantages that:
the utility model does not need to externally put reference light, and is more economical; the quality of the self-reference light and the quality of the main laser beam, including the same size, divergence angle and wavelength of the light spot, can accurately replace the original laser for subsequent targeting debugging, and are equivalent to the debugging result of the main laser; the safety in use is increased by adding the reference optical switch, so that accidents caused by misoperation are avoided; the mKHz laser pulse has high repetition frequency, is favorable for human eyes to observe, and is very convenient to be used as self-reference light for subsequent adjustment; while the repetition frequency of the nHz laser pulse of the main laser is too low, the main laser is difficult to be directly observed by human eyes.
Drawings
FIG. 1 is a block diagram of a prior art CPA system;
FIG. 2 is a block diagram of the overall structure of a laser device with self-reference light according to the present utility model;
FIG. 3 is a block diagram of a menu system of the present utility model having a laser device with self-referencing light;
fig. 4 is a block diagram of a reference light circuit of a laser device with self-reference light according to the present utility model.
Detailed Description
The utility model will be further elucidated by means of specific embodiments in conjunction with the accompanying drawings.
As shown in fig. 2, the laser device with self-reference light of the present embodiment includes: the system comprises a seed source, a stretcher, a first amplifier, a first pump source, a menu system, a second amplifier, a second pump source, a compressor, a first reflecting mirror, a second reflecting mirror, a reference light switch and a three-phase switch; the laser generated by the seed source enters the stretcher and is amplified by a first amplifier, the first pump source provides energy for the first amplifier, the first pump source has the repetition frequency of mKHz, and the first amplifier outputs the repetition frequency mKHz laser pulse; the mKHz laser pulse output by the first amplifier is subjected to menu selection by a menu system to obtain nHz laser pulse, m and n are integers which are larger than 1 and smaller than 10 respectively, the nHz laser pulse enters the second amplifier to be amplified, the second pumping source provides energy for the second amplifier, the laser output by the second amplifier enters the compressor to be compressed, and the output laser is sent to a target area to perform target shooting;
the menu system selects n periodic laser pulses in m multiplied by 1000 laser pulses in 1 second as main laser, sends the main laser to the second amplifier, and outputs the rest m multiplied by 1000-n laser pulses to the menu system, wherein the m multiplied by 1000-n laser pulses are called self-reference light, the self-reference light is output from the menu system, is respectively reflected and transmitted by a first reflecting mirror and a second reflecting mirror and then is transmitted back to the menu system, the first reflecting mirror and the second reflecting mirror form a reference light loop, and a reference light switch is added between the self-reference light output from the menu system and entering the reference light loop; the self-reference light returns to the menu system through the reference light loop and then enters the target area through the subsequent second amplifier and compressor; the reference light switch and the second pump source are connected to the same power supply through the three-phase switch, the power supply is connected with the second pump source or the reference light switch, and the second pump source or the reference light switch can work;
the three-phase switch is provided with three paths, namely a first path, a second path and a third path, and only one path can be selectively communicated at a time; the first passage is connected with the reference optical switch, the second passage is connected with the second pumping source, and the third passage is connected with the ground;
when the first passage is communicated and the reference optical switch is electrified, the reference optical switch is turned on, laser pulses return to the menu system again after passing through the reference optical loop through the reference optical switch, all pulses of the mKHz laser pulses can enter the second amplifier, and all subsequent optical paths are provided for reference from the reference light, and the second amplifier, the compressor and the target area are included; when the second path is communicated and the reference optical switch is powered off, the reference optical switch is turned off, laser pulses cannot enter the reference optical loop through the reference optical switch and then return to the menu system again, only the selected nHz laser pulses enter the second amplifier, and the whole laser device normally works to output nHz laser pulses.
When the first passage of the three-phase switch is communicated and the reference light is switched on, the second pumping source is not communicated with the power supply, the second pumping source cannot be started, the second amplifier is not supplied with energy and has no high-energy laser output, so that when the self-reference light is used as a subsequent adjustment light path, the subsequent light path has no high-energy laser, and the safety of operators is ensured;
when the second path of the three-phase switch is communicated and the second pumping source is connected with the power supply, the reference light is not communicated with the power supply, the reference light switch is closed, the second amplifier is not interfered by the self-reference light, and the laser works normally;
when the third path of the three-phase switch is communicated, the self-reference light and the second pumping source cannot work, and the self-reference light and the second pumping source are used as the states when the laser is not operated.
As shown in fig. 3, the menu system includes a first polarizing beamsplitter, a pockels cell, and a second polarizing beamsplitter; the first and second polarization spectroscopes are used for transmitting horizontal polarization laser pulses and reflecting vertical polarization laser pulses; the Prkerr box is an electro-optical device, the initial 0 voltage state of the Prkerr box is a half-wave plate, the Prkerr box is a full-wave plate after being superimposed with the initial half-wave plate state after half-wave voltage is applied, and the full-wave plate has no change to the light polarization state; when the pockels cell is in a 0-voltage state, when the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is a half-wave plate, the polarization is changed from horizontal polarization to vertical polarization, and when the vertical polarization laser pulse passes through the second polarization spectroscope, the vertical polarization laser pulse is reflected to be used as self-reference light, and the self-reference light enters a reference light loop; when the pockels cell applies half-wave voltage, the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is full-wave plate, the polarization is not changed to be horizontal polarization, the horizontal polarization laser pulse is transmitted when passing through the second polarization spectroscope, one laser pulse is ensured to be transmitted through the second polarization spectroscope, the half-wave voltage repetition frequency of the pockels cell is nHz, and the input laser is selected from the mKHz to be nHz weight-frequency laser.
As shown in fig. 4, the vertically polarized self-reference light reflected by the second polarizing beamsplitter in the menu system is incident to the first mirror at 45 °; a reference light switch is added between the second polarization spectroscope and the first reflecting mirror; the first reflecting mirror reflects the self-reference light at 45 degrees into the second reflecting mirror, the second reflecting mirror reflects the self-reference light and vertically enters the first polarization beam splitter, the first polarization beam splitter reflects the self-reference light to enter the pockels cell again and coincides with the main laser, the pockels cell is still at 0 voltage, the pockels cell is represented as a half wave plate, the self-reference light is horizontally polarized after being reflected by the first polarization beam splitter, and the self-reference light is transmitted to enter the second amplifier through the second polarization beam splitter prism after being horizontally polarized after being reflected by the pockels cell.
The initial 0 voltage state of the pockels cell is a half-wave plate, and during the half-wave voltage applied by the pockels cell, the horizontally polarized laser pulse is transmitted to the pockels cell through the first polarization spectroscope, the polarization is still horizontally polarized after passing through the pockels cell, and the horizontally polarized laser pulse is transmitted to the second amplifier through the second polarization spectroscope; the start time t0 of the Prkel box for applying the half-wave voltage is between two laser pulses of the mKHz laser pulse, the cut-off time of the half-wave voltage is t0+Deltat, deltat is less than or equal to 1ms, and only one laser pulse passes through the Prkel box during the period of applying the half-wave voltage by the Prkel box, and the half-wave voltage repetition frequency of the Prkel box is nHz.
Wherein the compressor output is greater than 300mJ, the spot size is less than 20mm, and the first amplifier output is greater than 2-5 mJ, at which time the self-reference can be used for the target region. The self-reference light energy density of the target area is 0.3-1 mJ/cm 2 The self-reference light is convenient for subsequent operation, and is used for target area debugging preparation work.
When the self-reference light is used for debugging the second amplifier, the condition that the output of the second amplifier is smaller than 5J energy is applicable, and when the size of a light plate of the 5J energy amplifier is smaller than 30mm and the output of the first amplifier is larger than 2-5 mJ, the light spot size is larger, but the light does not pass through the compressor at the moment, the energy is higher than the target area, and the debugging of the second amplifier is facilitated.
Finally, it should be noted that the examples are disclosed for the purpose of aiding in the further understanding of the present utility model, but those skilled in the art will appreciate that: various alternatives and modifications are possible without departing from the spirit and scope of the utility model and the appended claims. Therefore, the utility model should not be limited to the disclosed embodiments, but rather the scope of the utility model is defined by the appended claims.
Claims (5)
1. A laser device with self-reference light, the laser device with self-reference light comprising: the system comprises a seed source, a stretcher, a first amplifier, a first pump source, a menu system, a second amplifier, a second pump source, a compressor, a first reflecting mirror, a second reflecting mirror, a reference light switch and a three-phase switch; after laser generated by the seed source enters the stretcher, the laser is amplified by a first amplifier, a first pumping source is connected to the first amplifier, the repetition frequency of the first pumping source is mKHz, and the first amplifier outputs a repetition frequency mKHz laser pulse; the mKHz laser pulse output by the first amplifier is subjected to menu selection by a menu system to obtain nHz laser pulse, m and n are integers which are larger than 1 and smaller than 10 respectively, the nHz laser pulse enters the second amplifier to be amplified, the second pumping source is connected to the second amplifier, the laser output by the second amplifier enters the compressor to be compressed, and the output laser is sent to a target area to perform target shooting;
the menu system selects n laser pulses in m multiplied by 1000 laser pulses within 1 second as main laser, sends the main laser to the second amplifier, and outputs the rest m multiplied by 1000-n laser pulses to the menu system, wherein the m multiplied by 1000-n laser pulses are called self-reference light, the self-reference light is output from the menu system, is respectively reflected and transmitted by a first reflecting mirror and a second reflecting mirror and then is transmitted back to the menu system, the first reflecting mirror and the second reflecting mirror form a reference light loop, and a reference light switch is added between the self-reference light output from the menu system and the reference light loop; the self-reference light returns to the menu system through the reference light loop and then enters the target area through the subsequent second amplifier and compressor; the reference light switch and the second pump source are connected to the same power supply through the three-phase switch, the power supply is connected with the second pump source or the reference light switch, and the second pump source or the reference light switch can work;
the three-phase switch is provided with three paths, namely a first path, a second path and a third path, and only one path can be selectively communicated at a time; the first passage is connected with the reference optical switch, the second passage is connected with the second pumping source, and the third passage is connected with the ground;
when the first passage is communicated and the reference optical switch is electrified, the reference optical switch is turned on, laser pulses return to the menu system again after passing through the reference optical loop through the reference optical switch, all pulses of the mKHz laser pulses can enter the second amplifier, and all subsequent optical paths are provided for reference from the reference light, and the second amplifier, the compressor and the target area are included; when the second path is communicated and the reference optical switch is powered off, the reference optical switch is turned off, laser pulses cannot enter the reference optical loop through the reference optical switch and then return to the menu system again, only the selected nHz laser pulses enter the second amplifier, and the laser device normally works to output nHz laser pulses.
2. The laser device with self-reference light according to claim 1, wherein when the first path of the three-phase switch is connected and the reference light is turned on, the second pump source is not connected to the power source, the second pump source cannot be started, the second amplifier has no energy supply, and no high-energy laser is output; when the second path of the three-phase switch is communicated and the second pumping source is connected with the power supply, the reference light is not communicated with the power supply, the reference light switch is closed, and the second amplifier is not interfered by the self-reference light; when the third channel of the three-phase switch is communicated, neither the reference light switch nor the second pump source can work.
3. The laser device with self-referencing light of claim 1, wherein said menu system comprises a first polarizing beamsplitter, a pockels cell, and a second polarizing beamsplitter; the first and second polarization spectroscopes are used for transmitting horizontal polarization laser pulses and reflecting vertical polarization laser pulses; the Prkerr box is an electro-optical device, the initial 0 voltage state of the Prkerr box is a half-wave plate, the Prkerr box is a full-wave plate after being superimposed with the initial half-wave plate state after half-wave voltage is applied, and the full-wave plate has no change to the light polarization state; when the pockels cell is in a 0-voltage state, the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is a half-wave plate, the polarization is changed from horizontal polarization to vertical polarization, the vertical polarization laser pulse is reflected as self-reference light when passing through the second polarization spectroscope, and the self-reference light enters a reference light loop; when the pockels cell applies half-wave voltage, the mKHz laser pulse passes through the pockels cell, the state of the pockels cell is full-wave plate, the polarization is not changed to be horizontal polarization, the horizontal polarization laser pulse is transmitted when passing through the second polarization spectroscope, one laser pulse is ensured to be transmitted through the second polarization spectroscope, the half-wave voltage repetition frequency of the pockels cell is nHz, and the input laser is selected from the mKHz to be nHz weight-frequency laser.
4. A laser device with self-reference light as in claim 3, wherein the vertically polarized self-reference light reflected by the second polarizing beamsplitter in the menu system is incident on the first mirror at 45 °; a reference light switch is added between the second polarization spectroscope and the first reflecting mirror; the first reflecting mirror reflects the self-reference light at 45 degrees into the second reflecting mirror, the second reflecting mirror reflects the self-reference light and vertically enters the first polarization beam splitter, the first polarization beam splitter reflects the self-reference light to enter the pockels cell again and coincides with the main laser, the pockels cell is still at 0 voltage, the pockels cell is represented as a half wave plate, the self-reference light is horizontally polarized after being reflected by the first polarization beam splitter, and the self-reference light is transmitted to enter the second amplifier through the second polarization beam splitter prism after being horizontally polarized after being reflected by the pockels cell.
5. A laser device with self-reference light as in claim 3 wherein said pockels cell initial 0 voltage state is a half wave plate, and during application of half wave voltage by the pockels cell, a horizontally polarized laser pulse is transmitted through the first polarizing beamsplitter to the pockels cell, and polarization remains horizontally polarized after passing through the pockels cell, and is transmitted through the second polarizing beamsplitter to the second amplifier; the start time t0 of the half-wave voltage applied by the Prker box is between two laser pulses of the mKHz laser pulse, the cut-off time of the half-wave voltage is t0+Deltat, deltat is less than or equal to 1ms, and only one laser pulse passes through the Prker box during the half-wave voltage applied by the Prker box.
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