CN110768092A - Laser regenerative amplifier based on acousto-optic effect - Google Patents
Laser regenerative amplifier based on acousto-optic effect Download PDFInfo
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- CN110768092A CN110768092A CN201911028348.0A CN201911028348A CN110768092A CN 110768092 A CN110768092 A CN 110768092A CN 201911028348 A CN201911028348 A CN 201911028348A CN 110768092 A CN110768092 A CN 110768092A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0815—Configuration of resonator having 3 reflectors, e.g. V-shaped resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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Abstract
The invention discloses a laser regenerative amplifier based on acousto-optic effect, belonging to the field of laser regenerative amplification, comprising a laser regenerative amplification cavity, an acousto-optic beam combining/splitting device, an arbitrary waveform signal generator, a first laser working module and a second laser working module; the laser regeneration amplification cavity is used for providing a laser back-and-forth path to realize laser amplification; the acoustic optical combiner/beam splitter loads sound waves, and the light beams generate acoustic and optical effects with the sound waves through the acoustic optical combiner/beam splitter to realize beam combining or beam splitting; the arbitrary waveform signal generator is used for loading the sound wave of the first frequency or the second frequency on the acousto-optic beam combiner/splitter and controlling the transmission direction of the light beam; the light beam transmitted on the cavity light trunk has the e polarization state of the acoustic optical combining beam/beam splitting device; the light beams transmitted on the first optical branch and the second optical branch have the o-polarization state of the acoustic optical combining/splitting device. The invention solves the problem that the existing regenerative amplifier needs to be provided with a polarization controller to prevent the original path return of the optical pulse.
Description
Technical Field
The invention belongs to the field of laser regeneration amplification, and particularly relates to a laser regeneration amplifier based on an acousto-optic effect.
Background
The chirped pulse amplification technology appeared in 1985 improves the peak power of laser pulses, the laser enters a high-intensity development stage, ultrashort pulses and high-energy laser are important light sources of the existing strong physical field, and the regeneration amplification technology is a necessary means for realizing the high-energy output of the ultrashort pulses.
The regenerative amplification technology can adopt an electro-optic effect or an acousto-optic effect to control the cavity entrance and the cavity exit of the optical pulse, the electro-optic effect speed is higher, but the applied voltage is very high, the threshold value of the low-voltage electro-optic effect is lower at present, and the regeneration amplification technology is still in a research stage; the acousto-optic effect is slower than the electro-optic effect, but the applied voltage is not necessarily too high.
In the regeneration amplification field, the optical pulse enters the cavity and then returns for many times to realize multiple energy amplification, and when the pulse is amplified to a certain degree, the pulse exits the cavity to complete the regeneration amplification process through the control of the electro-optic effect or the acousto-optic effect. However, under certain conditions, there is a saturation situation in the amplification of the optical pulse, and the higher the repetition frequency is, the faster the saturation is, and the single pulse energy cannot be made very high.
Meanwhile, in the field of regenerative amplification, in order to prevent damage to components caused by return of an original path when an optical pulse exits a cavity, two methods for solving the problem are mainly used at present, namely, a method I is adopted, a necessary polarization isolation element and a polarization control element are added on an optical path entering and exiting a cavity, so that the control polarization state is different from that of the pulse entering the cavity when the pulse exits the cavity, and the original path cannot be returned when the pulse passes through the polarization isolation element; and in the second method, two electro-optical effect or acousto-optical effect devices are added into the laser regeneration amplification cavity, light pulses enter the cavity from the first device and exit the cavity from the second device, and the light paths of the entering cavity and the exiting cavity are different to prevent the original light path from returning. Both methods increase the complexity of the device, and the second method simultaneously increases the difficulty of pulse in/out control.
Disclosure of Invention
The invention aims to provide a laser regenerative amplifier based on an acousto-optic effect, aiming at solving the problem that the complexity of a device is increased in order to prevent an optical pulse from returning in a primary path in the conventional regenerative amplification method.
In order to achieve the above object, the present invention provides a laser regenerative amplifier based on acousto-optic effect, comprising: the device comprises a laser regeneration amplification cavity, an acousto-optic beam combining/splitting device, an arbitrary waveform signal generator, a first laser working module and a second laser working module;
under the working state, after the first sound wave and the second sound wave are loaded on the acousto-optic beam combiner/splitter by the arbitrary waveform signal generator, the light beams generate acousto-optic interaction through the acousto-optic beam combiner/splitter to form a Y-shaped light path; the laser regeneration amplification cavity comprises a first reflector, a second reflector and a third reflector, and the Y-shaped light path comprises a cavity light trunk path, a first light branch path and a second light branch path; the first reflector of the laser regeneration amplification cavity is positioned at one end of the cavity light trunk, and the second reflector is positioned at the other end of the first light branch; the third reflector is positioned at the other end of the second optical branch; one end of the first optical branch, one end of the second optical branch and the other end of the cavity optical trunk form a node; the acoustic optical combiner/splitter is located at the node; the distance between the acoustic optical combiner/beam splitter and the second reflecting mirror is equal to the distance between the acoustic optical combiner/beam splitter and the third reflecting mirror; the first laser working module is positioned between the acoustic optical combiner/beam splitter and the second reflecting mirror; the second laser working module is positioned between the acoustic beam combiner/beam splitter and the third reflector;
the laser regeneration amplification cavity is used for realizing laser amplification by providing a laser back-and-forth path; the acoustic optical combiner/beam splitter loads sound waves, and the light beams generate acoustic and optical effects with the sound waves through the acoustic optical combiner/beam splitter to realize beam combining or beam splitting; the arbitrary waveform signal generator is used for loading the sound wave of the first frequency or the second frequency on the acousto-optic beam combiner/splitter and controlling the transmission direction of the light beam; the first laser working module and the second laser working module are used for gain amplification of light beams;
wherein, the light beam transmitted on the cavity light trunk has the e polarization state of the acoustic optical combining/beam splitting device; the light beams transmitted on the first optical branch and the second optical branch have the o-polarization state of the acoustic optical combining/splitting device.
Preferably, the laser regenerative amplifier based on acousto-optic effect further comprises a polarization controller, which is placed in the cavity light trunk; or the cavity light trunk, the first light branch and the second light branch; or a first optical branch and a second optical branch; the polarization controller arranged on the cavity light trunk is used for transmitting the light beam with the e polarization state of the acoustic optical combiner/beam splitter; and the polarization controller arranged on the cavity light branch is used for transmitting the light beam with the o polarization state of the acoustic optical combiner/beam splitter.
Preferably, when the arbitrary waveform signal generator loads the first frequency sound wave and the second frequency sound wave, the light beam with the e polarization state of the acousto-optic beam combiner/splitter enters the cavity light trunk, and two beams of o polarization state diffracted lights with acousto-optic beam combiner/splitter with different deflection angles are generated after passing through the acousto-optic beam combiner/splitter and respectively enter the first light branch and the second light branch, so as to realize beam splitting.
Preferably, when the arbitrary waveform signal generator loads the first frequency sound wave and the second frequency sound wave, the two light beams with the o polarization state of the acousto-optic beam combiner/splitter enter the first optical branch and the second optical branch respectively, and after passing through the acousto-optic beam combiner/splitter, a light beam with the e polarization state of the acousto-optic beam combiner/splitter is formed on the cavity optical trunk, so that beam combining is realized.
Preferably, when the arbitrary waveform signal generator loads the first frequency acoustic wave, the beam with the polarization state of the acoustic-optical beam combiner/beam splitter, which enters the first optical branch, is deflected by the acoustic-optical beam combiner/beam splitter, so as to form a beam with the polarization state of the acoustic-optical beam combiner/beam splitter, which enters the cavity optical trunk.
Preferably, an o-polarized light beam of the acousto-optic beam combiner/splitter enters the cavity light trunk, the acousto-optic beam combiner/splitter loads sound waves of the first frequency and the second frequency alternately, and the light beam passing through the acousto-optic beam combiner/splitter enters the first light branch and the second light branch alternately.
Preferably, the acousto-optic beam combiner/splitter enters the cavity optical trunk, and when the acoustic power of the first frequency and the acoustic power of the second frequency loaded on the acousto-optic beam combiner/splitter are not equal, the energy ratio of the beam entering the first optical branch and the beam entering the second optical branch is different.
Preferably, the polarization controller is a brewster plate.
Preferably, the acousto-optic beam combiner/splitter is a tellurium oxide crystal.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the laser regenerative amplifier based on the acousto-optic effect provided by the invention is provided with three pulse input and output ports, different port input and output can be realized according to the control of loading the sound wave with specific frequency on the acoustic beam combiner/beam splitter, the function is flexibly and variably realized, and the problem that a polarization controller is required to be arranged outside the existing regenerative amplifier to prevent the original path of the optical pulse from returning is solved.
(2) The invention utilizes the acoustic optical beam combiner/beam splitter, the energy of the optical pulse can be separated into the first optical branch and the second optical branch for regeneration and amplification respectively, and the two optical pulses are combined into one optical pulse during output, so that the whole process equivalently realizes the effect of improving the optical pulse under the condition of high repetition frequency.
Drawings
FIG. 1 is a light pulse regenerative amplifier based on acousto-optic effect provided in embodiment 1;
FIG. 2 is a light pulse regenerative amplifier based on acousto-optic effect provided in embodiment 2;
fig. 3 is an optical pulse regenerative amplifier based on the acousto-optic effect provided in embodiment 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a laser regenerative amplifier based on acousto-optic effect, comprising: the device comprises a laser regeneration amplification cavity, an acousto-optic beam combining/splitting device, an arbitrary waveform signal generator, a first laser working module and a second laser working module;
under the working state, after the first sound wave and the second sound wave are loaded on the acousto-optic beam combiner/splitter by the arbitrary waveform signal generator, the light beams generate acousto-optic interaction through the acousto-optic beam combiner/splitter to form a Y-shaped light path; the laser regeneration amplification cavity comprises a first reflector, a second reflector and a third reflector, and the Y-shaped light path comprises a cavity light trunk path, a first light branch path and a second light branch path; the first reflector of the laser regeneration amplification cavity is positioned at one end of the cavity light trunk, and the second reflector is positioned at the other end of the first light branch; the third reflector is positioned at the other end of the second optical branch; one end of the first optical branch, one end of the second optical branch and the other end of the cavity optical trunk form a node; the acoustic optical combiner/splitter is located at the node; the distance between the acoustic optical combiner/beam splitter and the second reflecting mirror is equal to the distance between the acoustic optical combiner/beam splitter and the third reflecting mirror; the first laser working module is positioned between the acoustic optical combiner/beam splitter and the second reflecting mirror; the second laser working module is positioned between the acoustic beam combiner/beam splitter and the third reflector;
the laser regeneration amplification cavity is used for realizing laser amplification by providing a laser back-and-forth path; the acoustic optical combiner/beam splitter loads sound waves, and the light beams generate acoustic and optical effects with the sound waves through the acoustic optical combiner/beam splitter to realize beam combining or beam splitting; the arbitrary waveform signal generator is used for loading the sound wave of the first frequency or the second frequency on the acousto-optic beam combiner/splitter and controlling the transmission direction of the light beam; the first laser working module and the second laser working module are used for gain amplification of light beams;
wherein, the light beam transmitted on the cavity light trunk has the e polarization state of the acoustic optical combining/beam splitting device; the light beams transmitted on the first optical branch and the second optical branch have the o-polarization state of the acoustic optical combining/splitting device.
Preferably, the laser regenerative amplifier based on acousto-optic effect further comprises a polarization controller, which is placed in the cavity light trunk; or the cavity light trunk, the first light branch and the second light branch; or a first optical branch and a second optical branch; the polarization controller arranged on the cavity light trunk is used for transmitting the light beam with the e polarization state of the acoustic optical combiner/beam splitter; and the polarization controller arranged on the cavity light branch is used for transmitting the light beam with the o polarization state of the acoustic optical combiner/beam splitter.
Preferably, when the arbitrary waveform signal generator loads the first frequency sound wave and the second frequency sound wave, the light beam with the e polarization state of the acousto-optic beam combiner/splitter enters the cavity light trunk, and two beams of o polarization state diffracted lights with acousto-optic beam combiner/splitter with different deflection angles are generated after passing through the acousto-optic beam combiner/splitter and respectively enter the first light branch and the second light branch, so as to realize beam splitting.
Preferably, when the arbitrary waveform signal generator loads the first frequency sound wave and the second frequency sound wave, the two light beams with the o polarization state of the acousto-optic beam combiner/splitter enter the first optical branch and the second optical branch respectively, and after passing through the acousto-optic beam combiner/splitter, a light beam with the e polarization state of the acousto-optic beam combiner/splitter is formed on the cavity optical trunk, so that beam combining is realized.
Preferably, when the arbitrary waveform signal generator loads the first frequency acoustic wave, the beam with the polarization state of the acoustic-optical beam combiner/beam splitter, which enters the first optical branch, is deflected by the acoustic-optical beam combiner/beam splitter, so as to form a beam with the polarization state of the acoustic-optical beam combiner/beam splitter, which enters the cavity optical trunk.
Preferably, an o-polarized light beam of the acousto-optic beam combiner/splitter enters the cavity light trunk, the acousto-optic beam combiner/splitter loads sound waves of the first frequency and the second frequency alternately, and the light beam passing through the acousto-optic beam combiner/splitter enters the first light branch and the second light branch alternately.
Preferably, the acousto-optic beam combiner/splitter enters the cavity optical trunk, and when the acoustic power of the first frequency and the acoustic power of the second frequency loaded on the acousto-optic beam combiner/splitter are not equal, the energy ratio of the beam entering the first optical branch and the beam entering the second optical branch is different.
Preferably, the polarization controller is a brewster plate.
Preferably, the acousto-optic beam combiner/splitter is a tellurium oxide crystal.
Example 1
FIG. 1 is a diagram of an optical pulse regenerative amplifier based on acousto-optic effect proposed in embodiment 1, which includes a laser regenerative amplification cavity, a tellurium oxide acousto-optic beam combiner/splitter, a Brewster polarizer, and Nd: YAG laser working substance;
wherein ① is a total reflection mirror, ② is an acousto-optic beam combiner/splitter, ③ is an arbitrary waveform signal generator, ④ is a Brewster polarizer (the first light branch and the second light branch are both arranged), ⑤ is Nd, YAG laser working substances (the first light branch and the second light branch are both arranged), ⑥ is a total reflection mirror (the first light branch and the second light branch are both arranged);
the basic structure of the laser regeneration amplification cavity is Y-shaped, namely a cavity light trunk, a first light branch and a second light branch are arranged after a light beam enters the laser regeneration amplification cavity, and the first light branch and the second light branch have the same length so as to realize the synchronous amplification of split light pulses; the included angles of the three light paths are determined by the working state of the acousto-optic beam combining/splitting device, and all the mirrors forming the laser resonant cavity are all total reflection mirrors;
the tellurium oxide acoustic-optical beam combiner/splitter is positioned at the Y-shaped node of the laser cavity;
the Brewster plate is positioned on the first optical branch and the second optical branch, and the light beam allowed to penetrate is a light beam in the o polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
furthermore, the brewster plate can also be positioned in the cavity light trunk, and the light beam which is allowed to penetrate is the light beam in the e polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
further, the brewster plate can be positioned outside the light beam side of the cavity light trunk, and the transmitted light beam is allowed to be a light beam in an e polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
YAG laser working substances are positioned on the first optical branch and the second optical branch, and the laser working substances are the same to ensure synchronous amplification;
at the moment, the laser regeneration amplification cavity has three ports, namely a cavity light trunk cavity inlet port 1, a first light branch cavity outlet port 2 and a second light branch cavity outlet port 3;
when the pulse enters the cavity, the tellurium oxide acoustic-optical beam combiner/splitter is in a non-working state, no frequency sound wave is loaded, the light pulse does not deflect through the tellurium oxide acoustic-optical beam combiner/splitter and enters a laser regeneration amplification cavity light trunk, and the light pulse is e polarized light of a tellurium oxide crystal;
after the pulse enters the cavity, the cavity enters a pulse amplification state, and the tellurium oxide acousto-optic beam combiner/splitter is loaded with a first frequency f1And a second frequency f2The optical pulse is reflected by a full-reflecting mirror at the cavity optical trunk side and then passes through a tellurium oxide acoustic light combining beam/beam splitter, so that the energy of the optical pulse is divided equally, one part of energy optical pulse enters a first optical branch, the other part of energy optical pulse enters a second optical branch, the two parts of optical pulse respectively interact with Nd and YAG laser working substances on the respective optical branches to realize energy amplification, when the optical pulse passes through the tellurium oxide acoustic light combining beam/beam splitter again, the optical pulse is combined to complete one round trip, and the regeneration amplification is realized by multiple round trips;
when the light pulse energy is amplified to a certain degree and enters a light pulse cavity-out state, the light pulse enters a cavity light trunk, and the tellurium oxide acousto-optic beam combiner/splitter only loads the first frequency f1When the light pulse passes through the tellurium oxide acoustic light combining/splitting device again after being reflected by the full-reflection mirror at the cavity light trunk side, the light pulse is totally deflected to the first light branch for transmission, the light pulse passes through the plane reflection mirror at the first light branch side and then passes through the tellurium oxide acoustic light combining/splitting device again, at the moment, the tellurium oxide acoustic light combining/splitting device is in a non-working state, the sound wave is not loaded, the light pulse does not deflect through the tellurium oxide acoustic light combining/splitting device, and the light pulse is output from the port 2 of the first light branch;
further, in the optical pulse amplification state, the tellurium oxide acousto-optic beam combining/splitting device loads the first frequency f1And a second frequency f2The two frequencies of the sound waves are different in power, so that the energy ratio of each branch entering the cavity is controlled, and the distribution of light pulse energy is realized;
further, in the optical pulse amplification state, when the optical pulse enters the cavity optical trunk circuit in a reciprocating amplification mode every time, the acousto-optic beam combiner/splitter loads the first frequency f alternately1Second frequency f2The optical pulse alternately enters the first optical branch and the second optical branch to provide sufficient time for pumping of the laser working substances of the two branches;
optionally, when the light pulse is in the cavity state, the light pulse enters the cavity light trunk, and the tellurium oxide acousto-optic beam combiner/splitter is loaded with only the first frequency f2When the light pulse passes through the tellurium oxide sound light combining beam/beam splitter again after being reflected by the light trunk full-reflection mirror, the light pulse is totally deflected to the second light branch for transmission, the light pulse passes through the tellurium oxide sound light combining beam/beam splitter again after being reflected by the second light branch full-reflection mirror, at the moment, the tellurium oxide sound light combining beam/beam splitter is in an unoperated state, the sound wave is not loaded, the light pulse does not deflect through the tellurium oxide sound light combining beam/beam splitter, and the light pulse is output from a port 3 of the second light branch.
Example 2
Fig. 2 is an optical pulse regenerative amplifier based on the acousto-optic effect provided in embodiment 2, which includes a laser regenerative amplification cavity, a tellurium oxide acousto-optic beam combiner/splitter, a brewster polarizer, and Nd: YAG laser working substance;
wherein ① is a total reflection mirror, ② is an acousto-optic beam combiner/splitter, ③ is an arbitrary waveform signal generator, ④ is a Brewster polarizer (the first light branch and the second light branch are both arranged), ⑤ is Nd, YAG laser working substances (the first light branch and the second light branch are both arranged), ⑥ is a total reflection mirror (the first light branch and the second light branch are both arranged);
the basic structure of the laser regeneration amplification cavity is Y-shaped, namely a cavity light trunk, a first light branch and a second light branch are arranged after a light beam enters the laser regeneration amplification cavity, and the first light branch and the second light branch have the same length so as to realize the synchronous amplification of split light pulses; the included angles of the three light paths are determined by the working state of the acousto-optic beam combining/splitting device, and all the mirrors forming the laser resonant cavity are all total reflection mirrors;
the tellurium oxide acoustic-optical beam combiner/splitter is positioned at the Y-shaped node of the laser cavity;
the Brewster plate is positioned on the first optical branch and the second optical branch, and the light beam allowed to penetrate is a light beam in the o polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
furthermore, the brewster plate can also be positioned in the cavity light trunk, and the light beam which is allowed to penetrate is the light beam in the e polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
further, the brewster plate may be located outside the first optical branch port 2, allowing the transmitted light beam to be a light beam in o-polarization state of the tellurium oxide acoustic optical combiner/splitter;
YAG laser working substances are positioned on the first optical branch and the second optical branch, and the laser working substances are the same to ensure synchronous amplification;
at the moment, the laser regeneration amplification cavity has three ports, namely a cavity light trunk cavity outlet port 1, a first light branch cavity inlet port 2 and a second light branch cavity outlet port 3;
when the light pulse enters the cavity, the tellurium oxide acousto-optic beam combiner/splitter is in a non-working state and does not load frequency sound waves, at the moment, the light pulse does not deflect from the port 2 of the first light branch circuit through the tellurium oxide acousto-optic beam combiner/splitter and enters the first light branch circuit of the laser regeneration amplification cavity, the pulse polarization is o light of a tellurium oxide crystal, when the light pulse is reflected by a full reflector on the side of the first light branch circuit and then passes through the tellurium oxide acousto-optic beam combiner/splitter, the tellurium oxide acousto-optic beam combiner/splitter loads a first frequency f1The light pulse is deflected and enters the cavity light trunk, and the light pulse is e polarized light of the tellurium oxide crystal;
after the light pulse enters the cavity light trunk for the first time, the cavity light trunk enters a pulse amplification state, and the tellurium oxide acousto-optic beam combining/splitting device loads a first frequency f1And a second frequency f2The optical pulse is reflected by a full-reflecting mirror at the cavity optical trunk side and then passes through a tellurium oxide acoustic light combining beam/beam splitter, so that the energy of the optical pulse is divided equally, one part of the energy pulse enters a first optical branch, the other part of the energy pulse enters a second optical branch, the two parts of the optical pulse respectively interact with Nd and YAG laser working substances on the respective branches to realize energy amplification, when the optical pulse passes through the tellurium oxide acoustic light combining beam/beam splitter again, the optical pulse is combined to complete one round trip, and the regeneration amplification is realized by multiple round trips;
when the energy of the light pulse is amplified to a certain degree after calculation, the light pulse enters a pulse cavity-exiting state, the light pulse enters a cavity light trunk, the tellurium oxide acousto-optic beam combiner/splitter is in a non-working state at the moment, sound waves are not loaded, the light pulse is reflected by a full-reflection mirror at the cavity light trunk side and then passes through the tellurium oxide acousto-optic beam combiner/splitter again, the light pulse is output from the cavity light trunk, and the regeneration amplification process is completed;
further, in the pulse amplification state, the tellurium oxide acousto-optic beam combiner/splitter is loaded with a first frequency f1And a second frequency f2The two frequencies of the sound waves are different in power, so that the energy ratio of each branch entering the cavity is controlled, and the distribution of light pulse energy is realized;
further, in the optical pulse amplification state, when the optical pulse enters the cavity optical trunk circuit in a reciprocating amplification mode every time, the acousto-optic beam combiner/splitter loads the first frequency f alternately1Second frequency f2The optical pulse alternately enters the first optical branch and the second optical branch to provide sufficient time for pumping of the laser working substances of the two branches;
alternatively, when the light pulse is in the cavity state, the light pulse enters the cavity light trunk, and the tellurium oxide acousto-optic beam combiner/splitter is only loaded with the second frequency f2When the light pulse passes through the tellurium oxide acoustic light combining/beam splitting device again after being reflected by the full-reflection mirror at the cavity light trunk side, the light pulse is totally deflected to the second light branch for transmission, the light pulse passes through the tellurium oxide acoustic light combining/beam splitting device again after being reflected by the full-reflection mirror at the second light branch side, at the moment, the tellurium oxide acoustic light combining/beam splitting device is in an inoperative state, the sound wave is not loaded, the light pulse does not deflect through the tellurium oxide crystal, and the light pulse is output from the cavity outlet port 3 of the second light branch.
Example 3
Fig. 3 is an optical pulse regenerative amplifier based on the acoustic-optical beam combination technology provided in embodiment 3, which includes a laser regenerative amplification cavity, a tellurium oxide acoustic-optical beam combination/splitter, a brewster polarizer, and Nd: YAG laser working substance;
wherein ① is a total reflection mirror, ② is an acousto-optic beam combiner/splitter, ③ is an arbitrary waveform signal generator, ④ is a Brewster polarizer (the first light branch and the second light branch are both arranged), ⑤ is Nd, YAG laser working substances (the first light branch and the second light branch are both arranged), ⑥ is a total reflection mirror (the first light branch and the second light branch are both arranged);
the basic structure of the laser regeneration amplification cavity is Y-shaped, namely a cavity light trunk, a first light branch and a second light branch are arranged after a light beam enters the laser regeneration amplification cavity, and the first light branch and the second light branch have the same length so as to realize the synchronous amplification of split light pulses; the included angles of the three light paths are determined by the working state of the acousto-optic beam combining/splitting device, and all the mirrors forming the laser resonant cavity are all total reflection mirrors;
the tellurium oxide acoustic-optical beam combiner/splitter is positioned at the Y-shaped node of the laser cavity;
the Brewster plate is positioned on the first optical branch and the second optical branch, and the light beam allowed to penetrate is a light beam in the o polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
furthermore, the brewster plate can also be positioned in the cavity light trunk, and the light beam which is allowed to penetrate is the light beam in the e polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
further, the brewster plate can be positioned outside the first optical branch window or the second optical branch window (which is required to be the optical branch port of the optical pulse entrance cavity), and the transmitted light beam is allowed to be in the o polarization state of the tellurium oxide acoustic optical combiner/beam splitter;
YAG laser working substances are positioned on the first optical branch and the second optical branch, and the laser working substances are the same to ensure synchronous amplification;
at the moment, the laser regeneration amplification cavity has three ports, namely a cavity light trunk cavity outlet port 1, a first light branch cavity outlet port 2 and a second light branch cavity inlet port 3;
when the light pulse enters the cavity, the tellurium oxide acousto-optic beam combiner/splitter is in a non-working state and does not load frequency sound waves, at the moment, the light pulse does not deflect after passing through the tellurium oxide acousto-optic beam combiner/splitter from the cavity entrance port 3 of the second light branch, enters the second light branch of the laser regeneration amplification cavity, the pulse polarization is o light of tellurium oxide crystals, the light pulse passes through the tellurium oxide acousto-optic beam combiner/splitter after being reflected by a full reflector at the side of the second light branch, and at the moment, the tellurium oxide acousto-optic beam combiner/splitter loads a second frequency f2Sound wave and light pulse ofThe pulse is deflected and enters a cavity light trunk, and the light pulse is e-polarized light of the tellurium oxide crystal;
the optical pulse enters the cavity optical trunk for the first time and then enters an optical pulse amplification state, and the tellurium oxide acousto-optic beam combining/splitting device loads a first frequency f1And a second frequency f2The optical pulse is reflected by a full-reflecting mirror at the cavity optical trunk side and then passes through a tellurium oxide acoustic light combining beam/beam splitter, so that the energy of the optical pulse is divided equally, one part of energy optical pulse enters a first optical branch, the other part of energy optical pulse enters a second optical branch, the two parts of optical pulse respectively interact with Nd and YAG laser working substances on the respective branches to realize energy amplification, when the optical pulse passes through the tellurium oxide acoustic light combining beam/beam splitter again, the optical pulse is combined to complete one round trip, and the regeneration amplification is realized by multiple round trips;
when the light pulse energy is amplified to a certain degree after calculation and enters a light pulse cavity outlet state, the light pulse enters a cavity light trunk, the tellurium oxide acousto-optic beam combiner/splitter is in a non-working state and does not load sound waves, the light pulse is reflected by a full-reflection mirror at the cavity light trunk side and then passes through the tellurium oxide acousto-optic beam combiner/splitter again, the light pulse is output from the cavity light trunk, and the regeneration amplification process is completed;
further, in the optical pulse amplification state, the tellurium oxide acousto-optic beam combiner/splitter is loaded with the first frequency f1And a second frequency f2The two frequencies of the sound waves are different in power, so that the energy ratio of each light branch entering the cavity is controlled, and the distribution of light pulse energy is realized;
further, in the optical pulse amplification state, when the optical pulse enters the cavity optical trunk circuit in a reciprocating amplification mode every time, the acousto-optic beam combiner/splitter loads the first frequency f alternately1Second frequency f2The optical pulse alternately enters the first optical branch and the second optical branch to provide sufficient time for pumping of the laser working substances of the two branches;
alternatively, when the light pulse is in the cavity state, the light pulse enters the cavity light trunk, and the tellurium oxide acousto-optic beam combiner/splitter is only loaded with the first frequency f1The sound wave and the light pulse of (2) are optically dried through the cavityWhen the light pulse passes through the tellurium oxide acoustic optical combiner/splitter again after being reflected by the roadside total reflector, the light pulse is totally deflected to the first optical branch for transmission, the light pulse passes through the tellurium oxide acoustic optical combiner/splitter again after being reflected by the roadside total reflector of the first optical branch, at the moment, the tellurium oxide acoustic optical combiner/splitter is in an inoperative state, no sound wave is loaded, the light pulse does not deflect through a tellurium oxide crystal, and the light pulse is output from the port 2 of the first optical branch.
In summary, the laser regenerative amplifier based on the acousto-optic effect provided by the invention has three pulse input and output ports, can realize different port input and output according to the control of loading the acoustic wave with a specific frequency on the acoustic beam combiner/beam splitter, has flexible and changeable functions, and solves the problem that a polarization controller needs to be arranged outside the existing regenerative amplifier to prevent the optical pulse from returning in the original path.
The invention utilizes the acoustic optical beam combiner/beam splitter, the optical pulse energy can be separated into the first optical branch and the second optical branch for regeneration and amplification respectively, and the two optical pulses are combined into an optical pulse during output, and the whole process is equivalent to the effect of improving the optical pulse energy under the condition of high repetition frequency.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A laser regenerative amplifier based on acousto-optic effect, comprising: the device comprises a laser regeneration amplification cavity, an acousto-optic beam combining/splitting device, an arbitrary waveform signal generator, a first laser working module and a second laser working module;
under the working state, the arbitrary waveform signal generator loads the first sound wave and the second sound wave on the acoustic optical combiner/beam splitter, and the light beam passes through the acoustic optical combiner/beam splitter to generate the acousto-optic action to form a Y-shaped light path; the Y-shaped light path comprises a cavity light trunk, a first light branch and a second light branch; the laser regeneration amplification cavity comprises a first reflector, a second reflector and a third reflector which are respectively positioned at one end of the cavity light trunk, the other end of the first light branch and the other end of the second light branch; one end of the first optical branch, one end of the second optical branch and the other end of the cavity optical trunk form a node; the acoustic optical combiner/splitter is located at a node; the first optical branch and the second optical branch are equal in length; the first laser working module is positioned between the acoustic optical combiner/splitter and the second reflecting mirror; the second laser working module is positioned between the acoustic beam combiner/splitter and the third reflector;
the laser regeneration amplification cavity is used for providing a light beam back-and-forth path to realize laser amplification; the acoustic optical combiner/splitter loads sound waves, and the light beams generate acoustic and optical effects with the sound waves through the acoustic optical combiner/splitter to realize beam combining or beam splitting; the arbitrary waveform signal generator is used for loading the sound wave of the first frequency or the second frequency on the acousto-optic beam combiner/splitter and controlling the transmission direction of the light beam; the first laser working module and the second laser working module are used for gain amplification of light beams;
the light beams transmitted on the cavity light trunk, the first light branch and the second light branch respectively have an e polarization state, an o polarization state and an o polarization state of the acoustic optical combining/beam splitting device.
2. The laser regenerative amplifier according to claim 1, further comprising a polarization controller disposed in the cavity optical trunk; or the cavity optical trunk, the first optical branch and the second optical branch; or the first and second optical branches;
the polarization controller arranged on the cavity light trunk is used for transmitting the light beam with the e polarization state of the acoustic optical combiner/beam splitter; and the polarization controller arranged on the cavity light branch is used for transmitting the light beam with the o polarization state of the acoustic optical combiner/beam splitter.
3. The laser regenerative amplifier of claim 1, wherein when the arbitrary waveform signal generator loads the first frequency acoustic wave and the second frequency acoustic wave, a light beam having e polarization state of the acousto-optic combiner/splitter enters the cavity optical trunk, and two beams of o polarization state diffracted lights having different deflection angles generated by the acousto-optic combiner/splitter respectively enter the first optical branch and the second optical branch to realize beam splitting.
4. The laser regenerative amplifier according to claim 1, wherein when the arbitrary waveform signal generator loads the first frequency sound wave and the second frequency sound wave, the two light beams with the o polarization state of the acoustic optical combiner/splitter enter the first optical branch and the second optical branch, respectively, and after passing through the acoustic optical combiner/splitter, a light beam with the e polarization state of the acoustic optical combiner/splitter is formed on the cavity optical trunk, so as to implement beam combination.
5. The laser regenerative amplifier of claim 1, wherein when the arbitrary waveform signal generator is loaded with the first frequency acoustic wave, the beam with the o polarization state of the acoustic optical combiner/splitter entering the first optical branch is deflected by the acoustic optical combiner/splitter to form a beam with the e polarization state of the acoustic optical combiner/splitter entering the cavity optical trunk.
6. The laser regenerative amplifier of claim 1, wherein when the arbitrary waveform signal generator is loaded with the acoustic wave of the first frequency and the second frequency alternately, the o-polarized beam of the acoustic beam combiner/splitter enters the cavity optical trunk, and the beam passing through the acoustic beam combiner/splitter enters the first optical branch and the second optical branch alternately.
7. The laser regenerative amplifier according to claim 1, wherein the optical coupler/splitter o-polarized beam enters the cavity optical trunk, and when the acoustic power of the first frequency and the acoustic power of the second frequency loaded on the optical coupler/splitter are not equal, the ratio of the energy of the beam entering the first optical branch to the energy of the beam entering the second optical branch is different.
8. The laser regenerative amplifier of claim 2, wherein the polarization controller is a brewster's plate.
9. The laser regenerative amplifier according to any of claims 1 to 8, wherein the acoustic optical combiner/splitter is a tellurium oxide crystal.
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