CN115663581A - Single-frequency dual-wavelength dual-pulse optical parametric oscillator laser - Google Patents

Abstract

A high-frequency stable single-frequency double-pulse optical parametric oscillation laser includes four parts: a single-frequency seed laser, a high-stability optical parametric oscillator resonator, a frequency control component, and a single-frequency double-pulse train pumping source. The invention has the characteristics of narrow line width, high frequency stability, dual-wavelength dual-pulse single-frequency output, expandable wavelength, strong anti-interference ability, stable and reliable characteristics, can further amplify optical parameters and improve pulse energy, and can be used for atmospheric component detection laser radar The laser light source can meet the application requirements of complex environments such as airborne and spaceborne.

Description

Single-frequency dual-wavelength dual-pulse optical parametric oscillator laser

technical field

The invention relates to a pulsed optical parametric oscillation laser, in particular to a single-frequency, double-wavelength, and double-pulse optical parametric oscillation laser.

technical background

The airborne and spaceborne integral path differential absorption radar system is an effective remote sensing device for measuring water vapor, carbon dioxide, methane and other pollutant gases in the atmosphere, and is currently a research hotspot in the earth's carbon cycle. The most important thing in radar is the single-frequency pulsed laser source, which requires both high pulse energy and high frequency stability, as well as multi-wavelength output. Therefore, it is of practical significance to invent a multi-wavelength single-frequency pulse laser with reliable performance.

At present, lasers for laser differential absorption radar are research hotspots. In the implementation process of seed injection into single-frequency single-pulse optical parametric oscillator, the following problems will be encountered.

First, the seed laser is injected into the resonator, and the four-cavity mirror is fine-tuned so that the seed is transmitted multiple times in the resonator, and the fineness of the laser interference signal transmitted by the seed through the resonator is used to characterize the completion of the resonator debugging; after that, the Non-linear crystal, and adjust the angle to meet the requirements of the central wavelength of the pulse output spectrum. Due to the individual differences of the implanted crystals, the transmission interference signal of the above-mentioned seed laser may change, and the cavity mirror cannot be adjusted at this time.

Second, in order to achieve high output frequency stability of parametric optical pulses, that is, the laser pulse frequency jitters to the order of 1 MHz, the frequency control component is required to generate a small step size to adjust the cavity length, and high-precision control components are required, as well as PZT The ripple of the drive circuit is controlled, which poses a challenge to the long-term reliable operation of the electronics.

Third, the previous method can only achieve single-wavelength optical parametric oscillation laser output. For the second seed laser frequency of the single-frequency dual-wavelength dual-pulse optical parametric oscillator, the output pulse frequency needs to be controlled by a new method.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a single-frequency, double-wavelength, and double-pulse optical parametric oscillator laser. The basis for selecting the frequency of the second seed laser and the method for stabilizing the frequency of the second pulse laser are presented.

Technical solution of the present invention is:

A single-frequency dual-wavelength dual-pulse optical parametric oscillation laser is characterized in that it includes four parts: a single-frequency seed laser, a high-stability optical parametric oscillator resonator, a frequency control component, and a single-frequency dual-pulse train pumping source:

The single-frequency seed laser includes: a first seed laser and a second seed laser, a magneto-optical switch, a polarization-maintaining fiber beam splitter, a collimating mirror, an isolator, a focusing mirror, a first half-wave plate, and a dichromatic mirror. The output end of the first seed laser is connected to the input end of the polarization-maintaining fiber beam splitter, and the polarization-maintaining fiber beam splitter splits the laser output from the first seed laser, and the The first output end of the polarization-maintaining fiber beam splitter is connected to the first input end of the magneto-optical switch, and the output end of the second seed laser is connected to the second input end of the magneto-optic switch, so The output end of the magneto-optical switch outputs the seed laser light sequentially through the collimator, isolator, focusing mirror, first half-wave plate and dichroic mirror, and then enters the resonant cavity of the high-stability optical parametric oscillator;

The resonant cavity of the high-stability optical parametric oscillator includes a high-stability resonant cavity housing, a first cavity mirror, a second cavity mirror, a third cavity mirror, a fourth cavity mirror, a compensation plate, a nonlinear crystal, and a thermoelectric cooling sheet, piezoelectric ceramic sheet, the first photodetector and the 45° reflector outside the cavity, there are four cavity mirrors in the high-stability resonant cavity housing, and the seed laser transmission direction transmitted by the dichroic mirror is sequentially It is the first cavity mirror, the second cavity mirror, the third cavity mirror and the fourth cavity mirror, and finally output through the first cavity mirror and the 45° mirror outside the cavity. The optical path between the two cavity mirrors has the nonlinear crystal and is placed in the thermoelectric cooling sheet, the third cavity mirror is fastened on the piezoelectric ceramic sheet, and the third cavity The compensation sheet is arranged between the mirror and the fourth cavity mirror, and the first photodetector is arranged on the optical path extension line of the fourth cavity mirror;

The frequency control component consists of a second half-wave plate, a coupling mirror, an acousto-optic modulator, a polarization-maintaining fiber coupler, a second photodetector, a data acquisition and processing unit, a digital-to-analog conversion component, and a piezoelectric ceramic drive circuit. Composition; the second half-wave plate is located in the transmission direction of the 45° mirror outside the cavity, the second input end of the polarization-maintaining fiber coupler and the second output end of the optical fiber splitter connected; the output end of the polarization-maintaining fiber coupler is connected to the input end of the second photodetector, and the output end of the second photodetector is connected to the first input of the data acquisition and processing unit The output end of the data acquisition and processing unit is connected to the piezoelectric ceramic drive circuit through the digital-to-analog conversion assembly, and the output end of the piezoelectric ceramic drive circuit is connected to the piezoelectric ceramic sheet;

The single-frequency double-pulse train pumping source includes a single-frequency pulse-train laser and its electronic controller, a third half-wave plate and a beam reducer group, and the single-frequency pulse-train laser outputs a double-pulse train with a fixed repetition rate The pump laser light enters the resonant cavity of the high-stability optical parametric oscillator through the third half-wave plate and the beam reducer group reflected by the dichroic mirror in turn, and the output terminal of the electronic controller is connected with the The control terminal of the magneto-optical switch is connected to provide a timing control signal for the magneto-optic switch to determine the switching time between the wavelength of the first seed laser and the second seed laser, and the output terminal of the electronic controller is also connected to the The second input terminal of the data collection and processing unit is connected to provide a trigger signal to the data collection and processing unit;

Under the control of the frequency control component, at the starting point of each working cycle, after the magneto-optical switch receives a trigger signal, the laser output from the first wavelength seed laser is injected into the magneto-optic switch The high-stable optical parametric oscillator resonator cavity, and an initial voltage is applied to the piezoelectric ceramic sheet, when the single-frequency pulse-train pump laser output by the single-frequency pulse train laser passes through the two-color The mirror is input into the resonant cavity of the high-stability optical parametric oscillator, and the resonant cavity of the high-stability optical parametric oscillator obtains the parametric oscillation pulse train laser and outputs the free-space laser through the second half-wave plate and the coupling mirror, The coupling mirror couples the free-space laser into the polarization-maintaining fiber, and then passes through the acousto-optic modulator and the polarization-maintaining fiber coupler. In the polarization-maintaining fiber coupler, the first The first pulse beats with the other part of the first wavelength seed laser output from the fiber beam splitter, which is recorded as the beat signal 1; and between the first pulse and the second pulse of the parametric optical pulse train, the magnetic When the optical switch receives the trigger signal provided by the single-frequency double-pulse laser electronics, the laser of the magneto-optical switch is switched to the second wavelength seed laser and injected into the resonant cavity of the high-stability optical parametric oscillator to obtain the parameter The second pulse in the optical pulse train; the beat frequency signal 1 is collected and processed by the data acquisition and processing unit, and the frequency value of the beat frequency signal is compared with the reference modulation frequency. The conversion component obtains the corresponding resonant cavity length tuning amount, applies the corresponding voltage to the piezoelectric ceramic sheet through the piezoelectric ceramic drive circuit, and tunes the resonant cavity length, and finally satisfies the requirements of the optical parametric oscillator The frequency of the first pulse is locked on the frequency of the first seed laser; after the first pulse emits light, the voltage of the piezoelectric ceramic driving circuit remains unchanged until the second pulse arrives, determined by the frequency of the second seed laser Control the second pulse wavelength.

The wavelength bands covered by the first seed laser and the second seed laser include but are not limited to 2 μm, 1.57 μm, 1.64 μm, 0.97 μm and 0.94 μm, and the wavelength difference between the second seed laser and the first seed laser is the Integer multiples of the free spectral range of the optical parametric oscillator resonator.

The pump pulse train output by the single-frequency pulse train laser is a single-wavelength double pulse train, and the interval between the pulses in the pulse train is adjusted within a certain range by the electronic controller as required; the seed laser consists of The parametric light pulse train is a dual-wavelength pulse train, the wavelengths of which are consistent with the first seed laser and the second seed laser, and the pulse interval is consistent with the interval of the pump pulse train.

The housing of the resonant cavity of the high-stability optical parametric oscillator is processed in an integrated structure, the first cavity mirror and the second cavity mirror are directly fixed on the vertical wall of the housing, and the third cavity mirror is directly fixed on the vertical wall of the housing. The cavity mirror and the fourth cavity mirror are fixed on the vertical wall of the high-stability resonant cavity shell through adapters. The nonlinear crystal is placed in the heat sink metal block, and the temperature can be adjusted. The metal block is fixed on the resonant cavity shell On the bottom plate of the resonant cavity shell, the compensation mirror is fixed to the bottom plate of the resonant cavity shell through an adapter.

Working principle of the present invention:

A high-frequency stable single-frequency dual-wavelength dual-pulse optical parametric oscillator laser is composed of a single-frequency dual-pulse train pump source, dual-wavelength seed switching injection, and combined with heterodyne beat frequency stabilization technology to separately control the output pulse frequency A single-frequency dual-wavelength, dual-pulse optical parametric oscillator laser realized by control. According to the principle of transmission intensity of the laser frequency through the resonator, the wavelength difference between the two selected implanted seeds must be an integer multiple of a free spectral range corresponding to the resonator. Once the first seed laser frequency is determined, the second seed laser frequency will be related to the cavity length and its fineness. Based on the high stability of the integrated resonant cavity, only the first wavelength pulse needs to be frequency-locked; after the first pulse is output, the piezoelectric ceramic drive circuit maintains the voltage after the first wavelength pulse until the second wavelength pulse passes through. constant, so as to keep the resonant cavity length of the optical parametric oscillator constant, and during the period between two pulses, the control signal makes the magneto-optical switch switch to enter the second wavelength seed laser into the resonant cavity, and the frequency of the second pulse is adjusted. Lock control.

Compared with the prior art, the present invention has the following advantages:

1. Using dual-wavelength seed injection to obtain single-frequency dual-wavelength dual-pulse laser, the dual-wavelength can be adjusted in a wide range according to needs.

2. The compensation sheet is inserted to improve the optical installation process of the resonator.

3. The relationship between the wavelength difference of the seed source required for multi-wavelength pulses and the resonant cavity length of the optical parametric oscillator is given to ensure stable multi-wavelength and multi-pulse output, and at the same time based on the high stability of the resonant cavity of the integrated optical parametric oscillator , a second pulse frequency control method is provided.

4. Experiments show that the present invention has the characteristics of narrow line width, high frequency stability, dual-wavelength dual-pulse single-frequency output, expandable wavelength, strong anti-interference ability, stable and reliable, and can further enhance the pulse energy by optical parameter amplification, which can be used in Atmospheric composition detection lidar laser light source can meet the application requirements of complex environments such as airborne and spaceborne.

Description of drawings

Fig. 1 is the structural block diagram of high frequency stability single-frequency dual-wavelength dual-pulse optical parametric oscillation laser of the present invention;

Fig. 2 is a schematic diagram of the pulse timing and wavelength of the pump laser and the parametric laser in the multi-wavelength narrow-linewidth pulse laser of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

As shown in Figure 1, Figure 1 is a structural block diagram of the high-frequency stability dual-wavelength dual-pulse optical parametric oscillator laser of the present invention, as can be seen from the figure, the dual-wavelength dual-pulse optical parametric oscillator laser of the present invention includes a single-frequency seed laser 1, high Stable optical parametric oscillator resonator 2, frequency control component 3 and single-frequency double-pulse train pump source 4 Four parts:

The single-frequency seed laser 1 includes: a first seed laser 101 and a second seed laser 102, a magneto-optical switch 103, a polarization-maintaining fiber beam splitter 104, a collimating mirror 105, an isolator 106, a focusing mirror 107, a first Half-wave plate 108 and dichroic mirror 109, the output end of described first seed laser 101 is connected with the input end of described polarization-maintaining fiber beam splitter 104, and described polarization-maintaining fiber beam splitter 104 is to described The laser beam output by the first seed laser 101 is split, the first output end of the polarization-maintaining fiber beam splitter 104 is connected to the first input end of the magneto-optical switch 103, and the second seed laser 102 The output end is connected to the second input end of the magneto-optical switch 103, and the seed laser light output by the output end of the magneto-optic switch 103 passes through the collimating mirror 105, the isolator 106, the focusing mirror 107, the first After the half-wave plate 108 and the dichroic mirror 109 enter the resonant cavity 2 of the high-stability optical parametric oscillator;

The high-stability optical parametric oscillator resonator 2 includes a high-stability resonator housing 200, a first cavity mirror 201, a second cavity mirror 202, a third cavity mirror 203, a fourth cavity mirror 204, and a compensation sheet 205 ), a nonlinear crystal 206, a thermoelectric cooling sheet 207, a piezoelectric ceramic sheet 2010, a first photodetector 2011 and a 45° reflector 2012 outside the cavity, and there are four cavities in the high-stability resonant cavity housing 200 Mirror, the transmission direction of the seed laser transmitted along the dichroic mirror 109 is the first cavity mirror 201, the second cavity mirror 202, the third cavity mirror 203 and the fourth cavity mirror 204, and finally through the first cavity mirror The mirror 201 and the external 45° reflector 2012 output, on the optical path between the first cavity mirror 201 and the second cavity mirror 202, there are the nonlinear crystal 206 and the thermoelectric cooling plate 207 thereof, the described The third cavity mirror 203 is fastened on the piezoelectric ceramic sheet 2010, the compensation sheet 205 is arranged between the third cavity mirror 203 and the fourth cavity mirror 204, and the fourth cavity mirror The first photodetector 2011 is arranged on the optical path extension line of 204;

The frequency control assembly 3 is composed of a second half-wave plate 301, a coupling mirror 302, a polarization-maintaining fiber-coupled acousto-optic modulator 303, a polarization-maintaining fiber coupler 304, a second photodetector 305, and a data acquisition and processing unit 306 in sequence. , a digital-to-analog conversion assembly 307 and a piezoelectric ceramic drive circuit 308; the second half-wave plate 301 is located in the transmission direction of the 45° mirror 2012 outside the cavity, and the first polarization-maintaining fiber coupler 304 Two input ends are connected with the second output end of described optical fiber beam splitter 104; The output end of described polarization-maintaining fiber coupler 304 is connected with the input end of described second photodetector 305, and described first The output end of two photodetectors 305 is connected with the first input end of described data acquisition processing unit 306; The circuit 308 is connected, and the output end of the piezoelectric ceramic driving circuit 308 is connected to the piezoelectric ceramic sheet 2010;

The single-frequency dual-pulse train pumping source 4 includes a single-frequency pulse train laser and its power supply electronic controller 401, a third half-wave plate 402 and a beam shrinker group 403, and the output of the single-frequency pulse train laser is fixed and repeats The pump laser light of the double-pulse train of frequency passes through the third half-wave plate 402 and the beam shrinking mirror group 403 sequentially, and then is reflected by the dichroic mirror 109 and enters the resonant cavity 2 of the high-stability optical parametric oscillator , the output terminal of the power supply electronic controller is connected to the control terminal of the magneto-optical switch 103, and provides a timing control signal for the magneto-optic switch 103, so as to define the relationship between the first seed laser 101 and the second seed laser 102. At the moment of switching, the output end of the power supply electronic controller is also connected to the second input end of the data collection processing unit 306 to provide a trigger signal to the data collection processing unit 306;

Under the control of the frequency control component 3, at the starting point of each working cycle, after the magneto-optical switch 103 receives a trigger signal, the laser light output by the first wavelength seed laser 101 passes through the magnetic The optical switch 103 is injected into the resonant cavity 2 of the high-stable optical parametric oscillator, and an initial voltage is applied to the piezoelectric ceramic sheet 2010, when the single-frequency pulse train output by the single-frequency pulse train laser is pumped The laser light is input into the resonant cavity 2 of the high-stability optical parametric oscillator through the dichroic mirror 109, and the resonant cavity 2 of the high-stability optical parametric oscillator obtains the parametric oscillation pulse train laser through the second half-wave Plate 301 and coupling mirror 302 output free-space laser, and the coupling mirror 302 couples the free-space laser into the polarization-maintaining fiber, and then passes through the described acousto-optic modulator 303 and polarization-maintaining fiber coupler 304, in the polarization-maintaining fiber Coupler 304, the first pulse in the parametric light pulse train and the other part of the first wavelength seed laser 101 output by the optical fiber beam splitter 104 perform beat frequency, which is recorded as beat frequency signal 1; while in the parametric light pulse Between the first pulse and the second pulse of the string, when the magneto-optical switch 103 receives the trigger signal provided by the electronic controller of the single-frequency dual-pulse train laser, the laser of the magneto-optic switch 103 switches to the second pulse The wavelength seed laser 102 is injected into the resonator 2 of the high-stability optical parametric oscillator to obtain the second pulse in the parametric optical pulse train;

The beat frequency signal 1 is collected and processed by the data acquisition and processing unit 306, and the frequency value of the beat frequency signal is compared with the reference modulation frequency. The amount of tuning is to apply a corresponding voltage to the piezoelectric ceramic sheet 2010 through the piezoelectric ceramic driving circuit 308, and tune the length of the resonant cavity, so that the first pulse frequency of the optical parametric oscillator is finally locked. On the frequency of the first seed laser 101; after the first pulse emits light, the voltage of the piezoelectric ceramic drive circuit 308 remains constant until the second pulse arrives, and the second pulse is controlled by the frequency of the second seed laser 102 pulse wavelength.

Example

The single-frequency seed laser 1 includes the first seed laser 101 and the second wavelength seed laser 102. The wavelengths of the two single-frequency seed lasers are 1572.024nm and 1572.085nm respectively. The resonant cavity 2 is an Invar material, and the nonlinear crystal 206 is Critically cut KTA crystal, the compensator 205 is fused silica glass. The optical fibers in the frequency control component 3 are all polarization-maintaining 1550nm optical fibers, the acousto-optic modulator 303 shifts frequency by 400MHz, the bandwidth of the second photodetector 305 is 5GHz, and the bandwidth of the data acquisition card is 1GHz.

The schematic diagram of the single-frequency Nd:YAG double-pulse train pumping source is shown in Figure 2, the repetition frequency is ~100Hz, the double-pulse interval is ~200μs, and the single-pulse energy is ~9mJ. At the same time, Figure 2 shows a schematic diagram of dual-wavelength dual-pulse output. The dual-wavelength pulse energy is ~2mJ, the first pulse wavelength is 1572.024nm, and the frequency stability is RMS ~0.3MHz. The second pulse wavelength is 1572.085nm and the frequency is stable. RMS ~ 0.3MHz, two pulse wavelength interval ~ 200μs, determined by the pump source, can be adjusted within a certain range.

Experiments show that the present invention has the characteristics of narrow line width, high frequency stability, dual-wavelength dual-pulse single-frequency output, expandable wavelength, strong anti-interference ability, stable and reliable, and can further increase the pulse energy by optical parameter amplification, and can be used for atmospheric components Detecting the laser light source of lidar can meet the application requirements of complex environments such as airborne and spaceborne.

Claims (4)

1. A single-frequency double-wavelength double-pulse optical parametric oscillator laser, characterized in that it comprises a single-frequency seed laser (1), a high-stability optical parametric oscillator resonator (2), a frequency control assembly (3) and a single-frequency double-pulse The series pump source (4) has four parts: The single-frequency seed laser (1) includes: a first seed laser (101) and a second seed laser (102), a magneto-optical switch (103), a polarization-maintaining fiber beam splitter (104), a collimating mirror (105 ), an isolator (106), a focusing mirror (107), a first half-wave plate (108) and a dichroic mirror (109), the output end of the first seed laser (101) is separated from the polarization-maintaining fiber The input end of the beamer (104) is connected, and the described polarization-maintaining fiber beam splitter (104) splits the laser light output by the first seed laser (101), and the described polarization-maintaining fiber beam splitter ( 104) the first output terminal is connected with the first input terminal of the magneto-optical switch (103), the second seed laser (102) output terminal is connected with the second input terminal of the magneto-optical switch (103) The output terminal of the magneto-optical switch (103) outputs the seed laser light through the collimator mirror (105), the isolator (106), the focusing mirror (107), and the first half-wave plate (108) successively. and the dichroic mirror (109) enter the resonant cavity (2) of the high-stability optical parametric oscillator; The high-stability optical parametric oscillator resonator (2) includes a high-stability resonator housing (200), a first cavity mirror (201), a second cavity mirror (202), and a third cavity mirror (203) , the fourth cavity mirror (204), the compensation sheet (205), the nonlinear crystal (206), the thermoelectric cooling sheet (207), the piezoelectric ceramic sheet (2010), the first photodetector (2011) and the 45° outside the cavity Mirrors (2012), there are four cavity mirrors in the high-stability resonant cavity housing (200), and the transmission direction of the seed laser transmitted along the dichroic mirror (109) is the first cavity in turn mirror (201), the second cavity mirror (202), the third cavity mirror (203) and the fourth cavity mirror (204), and finally output through the first cavity mirror (201) and the external 45° mirror (2012) , there is the nonlinear crystal (206) on the optical path between the first cavity mirror (201) and the second cavity mirror (202) and placed in the thermoelectric cooling chip (207), so The third cavity mirror (203) is fastened on the piezoelectric ceramic sheet (2010), and the compensation sheet is arranged between the third cavity mirror (203) and the fourth cavity mirror (204) (205), arranging the first photodetector (2011) on the extension line of the optical path of the fourth cavity mirror (204); The frequency control assembly (3) consists of a second half-wave plate (301), a coupling mirror (302), an acousto-optic modulator (303), a polarization-maintaining fiber coupler (304), a second photodetector ( 305), a data acquisition and processing unit (306), a digital-to-analog conversion assembly (307) and a piezoelectric ceramic drive circuit (308); the second half-wave plate (301) is located at the 45° reflector outside the cavity (2012) transmission direction, the second input end of described polarization-maintaining fiber coupler (304) is connected with the second output end of described fiber beam splitter (104); Described polarization-maintaining fiber coupler ( 304) output end is connected with the input end of described second photodetector (305), and the output end of described second photodetector (305) is connected with the first of described data acquisition and processing unit (306). The input end is connected; the output end of the data acquisition processing unit (306) is connected with the described piezoelectric ceramic driving circuit (308) through the described digital-to-analog conversion assembly (307), and the piezoelectric ceramic driving circuit (308) is The output end is connected to the piezoelectric ceramic sheet (2010); The single-frequency dual-pulse train pumping source (4) includes a single-frequency pulse train laser and its electronic controller (401), a third half-wave plate (402) and a beam reducer group (403). The double-pulse train pumping laser with a fixed repetition rate output by the high-frequency pulse train laser passes through the third half-wave plate (402) and the beam shrinker group (403) in turn, is reflected by the dichroic mirror (109) and enters the A high stability optical parametric oscillator resonant cavity (2), the output terminal of the electronic controller is connected to the control terminal of the magneto-optical switch (103) to provide timing for the magneto-optic switch (103) Control signal, to determine the switching moment of the wavelength of the first seed laser (101) and the second seed laser (102), the output end of the electronic controller is also connected with the second input end of the data acquisition and processing unit (306) connected to provide a trigger signal to the data acquisition processing unit (306); Under the control of the frequency control component (3), at the starting point of each working cycle, after the magneto-optical switch (103) receives a trigger signal, the first wavelength seed laser (101) outputs The laser light is injected into the resonant cavity (2) of the high-stable optical parametric oscillator (2) through the magneto-optic opening (103), and an initial voltage is applied to the piezoelectric ceramic sheet (2010), when the single-frequency pulse The single-frequency double-pulse train pumping laser output by the string laser is input into the high-stability optical parametric oscillator resonator (2) through the described dichroic mirror (109), and the high-stability optical parametric oscillator resonates The cavity (2) obtains the parametric oscillation pulse train laser to output the free-space laser through the second half-wave plate (301) and the coupling mirror (302), and the described coupling mirror (302) couples the free-space laser into the polarization-maintaining fiber , and then through the acousto-optic modulator (303) and the polarization-maintaining fiber coupler (304), in the polarization-maintaining fiber coupler (304), the first pulse in the parametric optical pulse train is split with the optical fiber Another part of the first wavelength seed laser (101) output by the beamer (104) is beat frequency, which is recorded as beat frequency signal 1; and between the first pulse and the second pulse of the parametric optical pulse train, the When the magneto-optical laser (103) receives the trigger signal provided by the single-frequency double-pulse laser electronics (401), the laser of the magneto-optical laser (103) is switched to the second wavelength seed laser (102) and injected into the The resonant cavity (2) of the high-stability optical parametric oscillator obtains the second pulse in the parametric optical pulse train; the beat frequency signal 1 is collected and processed by the data acquisition and processing unit (306) The frequency value of the beat frequency signal is compared with the reference modulation frequency, and the difference is obtained by the digital-to-analog conversion component (307) to obtain the corresponding resonant cavity length tuning value, which is given to the described piezoelectric ceramic drive circuit (308) The piezoelectric ceramic sheet (2010) applies a corresponding voltage to tune the length of the resonant cavity, finally satisfying that the first pulse frequency of the optical parametric oscillator is locked on the frequency of the first seed laser (101); in the first After the first pulse emits light, the voltage of the piezoelectric ceramic driving circuit (308) remains unchanged until the second pulse arrives, and the frequency of the second seed laser (102) controls the second pulse wavelength. 2. The high-frequency stable single-frequency dual-wavelength dual-pulse optical parametric oscillator laser according to claim 1, characterized in that the covered bands of the first seed laser (101) and the second seed laser (102) include But not limited to 2 μm, 1.57 μm, 1.64 μm, 0.97 μm and 0.94 μm, and the wavelength difference between the second seed laser (102) and the first seed laser (101) is that of the optical parametric oscillator resonator (2) Integer multiples of the free spectral range. 3. The single-frequency double-wavelength double-pulse optical parametric oscillation laser according to claim 1, wherein the pumping pulse train output by the single-frequency pulse train laser is a single-wavelength double pulse train, and the pulse train in the pulse train is The interval is adjusted within a certain range by the electronic controller as required; the parametric light pulse train formed by the seed laser is a pulse train with two wavelengths, and its wavelength is respectively the same as that of the first seed laser (101) and the second seed laser The laser (102) is consistent, and the pulse interval is consistent with the interval of the pump pulse train. 4. The single-frequency, dual-wavelength, and dual-pulse optical parametric oscillator laser according to claim 1, wherein the resonant cavity housing (200) of the high-stability optical parametric oscillator is processed from an integrated structure, and the The first cavity mirror (201) and the second cavity mirror (202) are directly fixed on the vertical wall of the housing (200), and the third cavity mirror (203) and the fourth cavity mirror (204) are rotated The connector is fixed on the vertical wall of the high-stability resonant cavity shell (200), the nonlinear crystal (206) is placed in the heat sink metal block, and the temperature can be adjusted, and the metal block is fixed on the resonant cavity shell (200) On the bottom plate of the resonant cavity housing (200), the compensating mirror (205) is fixed to the bottom plate of the resonant cavity shell (200) through an adapter.

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