CN115663581A - Single-frequency dual-wavelength double-pulse optical parametric oscillation laser - Google Patents
Single-frequency dual-wavelength double-pulse optical parametric oscillation laser Download PDFInfo
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Abstract
A high-frequency stability single-frequency double-pulse optical parametric oscillation laser comprises a single-frequency seed laser, a high-stability optical parametric oscillator resonant cavity, a frequency control assembly and a single-frequency double-pulse-train pumping source. The invention has the characteristics of narrow line width, high frequency stability, dual-wavelength double-pulse single-frequency output, expandable wavelength, strong anti-interference capability, stability and reliability, can further amplify optical parameters to improve pulse energy, can be used for an atmospheric component detection laser radar laser light source, and can meet the application requirements of airborne complex environments, satellite borne complex environments and the like.
Description
Technical Field
The invention relates to a pulse optical parametric oscillation laser, in particular to a single-frequency dual-wavelength double-pulse optical parametric oscillation laser.
Technical Field
An airborne and spaceborne integral path differential absorption radar system is an effective remote sensing device for measuring polluted gases such as water vapor, carbon dioxide, methane and the like in the atmosphere, and is a current focus of the research on the carbon cycle of the earth. The most important of radars is a single-frequency pulse laser source, which requires both high pulse energy and high frequency stability, and also requires multiple wavelength output. Therefore, the multi-wavelength single-frequency pulse laser with reliable performance has practical significance.
The laser for the current laser differential absorption radar is a research hotspot, and the following problems can be encountered in the implementation process of the seed injection single-frequency single-pulse optical parametric oscillator.
Firstly, injecting seed laser into a resonant cavity, finely adjusting a four-cavity mirror to enable the seeds to be transmitted in the resonant cavity for multiple times, and representing the completion of the debugging of the resonant cavity by using the fineness of laser interference signals transmitted by the seeds through the resonant cavity; and then, placing a nonlinear crystal, and adjusting the angle to meet the requirement of the central wavelength of the pulse output spectrum. Due to the individual difference of the crystal, the transmission interference signal of the seed laser can be changed, and the cavity mirror can not be adjusted.
Secondly, in order to realize high output frequency stability of parametric light pulse, namely jitter of a laser pulse frequency value is 1MHz magnitude, a frequency control assembly is required to generate small step length to adjust the cavity length, a high-precision control assembly is required, and ripples of a PZT driving circuit are controlled, which brings challenges to long-term reliable operation of electronics.
Thirdly, the prior method can only realize the output of the optical parametric oscillation laser with single wavelength, and the output pulse frequency needs to be controlled by adopting a novel method for selecting the frequency of the second seed laser of the single-frequency dual-wavelength double-pulse optical parametric oscillator.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a single-frequency dual-wavelength double-pulse optical parametric oscillation laser which is simple in optical calibration, ensures high reliability while reducing the precision requirement on a frequency stabilizing component, and provides a basis for selecting the frequency of a second seed laser and a frequency stabilizing method for a second pulse laser.
The technical solution of the invention is as follows:
the utility model provides a single-frequency dual wavelength dipulse optical parametric oscillation laser, is characterized in that includes single-frequency seed laser, high stability optical parametric oscillator resonant cavity, frequency control subassembly and single-frequency dipulse train pumping source four bibliographic categories branch:
the single frequency seed laser includes: the output end of the first seed laser is connected with the input end of the polarization-maintaining optical fiber beam splitter, the polarization-maintaining optical fiber beam splitter splits the laser output by the first seed laser, the first output end of the polarization-maintaining optical fiber beam splitter is connected with the first input end of the magneto-optical switch, the output end of the second seed laser is connected with the second input end of the magneto-optical switch, and the seed laser output by the output end of the magneto-optical switch sequentially passes through the collimating mirror, the isolator, the focusing mirror, the first half-wave plate and the dichroic mirror and then enters the resonant cavity of the high-stability optical parametric oscillator;
the high-stability optical parametric oscillator resonant cavity comprises a high-stability resonant cavity shell, a first cavity mirror, a second cavity mirror, a third cavity mirror, a fourth cavity mirror, a compensating plate, a nonlinear crystal, a thermoelectric refrigeration piece, a piezoelectric ceramic piece, a first photoelectric detector and an extra-cavity 45-degree reflector, wherein four cavity mirrors are arranged in the high-stability resonant cavity shell, the first cavity mirror, the second cavity mirror, the third cavity mirror and the fourth cavity mirror are sequentially arranged along the transmission direction of seed laser transmitted by the dichroic mirror, and are finally output through the first cavity mirror and the extra-cavity 45-degree reflector, the nonlinear crystal is arranged on a light path between the first cavity mirror and the second cavity mirror and is placed in the thermoelectric refrigeration piece, the third cavity mirror is fastened on the piezoelectric ceramic piece, the compensating plate is arranged between the third cavity mirror and the fourth cavity mirror, and the first photoelectric detector is arranged on a light path extension line of the fourth cavity mirror;
the frequency control assembly consists of a second half-wave plate, a coupling mirror, an acousto-optic modulator, a polarization maintaining optical fiber coupler, a second photoelectric detector, a data acquisition and processing unit, a digital-to-analog conversion assembly and a piezoelectric ceramic drive circuit in sequence; the second half-wave plate is positioned in the transmission direction of the 45-degree reflector outside the cavity, and the second input end of the polarization-maintaining optical fiber coupler is connected with the second output end of the optical fiber beam splitter; the output end of the polarization-maintaining fiber coupler is connected with the input end of the second photoelectric detector, and the output end of the second photoelectric detector is connected with the first input end of the data acquisition and processing unit; the output end of the data acquisition and processing unit is connected with the piezoelectric ceramic driving circuit through the digital-to-analog conversion component, and the output end of the piezoelectric ceramic driving circuit is connected with the piezoelectric ceramic piece;
the single-frequency double-pulse-train pumping source comprises a single-frequency pulse train laser and an electronic controller, a third half-wave plate and a beam reduction mirror group thereof, the single-frequency pulse train laser outputs double-pulse-train pumping laser with fixed repetition frequency, the pumping laser sequentially passes through the third half-wave plate and the beam reduction mirror group and is reflected by the dichroic mirror to enter the resonant cavity of the high-stability optical parametric oscillator, the output end of the electronic controller is connected with the control end of the magneto-optical switch to provide a time sequence control signal for the magneto-optical switch so as to determine the switching time of the wavelengths of the first seed laser and the second seed laser, and the output end of the electronic controller is also connected with the second input end of the data acquisition and processing unit to provide a trigger signal for the data acquisition and processing unit;
under the control of the frequency control component, at the starting point of each working cycle, after receiving a trigger signal, the magneto-optical switch injects the laser output by the first wavelength seed laser into the high-stability optical parametric oscillator resonant cavity through the magneto-optical switch, and applies an initial voltage to the piezoelectric ceramic chip, when the pump laser of a single-frequency double-pulse train output by the single-frequency pulse train laser is input into the high-stability optical parametric oscillator resonant cavity through the dichroic mirror, the high-stability optical parametric oscillator resonant cavity obtains a parametric oscillation pulse train laser and outputs a free space laser through the second half-wave plate and the coupling mirror, the coupling mirror couples the free space laser into a polarization maintaining optical fiber, and then the free space laser is subjected to beat frequency through the acousto-optical modulator and the polarization maintaining optical fiber coupler, and in the polarization maintaining optical fiber coupler, a first pulse in the optical pulse train and the other part of the first wavelength seed laser output by the optical fiber beam splitter are marked as a beat frequency signal 1; between the first pulse and the second pulse of the parametric optical pulse train, when the magneto-optical switch receives a trigger signal provided by single-frequency double-pulse series laser electronics, the laser of the magneto-optical switch is switched into seed laser with a second wavelength and is injected into the resonant cavity of the high-stability optical parametric oscillator to obtain the second pulse of the parametric optical pulse train; the beat frequency signal 1 is obtained by the data acquisition and processing unit, the frequency value of the beat frequency signal is obtained by processing, the difference value is compared with the reference modulation frequency, the difference value is subjected to digital-to-analog conversion to obtain the corresponding resonant cavity length tuning amount, corresponding voltage is applied to the piezoelectric ceramic piece through the piezoelectric ceramic driving circuit to tune the resonant cavity length, and finally the first pulse frequency of the optical parametric oscillator is locked on the frequency of the first seed laser; after the first pulse emits light, the voltage of the piezoelectric ceramic driving circuit keeps unchanged until the second pulse arrives, and the frequency of the second seed laser controls the wavelength of the second pulse.
The covered wave bands of 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 integral multiple of the free spectral range of the optical parametric oscillator resonant cavity.
The pumping pulse train output by the single-frequency pulse train laser is a single-wavelength double-pulse train, and the interval between pulses in the pulse train is adjusted in a certain range by the electronic controller according to requirements; the parametric optical pulse train formed by the seed laser is a pulse train with double wavelengths, the wavelengths of the parametric optical pulse train are respectively consistent with the first seed laser and the second seed laser, and the pulse interval is consistent with the interval of the pumping pulse train.
The high-stability optical parametric oscillator resonant cavity shell is processed into an integrated structure, the first cavity mirror and the second cavity mirror are directly fixed on the vertical wall of the shell, the third cavity mirror and the fourth cavity mirror are fixed on the vertical wall of the high-stability resonant cavity shell through the adapter, the nonlinear crystal is arranged in the heat sink metal block, the temperature is adjustable, the metal block is fixed on the bottom plate of the resonant cavity shell, and the compensating mirror is fixed on the bottom plate of the resonant cavity shell through the adapter.
The working principle of the invention is as follows:
a single-frequency dual-wavelength double-pulse optical parametric oscillation laser with high frequency stability is a single-frequency dual-wavelength double-pulse optical parametric oscillation laser which is realized by a single-frequency dual-pulse string pump source, dual-wavelength seed switching injection and combination of a heterodyne beat frequency method frequency stabilization technology to control output pulse frequency respectively. According to the principle that the laser frequency is transmitted through the resonant cavity, the wavelength difference of the two selected injection seeds is required to be integral multiple of a free spectral range corresponding to the resonant cavity. Once the first seed laser frequency is determined, the second seed laser frequency will be related to the resonator cavity length and its finesse. Based on the high stability of the integrated resonant cavity, the frequency locking control is only needed to be carried out on the first wavelength pulse; after the first pulse is output, the voltage of the piezoelectric ceramic driving circuit is kept unchanged after the first wavelength pulse is output until the second wavelength pulse passes through a time interval, so that the length of a resonant cavity of the optical parametric oscillator is kept unchanged, and in the time interval between the two pulses, the control signal enables the magneto-optical switch to enable the second wavelength seed laser to enter the resonant cavity, and the frequency of the second pulse is locked and controlled.
Compared with the prior art, the invention has the following advantages:
1. the single-frequency dual-wavelength dual-pulse laser is obtained by injecting dual-wavelength seeds, and the dual-wavelength can be adjusted in a large range according to needs.
2. And a compensating plate is arranged, so that the optical installation process of the resonant cavity is improved.
3. The relation between the wavelength difference of the seed source required by the multi-wavelength pulse and the length of the resonant cavity of the optical parametric oscillator is given, stable multi-wavelength multi-pulse output is ensured to be obtained, and meanwhile, a second pulse frequency control method is provided based on the high stability of the resonant cavity of the integrated optical parametric oscillator.
4. Experiments show that the laser has the characteristics of narrow line width, high frequency stability, dual-wavelength double-pulse single-frequency output, expandable wavelength, strong anti-interference capability, stability and reliability, can further amplify optical parameters to improve pulse energy, can be used for an atmospheric component detection laser radar laser light source, and can meet the application requirements of complex environments such as airborne environment, satellite borne environment and the like.
Drawings
FIG. 1 is a block diagram of the structure of a high frequency stable single frequency dual wavelength double pulse optical parametric oscillation laser of the present invention;
FIG. 2 is a schematic diagram of timing and wavelength of pump laser and parametric laser pulses in the multi-wavelength narrow linewidth pulse laser of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention should not be limited thereto.
As shown in fig. 1, fig. 1 is a structural block diagram of a high-frequency-stability dual-wavelength dual-pulse optical parametric oscillation laser, and it can be seen from the figure that the dual-wavelength dual-pulse optical parametric oscillation laser of the present invention includes four parts, namely, a single-frequency seed laser 1, a high-stability optical parametric oscillator resonant cavity 2, a frequency control component 3, and a single-frequency dual-pulse string pump source 4:
the single-frequency seed laser 1 includes: a first seed laser 101, 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, wherein an output end of the first seed laser 101 is connected with an input end of the polarization-maintaining fiber beam splitter 104, the polarization-maintaining fiber beam splitter 104 splits laser light output by the first seed laser 101, a first output end of the polarization-maintaining fiber beam splitter 104 is connected with a first input end of the magneto-optical switch 103, an output end of the second seed laser 102 is connected with a second input end of the magneto-optical switch 103, and seed laser light output by an output end of the magneto-optical switch 103 sequentially passes through the collimating mirror 105, the isolator 106, the focusing mirror 107, the first half-wave plate 108 and the dichroic mirror 109 and then enters the high-stability parametric optical oscillator resonant cavity 2;
the high-stability optical parametric oscillator resonant cavity 2 comprises a high-stability resonant cavity shell 200, a first cavity mirror 201, a second cavity mirror 202, a third cavity mirror 203, a fourth cavity mirror 204, a compensating plate 205), a nonlinear crystal 206, a thermoelectric refrigerating plate 207, a piezoelectric ceramic plate 2010, a first photoelectric detector 2011 and an extra-cavity 45-degree reflecting mirror 2012, wherein four cavity mirrors are arranged in the high-stability resonant cavity shell 200, the first cavity mirror 201, the second cavity mirror 202, the third cavity mirror 203 and the fourth cavity mirror 204 are sequentially arranged along the transmission direction of seed laser transmitted by the dichroic mirror 109, and finally the seed laser is output through the first cavity mirror 201 and the extra-cavity 45-degree reflecting mirror 2012, the nonlinear crystal 206 and the thermoelectric refrigerating plate 207 thereof are arranged on a light path between the first cavity mirror 201 and the second cavity mirror 202, the third cavity mirror 203 is fastened on the piezoelectric ceramic plate 2010, the compensating plate 205 is arranged between the third cavity mirror 203 and the fourth cavity mirror 204, and a first photoelectric detector 2011 is arranged on a light path of the fourth cavity mirror 204;
the frequency control component 3 is composed of a second half-wave plate 301, a coupling mirror 302, a polarization maintaining fiber coupling acousto-optic modulator 303, a polarization maintaining fiber coupler 304, a second photoelectric detector 305, a data acquisition processing unit 306, a digital-to-analog conversion component 307 and a piezoelectric ceramic drive circuit 308 in sequence; the second half-wave plate 301 is located in the transmission direction of the 45 ° mirror 2012 outside the cavity, and a second input end of the polarization-maintaining fiber coupler 304 is connected to a second output end of the fiber splitter 104; the output end of the polarization maintaining fiber coupler 304 is connected to the input end of the second photodetector 305, and the output end of the second photodetector 305 is connected to the first input end of the data acquisition processing unit 306; the output end of the data acquisition processing unit 306 is connected with the piezoelectric ceramic driving circuit 308 through the digital-to-analog conversion component 307, and the output end of the piezoelectric ceramic driving circuit 308 is connected with the piezoelectric ceramic piece 2010;
the single-frequency double-pulse-train pumping source 4 comprises a single-frequency pulse train laser and a power supply electronic controller 401, a third half-wave plate 402 and a beam reduction mirror group 403 thereof, the single-frequency pulse train laser outputs double-pulse-train pumping laser with fixed repetition frequency, the pumping laser sequentially passes through the third half-wave plate 402 and the beam reduction mirror group 403 and then is reflected by the dichroic mirror 109 to enter the high-stability optical parametric oscillator resonant cavity 2, the output end of the power supply electronic controller is connected with the control end of the magneto-optical switch 103 to provide a time sequence control signal for the magneto-optical switch 103, the switching time of the first seed laser 101 and the second seed laser 102 is determined, and the output end of the power supply electronic controller is further connected with the second input end of the data acquisition processing unit 306 to provide a trigger signal for the data acquisition processing unit 306;
under the control of the frequency control component 3, at the start point of each working cycle, after the magneto-optical switch 103 receives a trigger signal, the laser output by the first wavelength seed laser 101 is injected into the high-stability optical parametric oscillator resonant cavity 2 through the magneto-optical switch 103, and an initial voltage is applied to the piezoelectric ceramic wafer 2010, when the pump laser of a single-frequency double-pulse train output by the single-frequency pulse train laser is input into the high-stability optical parametric oscillator resonant cavity 2 through the dichroic mirror 109, the high-stability optical parametric oscillator resonant cavity 2 obtains a parametric oscillation pulse train laser, and the parametric oscillation pulse train laser outputs a free space laser through the second half-wave plate 301 and the coupling mirror 302, the coupling mirror 302 couples the free space laser into a polarization maintaining fiber, and then passes through the acousto-optic modulator 303 and the polarization maintaining fiber coupler 304, and in the polarization maintaining fiber coupler 304, the first pulse in the parametric oscillation train and the other part of the first wavelength seed laser 101 output by the fiber beam splitter 104 perform beat frequency calculation to obtain a beat signal 1; between the first pulse and the second pulse of the parametric optical pulse train, when the magneto-optical switch 103 receives a trigger signal provided by the single-frequency double-pulse-train laser electronic controller, the laser of the magneto-optical switch 103 is switched to a second wavelength seed laser 102 and injected into the high-stability optical parametric oscillator resonant cavity 2 to obtain the second pulse of the parametric optical pulse train;
the beat frequency signal 1 is obtained by acquiring and processing the beat frequency signal frequency value acquired by the data acquisition and processing unit 306, and is compared with the reference modulation frequency, the difference value is subjected to digital-to-analog conversion 307 to obtain the corresponding resonant cavity length tuning amount, corresponding voltage is applied to the piezoelectric ceramic piece 2010 through the piezoelectric ceramic driving circuit 308 to tune the resonant cavity length, and finally the first pulse frequency of the optical parametric oscillator is locked on the frequency of the first seed laser 101; after the light is emitted from the first pulse, the voltage of the piezo-ceramic driving circuit 308 remains unchanged until the second pulse arrives, and the frequency of the second seed laser 102 controls the wavelength of the second pulse.
Examples
The single-frequency seed laser 1 comprises a first seed laser 101 and a second seed laser 102, wherein the wavelengths of the two single-frequency seed lasers are 1572.024nm and 1572.085nm respectively, a resonant cavity 2 is made of invar material, a nonlinear crystal 206 is a critical cutting KTA crystal, and a compensating plate 205 is fused quartz glass. In the frequency control component 3, the optical fibers are all polarization maintaining 1550nm optical fibers, the frequency shift of the acousto-optic modulator 303 is 400MHz, the bandwidth of the second photoelectric detector 305 is 5GHz, and the bandwidth of the data acquisition card is 1GHz.
A single-frequency Nd-YAG double-pulse-train pumping source is shown in figure 2, the repetition frequency is 100Hz, the double-pulse interval is 200 mus, and the single-pulse energy is 9mJ. Meanwhile, fig. 2 shows a schematic diagram of dual-wavelength dual-pulse output, wherein the pulse energy of the dual-wavelength dual-pulse output is 2mJ, the first pulse wavelength is 1572.024nm, the frequency stability is RMS-0.3 MHz, the second pulse wavelength is 1572.085nm, the frequency stability is RMS-0.3 MHz, the wavelength interval of the two pulses is 200 mus, and the dual-wavelength dual-pulse output can be adjusted within a certain range determined by a pumping source.
Experiments show that the laser has the characteristics of narrow line width, high frequency stability, dual-wavelength double-pulse single-frequency output, expandable wavelength, strong anti-interference capability, stability and reliability, can further amplify optical parameters to improve pulse energy, can be used for an atmospheric component detection laser radar laser light source, and can meet the application requirements of complex environments such as airborne environment, satellite borne environment and the like.
Claims (4)
1. The utility model provides a two pulse optical parameter oscillation laser of single-frequency dual wavelength, characterized in that includes single-frequency seed laser (1), high stability optical parameter oscillator resonant cavity (2), frequency control subassembly (3) and single-frequency double pulse train pumping source (4) four bibliographic categories branch:
the single frequency seed laser (1) comprises: the high-stability optical parameter oscillator comprises a first seed laser (101), a second seed laser (102), a magneto-optical switch (103), a polarization-maintaining optical 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), wherein the output end of the first seed laser (101) is connected with the input end of the polarization-maintaining optical fiber beam splitter (104), the polarization-maintaining optical fiber beam splitter (104) splits laser output by the first seed laser (101), the first output end of the polarization-maintaining optical fiber beam splitter (104) is connected with the first input end of the magneto-optical switch (103), the output end of the second seed laser (102) is connected with the second input end of the magneto-optical switch (103), and seed laser output by the output end of the magneto-optical switch (103) enters the high-stability optical parameter oscillator (2) of the dichroic mirror (109) sequentially through the collimating mirror (105), the isolator (106), the focusing mirror (107), the first half-wave plate (108) and the dichroic mirror (109);
the high-stability optical parametric oscillator resonant cavity (2) comprises a high-stability resonant cavity shell (200), a first cavity mirror (201), a second cavity mirror (202), a third cavity mirror (203), a fourth cavity mirror (204), a compensating plate (205), a nonlinear crystal (206), a thermoelectric cooling plate (207), a piezoelectric ceramic plate (2010), a first photoelectric detector (2011) and an extra-cavity 45-degree reflecting mirror (2012), wherein four cavity mirrors are arranged in the high-stability resonant cavity shell (200), the first cavity mirror (201), the second cavity mirror (202), the third cavity mirror (203) and the fourth cavity mirror (204) are sequentially arranged along the transmission direction of seed laser transmitted by the dichroic mirror (109), and finally the seed laser is output through the first cavity mirror (201) and the extra-cavity 45-degree reflecting mirror (2012), the nonlinear crystal (206) is arranged on a light path between the first cavity mirror (201) and the second cavity mirror (202) and is arranged in the thermoelectric cooling plate (207), the third cavity mirror (203) is fastened on the optical path of the fourth cavity mirror (2011) of the piezoelectric resonator (201), and the compensating plate (205) is arranged on the optical path of the fourth cavity mirror (2010), and the piezoelectric ceramic plate (204), and the compensating plate (2010) is arranged on the fourth cavity mirror (2010) and the compensating plate (205);
the frequency control assembly (3) is composed of a second half-wave plate (301), a coupling mirror (302), an acousto-optic modulator (303), a polarization-maintaining optical fiber coupler (304), a second photoelectric detector (305), a data acquisition processing unit (306), a digital-to-analog conversion assembly (307) and a piezoelectric ceramic drive circuit (308) in sequence; the second half-wave plate (301) is located in the transmission direction of the 45-degree reflector (2012) outside the cavity, and a second input end of the polarization-maintaining fiber coupler (304) is connected with a second output end of the fiber beam splitter (104); the output end of the polarization-maintaining fiber coupler (304) is connected with the input end of the second photoelectric detector (305), and the output end of the second photoelectric detector (305) is connected with the first input end of the data acquisition processing unit (306); the output end of the data acquisition processing unit (306) is connected with the piezoelectric ceramic driving circuit (308) through the digital-to-analog conversion component (307), and the output end of the piezoelectric ceramic driving circuit (308) is connected with the piezoelectric ceramic piece (2010);
the single-frequency double-pulse-train pumping source (4) comprises a single-frequency pulse train laser and an electronic controller (401) thereof, a third half-wave plate (402) and a beam-reducing mirror group (403), the single-frequency pulse train laser outputs pumping laser of double-pulse trains with fixed repetition frequency, the pumping laser sequentially passes through the third half-wave plate (402) and the beam-reducing mirror group (403) and is reflected by the dichroic mirror (109) to enter the high-stability optical parametric oscillator resonant cavity (2), the output end of the electronic controller is connected with the control end of the magneto-optical switch (103) to provide a time sequence control signal for the magneto-optical switch (103) so as to determine the switching time of the wavelengths of the first seed laser (101) and the second seed laser (102), and the output end of the electronic controller is also connected with the second input end of the data acquisition and processing unit (306) to provide a trigger signal for the data acquisition and processing unit (306);
under the control of the frequency control assembly (3), at the start point of each working cycle, after receiving a trigger signal, the magneto-optical switch (103) injects laser output by the first wavelength seed laser (101) into the high-stability optical parametric oscillator resonant cavity (2) through the magneto-optical switch (103), and applies an initial voltage to the piezoelectric ceramic plate (2010), when pump laser of a single-frequency double-pulse train output by the single-frequency pulse train laser is input into the high-stability optical parametric oscillator resonant cavity (2) through the dichroic mirror (109), the high-stability optical parametric oscillator resonant cavity (2) obtains parametric oscillation pulse train laser and outputs free space laser through the second half-wave plate (301) and the coupling mirror (302), the coupling mirror (302) couples the free space laser into a polarization-preserving fiber, and then the acousto-optic modulator (303) and the polarization-preserving fiber coupler (304) are used for recording a beat signal of the first pulse in the parametric oscillation pulse train and the beat first pulse (104) output by the first half-wave plate (301) as another beat signal of the beat frequency seed laser (101); between a first pulse and a second pulse of the parametric optical pulse train, when the magneto-optical switch (103) receives a trigger signal provided by single-frequency double-pulse series laser electronics (401), laser of the magneto-optical switch (103) is switched to seed laser (102) with a second wavelength and is injected into the high-stability optical parametric oscillator resonant cavity (2), and the second pulse of the parametric optical pulse train is obtained; the beat frequency signal 1 is obtained by acquiring and processing the beat frequency signal frequency value acquired and processed by the data acquisition and processing unit (306), the beat frequency signal frequency value is compared with a reference modulation frequency, the difference value is subjected to digital-to-analog conversion component (307) to obtain a corresponding resonant cavity length tuning amount, corresponding voltage is applied to the piezoelectric ceramic piece (2010) through the piezoelectric ceramic driving circuit (308), the resonant cavity length is tuned, and finally the first pulse frequency of the optical parametric oscillator is locked on the frequency of the first seed laser (101); after the light is emitted from the first pulse, the voltage of the piezoelectric ceramic driving circuit (308) is kept unchanged until the second pulse arrives, and the wavelength of the second pulse is controlled by the frequency of the second seed laser (102).
2. The high frequency stable single-frequency dual-wavelength dual-pulse photoparametric oscillation laser as claimed in claim 1 characterized in that the covered wavelength bands of said first seed laser (101) and said second seed laser (102) include but are not limited to 2 μ ι η, 1.57 μ ι η, 1.64 μ ι η, 0.97 μ ι η and 0.94 μ ι η, and the wavelength difference of the second seed laser (102) and the first seed laser (101) is an integer multiple of the free spectral range of said optical parametric oscillator cavity (2).
3. The single-frequency dual-wavelength double-pulse optical parametric oscillation laser device as claimed in claim 1, wherein the pumping pulse train output by the single-frequency pulse train laser device is a single-wavelength double-pulse train, and the interval between pulses in the pulse train is adjusted within a certain range by the electronic controller as required; the parametric optical pulse train formed by the seed laser is a pulse train with double wavelengths, the wavelengths of the parametric optical pulse train are respectively consistent with the first seed laser (101) and the second seed laser (102), and the pulse interval is consistent with the interval of the pumping pulse train.
4. The single-frequency dual-wavelength dipulse photoparametric oscillation laser of claim 1, characterized in that said high stability photoparametric oscillator resonator housing (200) is machined as a unitary structure, said first cavity mirror (201) and second cavity mirror (202) are directly fixed on the vertical wall of the housing (200), said third cavity mirror (203), fourth cavity mirror (204) are fixed on the vertical wall of the high stability resonator housing (200) through an adapter, the nonlinear crystal (206) is placed in a heat sink metal block, the temperature is tunable, the metal block is fixed on the bottom plate of the resonator housing (200), the compensating mirror (205) is fixed on the bottom plate of the resonator housing (200) through an adapter.
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| CN116387959A (en) * | 2023-03-27 | 2023-07-04 | 中国科学院上海光学精密机械研究所 | Frequency stabilizing device and method for single-frequency double-pulse double-wavelength laser |
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