CN114709707B - High-power sum frequency laser generation method and system and phase modulation method thereof - Google Patents

High-power sum frequency laser generation method and system and phase modulation method thereof Download PDF

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CN114709707B
CN114709707B CN202210612145.1A CN202210612145A CN114709707B CN 114709707 B CN114709707 B CN 114709707B CN 202210612145 A CN202210612145 A CN 202210612145A CN 114709707 B CN114709707 B CN 114709707B
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CN114709707A (en
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冯衍
曾鑫
林治全
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Hangzhou Phase Laser Technology Co ltd
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Hangzhou Institute of Advanced Studies of UCAS
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Abstract

本发明的一种高功率和频激光产生方法、及系统及其相位调制方法，将两个单频激光器输出两个单频种子激光，采用两个驱动信号分别对两个单频激光进行相位调制，相位调制同时对两个种子激光施加幅值相等、符号相反的任意信号，使得两个单频激光线宽展宽并让两束激光进入激光放大器，同时进一步调节两个信号间的延迟，通过非线性晶体和频得到单频激光输出。本发明具有波长范围广、结构简单紧凑、设计灵活、成本低等优点，能有效突破传统单频可见激光技术的功率限制，为高功率、高稳定性的单频可见激光技术提供了新的技术方案，具有重要的实用价值和应用前景。

Figure 202210612145

In the present invention, a high-power sum-frequency laser generating method, a system and a phase modulation method thereof, output two single-frequency seed lasers from two single-frequency lasers, and use two driving signals to phase-modulate the two single-frequency lasers respectively , phase modulation simultaneously applies arbitrary signals of equal amplitude and opposite sign to the two seed lasers, so that the linewidths of the two single-frequency lasers are broadened and the two laser beams enter the laser amplifier, and the delay between the two signals is further adjusted. Linear crystal sum frequency to obtain single frequency laser output. The invention has the advantages of wide wavelength range, simple and compact structure, flexible design, low cost, etc., can effectively break through the power limitation of the traditional single-frequency visible laser technology, and provides a new technology for the single-frequency visible laser technology with high power and high stability The scheme has important practical value and application prospects.

Figure 202210612145

Description

High-power sum frequency laser generation method and system and phase modulation method thereof
Technical Field
The invention relates to the technical field of laser, in particular to a high-power sum frequency laser generation method, a high-power sum frequency laser generation system and a phase modulation method of the high-power sum frequency laser generation system.
Background
The infrared laser can effectively expand the wavelength range of the laser through a second-order nonlinear process, such as frequency doubling, sum frequency, optical parametric oscillation and the like, and visible light and ultraviolet laser output is realized. Visible light and ultraviolet band lasers have important applications in the fields of laser display, metal processing, quantum information technology, laser remote sensing and detection, medical imaging and treatment, cold atom and the like. Laser sum frequency technology is an effective way to obtain high power visible and ultraviolet lasers. In practical application, two beams of high-power single-frequency laser pumping are needed to realize high-efficiency sum frequency conversion efficiency and high-power sum frequency laser output, and the single-frequency laser power improvement is limited by various nonlinear effects, particularly stimulated brillouin scattering, so that the visible light and ultraviolet laser power is limited, wherein the stimulated brillouin scattering is abbreviated as SBS. The phase modulation technique is widely applied to power improvement of high-power single-frequency and narrow-linewidth fiber lasers due to a plurality of advantages.
However, in the phase modulation process, the line width of the single-frequency laser is widened and then amplified, so that the narrow line width characteristic of the laser is damaged to a certain extent, the line width of the sum frequency laser is further influenced, and the high-power single-frequency or narrow line width sum frequency laser cannot be obtained. The small-frequency laser formed by combining a plurality of single-frequency lasers can also inhibit SBS in the amplification process, but because the single-frequency lasers have no fixed phase relation, four-wave mixing is generated in the high-power amplification process, the laser line width is further widened, and the line width characteristic of the sum frequency laser is influenced, wherein the four-wave mixing is called FWM for short. The spectrum compression technology based on phase modulation and frequency multiplication can effectively solve the problem of low output power of single-frequency visible light and ultraviolet laser, however, the frequency multiplication scheme needs step type signals such as square waves or pseudo-random codes to perform phase modulation with fixed modulation depth, generates frequency multiplication laser with high demodulation rate, generally needs high-quality signals, is often higher in cost, and is limited in SBS suppression capability.
Therefore, how to avoid influencing the line width of the sum frequency laser in the phase modulation process, and solve the problem of low output power of the visible light and the ultraviolet laser with single frequency or narrow line width, and generating the laser with high spectral intensity and narrow line width is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The first purpose of the present invention is to provide a high power sum frequency laser generation method, which aims at the problem of low output power of single frequency or narrow linewidth visible light or ultraviolet laser in the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a high power sum frequency laser generation method, characterized by: the realization method comprises the following steps that two single-frequency lasers output two single-frequency seed lasers, two driving signals are adopted to respectively carry out phase modulation on the two single-frequency lasers, arbitrary signals with equal amplitude and opposite signs are simultaneously applied to the two seed lasers through the phase modulation, the line width of the two single-frequency lasers is widened, the nonlinear effect is improved, two beams of lasers enter a laser amplifier, the delay between the two signals is further adjusted, the two beams of lasers enter a sum frequency device after passing through the laser amplifier, the sum of phase modulation terms of the sum frequency lasers in the sum frequency device is a constant, and finally single-frequency laser output is obtained through sum frequency of a nonlinear crystal,
wherein, the following formula is satisfied during phase modulation:
Figure 270015DEST_PATH_IMAGE001
Figure 681405DEST_PATH_IMAGE002
Figure 447236DEST_PATH_IMAGE003
wherein,𝐸 1、 𝐸 2 is the intensity of a single-frequency fundamental optical field,𝐸 0 representing the amplitude of the incident single-frequency fundamental light,𝛽 1、 𝛽 2 for phase modulationDepth, phi 1 (t) 、 φ 2 (t) is a phase modulation function, f 1 (Ωt) 、 f 2 (Ω t) is an arbitrary function related to time, t is time,iin an imaginary unit, Ω is the frequency included in the phase modulation function, Φ is the phase difference generated by transmission amplification during the transmission of the two laser beams from phase modulation to sum frequency, and C is a constant.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: the driving signal is two signals, when the driving signal is periodic sine wave, cosine wave, square wave or triangular wave, the phase difference of the two signals is in the range of [ n pi-phi-pi/4, n pi + phi + pi/4 ], n is an odd number, phi is the phase difference generated by transmission amplification of the two laser beams in the transmission process from phase modulation to sum frequency, the driving signal compensates the phase difference, and the sum of phase modulation terms of the two laser beams with sum frequency is constant.
As a preferred technical scheme of the invention: the driving signals are two signals, when the driving signals are periodic pulses, pseudo-random signals or other arbitrary signals, the amplitudes of the two signals are equal, the signs of the two signals are opposite, the time delay between the two driving signals is adjusted, and the sum of the phase modulation terms of the two beams of laser with sum frequency is constant.
A second object of the present invention is to provide a high power sum frequency laser generating system, which overcomes the disadvantages of the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a high-power sum frequency laser generation system comprises a first single-frequency laser, a second single-frequency laser, a signal generator, a first phase modulator, a second phase modulator, a sum frequency laser amplification system and a laser sum frequency device, wherein the line width of the first single-frequency laser is less than 10 GHz, and the center wavelength difference is not more than 6 microns; the two driving signals generated by the signal generator respectively drive the first phase modulator and the second phase modulator to perform phase modulation on the two single-frequency lasers, and then the two single-frequency lasers are amplified and combined by the sum frequency laser amplification system, so that the nonlinear effect is improved, and finally the sum of the phase modulation terms of the two laser beams entering the laser sum frequency device is constant, and single-frequency sum frequency laser output is obtained.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: the sum frequency laser amplification system comprises a laser beam combining device, a laser amplification system and an isolator; the laser beam combining device selects an optical fiber laser beam splitter or coupler with a tail fiber, a laser beam splitter, a dichroic mirror, a polarization beam splitter or a laser beam combiner or a wavelength division multiplexer; one end of the laser beam combining device is connected with the first phase modulator and the second phase modulator together, the other end of the laser beam combining device is connected with the laser amplification system, and laser output by the laser amplification system passes through the isolator;
or the first phase modulator and the second phase modulator are respectively connected with the laser amplification system, and the laser amplification systems are jointly connected with the laser beam combining device and then pass through the isolator;
or the first phase modulator and the second phase modulator are respectively connected with the laser amplification system, and the laser amplification system is connected with the isolator and then is commonly connected with the laser beam combining device.
As a preferred technical scheme of the invention: the signal generator is a signal generator with adjustable signal amplitude, the peak value is not more than 10 kV, the bias is adjustable, and the frequency range of the signal generated by the signal generator is 0-100 GHz or the code rate is 0-500 Gbps;
the signal generator can generate a plurality of signals, and the phases or time delays among the signals can be mutually locked and adjusted;
the driving signal sent by the signal generator is a periodic signal or an aperiodic arbitrary signal, and the periodic signal comprises a sine signal, a cosine signal, a triangular wave signal, a square wave signal, a pulse signal and the like; the pseudo-random code signal is a signal with the amplitude value changing along with the time step type.
As a preferred technical scheme of the invention: the first phase modulator and the second phase modulator are electro-optic phase modulators with fiber tails or space electro-optic phase modulators, and the modulation depth and the frequency interval of the phase modulation laser are changed by the output amplitude, the frequency or the code rate adjusted by the signal generator.
As a preferred technical scheme of the invention: the laser amplification system comprises a one-stage or multi-stage rare earth doped solid amplifier, a solid Raman amplifier, a rare earth doped optical fiber amplifier and an optical fiber Raman amplifier which are connected in parallel or in cascade.
As a preferred technical scheme of the invention: the sum frequency device adopts intracavity frequency doubling, extraluminal resonance frequency doubling, single-pass frequency doubling, cascade single-pass frequency doubling and bi-pass frequency doubling;
the sum frequency crystal in the sum frequency device is selected from the following components: periodically poled lithium niobate, periodically poled lithium niobate doped with magnesium oxide, periodically poled stoichiometric ratio lithium tantalate doped with magnesium oxide, periodically poled potassium titanyl phosphate crystals, periodically poled potassium titanyl arsenate, potassium dihydrogen phosphate, potassium dideuterium phosphate, beta-barium metaborate crystals, lithium triborate crystals, bismuth borate crystals, lithium cesium borate crystals, or potassium titanyl phosphate crystals.
A third objective of the present invention is to provide a phase modulation method, which overcomes the drawbacks of the prior art.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the invention discloses a phase modulation method applied to laser sum frequency technology, which is characterized in that: two driving signals are adopted to respectively carry out phase modulation on the two single-frequency lasers, and the modulated lasers are amplified; during phase modulation, any signals with equal amplitude and opposite signs are applied to the two seed lasers, and the sum of phase modulation terms of the two amplified lasers is constant;
wherein, the following formula is satisfied during phase modulation:
Figure 962793DEST_PATH_IMAGE001
Figure 904204DEST_PATH_IMAGE002
Figure 611129DEST_PATH_IMAGE003
wherein,𝐸 1、 𝐸 2 for a single-frequency fundamental optical electric field strength,𝐸 0 representing the amplitude of the incident single-frequency fundamental light,𝛽 1、 𝛽 2 for phase modulation depth, phi 1 (t) 、 φ 2 (t) is a phase modulation function, f 1 (Ωt) 、 f 2 (Ω t) is an arbitrary function related to time, t is time,iin an imaginary unit, Ω is the frequency included in the phase modulation function, Φ is the phase difference generated by transmission amplification during the transmission of the two laser beams from phase modulation to sum frequency, and C is a constant.
The invention relates to a high-power sum frequency laser generating method, a high-power sum frequency laser generating system and a phase modulating method thereof.A single-frequency double-seed laser is subjected to phase modulation and amplification, the sum of phase modulation items between two amplified laser beams is constant, and high-power single-frequency sum frequency laser generation is obtained through laser sum frequency, wherein the sum frequency generation is called SFG for short; according to the high-power sum frequency laser generation method and the phase modulation method adopted by the high-power sum frequency laser generation method, the phase modulation of the single-frequency laser for sum frequency is carried out by adopting two arbitrary signals, so that the complexity of the device can be avoided, and the system cost is reduced; the invention can change the modulation depth, frequency interval and phase or delay between signals of the phase modulation laser by adjusting the amplitude, frequency and phase of the signal generator, not only can flexibly reduce the power spectral density of the single-frequency laser so as to better inhibit SBS, but also can flexibly and effectively adjust the phase delay of the two beams of laser in the sum frequency device, thereby obtaining the single-frequency SFG. The high-power sum frequency laser generating method and the phase modulation method thereof are suitable for sum frequency of any two single-frequency seed lasers, have wide application range, have the characteristics of simple structure, flexible modulation, high output power, good stability, low cost and the like, provide a new scheme of a high-power and high-stability single-frequency laser sum frequency technology, and have important practical value and wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a high power sum frequency laser generating device provided by the present invention;
FIG. 2 is a schematic structural diagram a of a sum frequency laser amplification system provided by the present invention;
fig. 3 is a schematic structural diagram b of a sum frequency laser amplification system provided by the invention;
fig. 4 is a schematic structural diagram c of a sum frequency laser amplification system provided by the invention;
FIG. 5 is a schematic diagram of a cascaded erbium-doped fiber laser amplifier according to the present invention;
FIG. 6 is a schematic diagram of a configuration of a parallel fiber laser amplifier according to the present invention;
fig. 7 is a schematic structural diagram of a sum frequency device provided by the present invention;
in the drawings:
a first single-frequency laser 1; a second single frequency laser 2; a signal generator 3; a first phase modulator 4; a second phase modulator 5; a laser beam combining device 6; the laser amplification system 7, 7.1 is a first-stage isolator, 7.2 is a first-stage amplifier, 7.3 is a second-stage isolator, 7.4 is a second-stage amplifier, 7.5 is a third-stage isolator, and 7.6 is a third-stage amplifier; an isolator 8; a laser sum frequency device 9; 9.1 is an optical focusing lens, 9.2 is a sum frequency crystal and a temperature control device thereof, 9.3 is a spectroscope, and 9.4 is a collimating lens; and a sum frequency laser amplification system 10.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
The invention relates to a high-power sum frequency laser generating method, which comprises the following steps of selecting two single-frequency lasers with the line width less than 10 GHz and the central wavelength difference not more than 6 microns to output two single-frequency seed lasers, adopting two driving signals to respectively carry out phase modulation on the two single-frequency lasers, simultaneously applying arbitrary signals with equal amplitude and opposite signs to the two seed lasers by the phase modulation to widen the line width of the two single-frequency lasers and enable the two beams of lasers to enter a laser amplifier, simultaneously further adjusting the delay between the two signals, enabling the two beams of lasers to enter a sum frequency device after passing through the laser amplifier, enabling the sum of phase modulation terms of the sum frequency lasers in the sum frequency device to be a constant, and finally obtaining single-frequency laser output through nonlinear crystal sum frequency,
wherein, the following formula is satisfied during phase modulation:
Figure 5201DEST_PATH_IMAGE001
Figure 822985DEST_PATH_IMAGE002
Figure 353323DEST_PATH_IMAGE003
wherein,𝐸 1、 𝐸 2 for a single-frequency fundamental optical electric field strength,𝐸 0 representing the amplitude of the incident single-frequency fundamental light,𝛽 1、 𝛽 2 is the phase modulation depth, phi 1 (t) 、 φ 2 (t) is a phase modulation function, f 1 (Ωt) 、 f 2 (Ω t) is an arbitrary function related to time, t is time,iin an imaginary unit, Ω is the frequency included in the phase modulation function, Φ is the phase difference generated by transmission amplification during the transmission of the two laser beams from phase modulation to sum frequency, and C is a constant.
In the invention, two arbitrary driving signals with equal amplitude and opposite sign are adopted to respectively modulate the phase of two beams of single-frequency laser, so that the sum of the phase modulation terms of the two beams of laser in sum frequency is a constant, thereby obtaining single-frequency sum frequency laser output. Two driving signals are adopted to respectively carry out phase modulation on two single-frequency lasers, and the two single-frequency lasers are used for inhibiting nonlinear effects such as stimulated Brillouin scattering and the like in the laser amplification process; further adjusting the delay between the two driving signals, so that after phase modulation and amplification, the sum of phase modulation terms of the two laser beams subjected to sum frequency is a constant, and finally obtaining single-frequency laser through a sum frequency process; wherein, two drive signals of phase modulation are arbitrary signals, satisfy the condition: the two driving signals have equal amplitude and opposite signs, the two driving signals have equal amplitude including being completely equal or nearly equal, and when the two beams of laser after phase modulation sum frequency, the sum of phase modulation terms of the two beams of laser is constant.
When the driving signal is two periodic sine waves, cosine waves, square waves or triangular waves, the phase difference of the two signals is in the range of [ n pi-phi-pi/4, n pi + phi + pi/4 ], n is an odd number, phi is the phase difference generated by transmission amplification and the like in the transmission process of phase modulation to sum frequency of the two laser beams, and the sum of the phase modulation terms of the two laser beams with the sum frequency is constant by compensating the phase.
When the driving signals are two periodic pulses, pseudo-random signals or other arbitrary signals, the two signals have equal amplitudes and opposite signs, and the sum of two laser phase modulation terms for sum frequency is constant by adjusting the time delay between the two signals, so that single-frequency sum frequency laser output is obtained.
The invention relates to a high-power sum frequency laser generating method, which utilizes two single-frequency lasers with the line width less than 10 GHz and the central wavelength difference not more than 6 microns to respectively apply two arbitrary signals with equal or close amplitude values to the two phase modulators through the two phase modulators, so that the line widths of the two single-frequency lasers are widened, the two beams of lasers enter a laser amplifier, meanwhile, the delay between the two signals is further adjusted, the sum of phase modulation items of the two beams of lasers in a sum frequency device is constant after the two beams of lasers pass through the amplifier, and finally, single-frequency laser output is obtained through nonlinear crystal sum frequency.
The phase modulation in the invention has the characteristics of wide wavelength range and flexible adjustment, the modulation process can effectively inhibit the stimulated Brillouin scattering in laser amplification and obtain high-power laser, and simultaneously, single-frequency and sum-frequency laser output can be obtained by adjusting the delay between two signals, thereby realizing the preparation of high-power and high-stability single-frequency or narrow-linewidth visible laser.
The invention discloses a high-power sum frequency laser generating system, which comprises: the laser frequency summation device comprises a first single-frequency laser 1, a second single-frequency laser 2, a signal generator 3, a first phase modulator 4, a second phase modulator 5, a summation frequency laser amplification system 10 and a laser summation frequency device 9.
The first single-frequency laser 1 and the second single-frequency laser 2 are respectively connected with the first phase modulator 4 and the second phase modulator 5, and the first phase modulator 4 and the second phase modulator 5 are then commonly connected with the sum frequency laser amplification system 10 and the laser sum frequency device 9; the two signals generated by the signal generator 3 respectively drive the first phase modulator 4 and the second phase modulator 5, so that the sum of phase modulation terms on the two laser beams finally entering the laser sum frequency device 9 is constant after passing through the first phase modulator 4 and the second phase modulator 5 and then being amplified and combined by the sum frequency laser amplification system 10, thereby obtaining single-frequency sum frequency laser output.
The sum frequency laser amplification system 10 includes: the device comprises a laser beam combining device 6, a laser amplification system 7 and an isolator 8; the connection mode of the sum frequency laser amplification system 10 may be as follows: one end of the laser beam combining device 6 is connected with the first phase modulator 4 and the second phase modulator 5 together, the other end of the laser beam combining device is connected with the laser amplification system 7, and laser output by the laser amplification system 7 sequentially passes through the isolator 8; the connection mode of the sum frequency laser amplification system 10 may also be: the first phase modulator 4 and the second phase modulator 5 are respectively connected with the laser amplification system 7. The laser amplification systems 7 are connected with the laser beam combining device 6 together and then sequentially pass through the isolator 8; or the laser amplification system 7 is connected with the isolator 8 and then is connected with the laser beam combining device 6 together.
The first single-frequency laser 1 and the second single-frequency laser 2 can be rare earth doped solid lasers, solid raman lasers, distributed feedback DFB semiconductor lasers, external cavity semiconductor ECDL lasers, distributed feedback DFB fiber lasers or distributed bragg reflection DBR fiber lasers or other lasers or any combination of the above lasers, and the linewidths of the generated single-frequency lasers are all less than 10 GHz; the difference of the central wavelengths of the first single-frequency laser 1 and the second single-frequency laser 2 is not more than 6 microns.
The signal generator 3 is a periodic signal, including a sine signal, a cosine signal, a triangular wave signal, a square wave signal, a pulse signal and the like; pseudo-random code signal constant amplitude is along with the signal of the step type change of time; and other arbitrary signals.
The signal generator 3 can generate a plurality of signals, and the phases or time delays among the signals can be locked with each other or adjusted; the amplitude of the signal generated by the signal generator 3 is adjustable, the peak-to-peak value is not more than 10 kV, and the bias is adjustable; the frequency range of the signal generated by the signal generator 3 is 0-100 GHz or the code rate is 0-500 Gbps; the modulation depth and frequency interval of the phase modulated laser can be changed by adjusting the output amplitude, frequency or code rate of the signal generator 3.
The first phase modulator 4 and the second phase modulator 5 are electro-optic phase modulators with fiber tails or space electro-optic phase modulators and are driven by the generator 3; the output ends of the first phase modulator 4 and the second phase modulator 5 are connected with a sum frequency laser amplification system 10.
The laser beam combining device 6 is a device with a laser beam combining function, such as an optical fiber laser beam splitter (or coupler) with a tail fiber, a laser beam splitter, a dichroic mirror, a polarization beam splitter, a laser beam combiner or a Wavelength Division Multiplexer (WDM).
The laser amplification system 7 comprises a one-stage or multi-stage rare earth doped solid amplifier, a solid Raman amplifier, a rare earth doped optical fiber amplifier, an optical fiber Raman amplifier and the like which are connected in parallel or in cascade, and the parallel connection or cascade combination of the laser amplifiers.
The sum frequency device 9 adopts intracavity frequency doubling, extracavity resonance frequency doubling, single-pass frequency doubling, cascade single-pass frequency doubling, double-pass frequency doubling and the like.
The sum frequency crystal in the sum frequency device is periodically polarized lithium niobate PPLN, periodically polarized lithium niobate MgO doped with magnesium oxide PPLN, periodically polarized lithium tantalate MgO doped with magnesium oxide PPSLT, periodically polarized potassium titanyl phosphate crystal PPKTP, periodically polarized potassium titanyl arsenate PPKTA, potassium titanyl arsenate KTA, potassium dihydrogen phosphate (KDP), potassium dideuterium phosphate (DKDP), beta-barium metaborate crystal BBO, lithium triborate crystal LBO, bismuth borate crystal BIBO, lithium cesium borate crystal CLBO or potassium titanyl phosphate crystal KTP.
The invention discloses a phase modulation method, which is applied to a laser sum frequency technology, and is characterized in that two driving signals are adopted to respectively carry out phase modulation on two single-frequency lasers and amplify the modulated lasers; during phase modulation, any signals with equal amplitude and opposite signs are applied to the two seed lasers, and the sum of phase modulation terms of the two amplified lasers is constant;
wherein, the following formula is satisfied during phase modulation:
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wherein,𝐸 1、 𝐸 2 for a single-frequency fundamental optical electric field strength,𝐸 0 representing the amplitude of the incident single-frequency fundamental light,𝛽 1、 𝛽 2 for phase modulation depth, phi 1 (t) 、 φ 2 (t) is a phase modulation function, f 1 (Ωt) 、 f 2 (Ω t) is an arbitrary function related to time, t is time,iis an imaginary unit, omega is the frequency contained in the phase modulation function, phi is the phase difference generated by the transmission amplification of the two laser beams in the transmission process from phase modulation to sum frequency, C isA constant.
Example 1
As shown in fig. 1, fig. 2, fig. 5, and fig. 7, in the method for generating high power sum frequency laser according to the present invention, two sinusoidal signals are adopted, two single frequency lasers with a line width smaller than 10 MHz are subjected to sinusoidal phase modulation, a spectrum is spread to suppress the SBS effect during amplification, two laser beams after phase modulation enter a cascaded laser amplifier together to be amplified through laser beam combination, the amplified laser beams pass through an isolator and are subjected to single pass sum frequency, and the phase difference of the two sinusoidal phase modulation signals is adjusted to obtain the high power single frequency sum frequency laser.
In this embodiment, a high power sum frequency laser generating system includes a first single frequency laser 1 which is a single frequency distributed feedback semiconductor laser with a line width of 10 MHz and has a center wavelength of 1064 nm; the second single-frequency laser 2 is a single-frequency distribution feedback DFB fiber laser with the line width of 2 MHz and the central wavelength of 1064.5 nm; the signal generator 3 adopts an arbitrary wave signal source to generate two sinusoidal signals, the frequency is 100 MHz, the output amplitude is 6V, the phase between the signals is fixed to pi-pi/5, and the MgO-doped LN first phase modulator 4 and the MgO-doped LN second phase modulator 5 are respectively driven, wherein the pi/5 is the phase difference between two beams of laser in the transmission and amplification process. The sum frequency laser amplification system 10 is connected as follows: one end of the laser beam combining device 6 is connected with the first phase modulator 4 and the second phase modulator 5 together, the other end of the laser beam combining device is connected with the laser amplification system 7, and the laser output by the laser amplification system 7 sequentially passes through the isolator 8. The laser beam combining device 6 employs a 2 × 2 50: 50 a beam splitter; the laser amplification system 7 is a cascaded rare earth doped fiber laser amplifier, a gain fiber of the laser amplification system is a ytterbium-doped fiber, wherein 7.1 is a primary isolator, 7.2 is a primary ytterbium-doped fiber amplifier, 7.3 is a secondary isolator, 7.4 is a secondary ytterbium-doped fiber amplifier, 7.5 is a tertiary isolator, 7.6 is a tertiary ytterbium-doped fiber amplifier, and N =2 at the moment; the isolator 8 is a 1064 nm space isolator; the laser sum frequency device 9 is a single pass sum frequency structure, 9.1 is an optical focusing lens, 9.2 is a sum frequency crystal PPSLT and a temperature control device thereof, 9.3 is a spectroscope, and 9.4 is a collimating lens.
In the high-power sum frequency laser generating system in this embodiment, the phase difference between the two sinusoidal signals is pi/5, the sum of the phase modulation terms of the two laser beams in the sum frequency device is 0, and the central wavelength of the output laser beam is 532.125 nm.
Example 2
As shown in fig. 1, fig. 3, fig. 6, and fig. 7, in the method for generating high power sum frequency laser according to the present invention, two square wave signals are adopted, two single frequency lasers with a line width less than 4 MHz are respectively phase-modulated, and a spectrum is spread to suppress the SBS effect during amplification; the two laser beams are respectively amplified through two laser amplifiers connected in parallel, and the amplified laser beams finally pass through the laser combination together through an isolator and are subjected to single pass and sum frequency; and the high-power single-frequency and sum-frequency laser is obtained by adjusting the phase difference of the two square wave signals. The high-power sum-frequency laser generation system in the embodiment comprises a first single-frequency laser 1, a second single-frequency laser 1, a third single-frequency laser, a fourth single-frequency laser, a fifth single-frequency laser, a sixth single-frequency laser, a fifth single-frequency laser, a sixth single-frequency laser, a fifth single-frequency laser, a sixth single-frequency laser, a fourth single-frequency laser, a third single-frequency laser, a fourth single-frequency laser, a fourth single-frequency, a third single-frequency laser, a fourth single-frequency, a third, a fourth, a, in this embodiment, a, in this embodiment, a, the first, the, a, the, in this, the; the second single-frequency laser 2 is a single-frequency distribution feedback DFB fiber laser with the line width of 4 MHz and the central wavelength of 1319 nm; the signal generator 3 adopts an arbitrary wave signal source to generate two square wave signals, the frequency is 50 MHz, the output amplitude is 8V, the phase between the signals is fixed to pi-pi/8, and an MgO-doped SLT first phase modulator 4 and an MgO SLT second phase modulator 5 are respectively driven, wherein the pi/8 is the phase difference between two beams of laser in the transmission and amplification process. The connection mode of the sum frequency laser amplification system 10 is as follows: the first phase modulator 4 and the second phase modulator 5 are respectively connected with the laser amplification system 7, and the laser amplification system 7 is commonly connected with the laser beam combining device 6 and then sequentially passes through the isolator 8. The laser beam combining device 6 adopts a 45-degree dichroic mirror to achieve 1319nm high reflection and 1064 nm high transmission; the laser amplification system 7 is a parallel structure of a first path of ytterbium-doped rare-earth optical fiber laser amplifier and a second path of phosphorus-doped optical fiber Raman laser amplifier, wherein 7.1 is a first path of primary isolator, 7.2 is a first path of primary ytterbium-doped optical fiber amplifier, 7.5 is a first path of secondary isolator, and 7.6 is a first path of secondary ytterbium-doped optical fiber amplifier; 7.3 is a second way primary isolator, 7.4 is a second way primary phosphorus-doped optical fiber Raman laser amplifier, 7.7 is a second way secondary isolator, 7.8 is a second way secondary phosphorus-doped optical fiber Raman laser amplifier, and N = 1; the isolator 8 is a space isolator, and comprises an isolator of 1064 nm and an isolator of 1319 nm; the laser sum frequency device 9 is a cascade single pass sum frequency structure, 9.1 is an optical focusing lens, 9.2 comprises two sum frequency crystals LBO, a focusing lens and a temperature control device, 9.3 is a spectroscope, and 9.4 is a collimating lens.
In the high-power sum frequency laser generating system in this embodiment, the phase difference between the two square wave signals is pi/8, the sum of the phase modulation terms of the two laser beams in the sum frequency device is 0, and the central wavelength of the output laser beam is 588.928 nm.
Example 3:
as shown in fig. 1, fig. 2, fig. 5, and fig. 7, in the method for generating high power sum frequency laser according to the present invention, two triangular wave signals are adopted, two single frequency lasers with a linewidth less than 0.8 MHz are respectively phase-modulated, and a spectrum is spread to suppress the SBS effect during amplification; combining two beams of laser through lasers, carrying out cascade laser amplification, amplifying the two beams of laser, and finally carrying out single-pass sum frequency by the amplified laser respectively through an isolator; and the high-power single-frequency and sum-frequency laser is obtained by adjusting the time delay of the two triangular wave signals.
In this embodiment, a high power sum frequency laser generating system includes a first single frequency laser 1 which is a distributed bragg reflection DBR single frequency fiber laser with a line width of 0.3 MHz, and has a central wavelength of 1063.5 nm; the second single-frequency laser 2 is a single-frequency distribution feedback DFB fiber laser with the line width of 0.8 MHz and the central wavelength of 1064.5 nm; the signal generator 3 adopts an arbitrary wave signal source to generate two triangular wave signals, the frequency is 150 MHz, the output amplitude is 8V, the phase between the signals is fixed to pi-pi/2, and the MgO-doped LN first phase modulator 4 and the MgO-doped LN second phase modulator 5 are respectively driven, wherein the pi/2 is the phase difference between two beams of laser in the transmission and amplification process. The sum frequency laser amplification system 10 is connected as follows: one end of the laser beam combining device 6 is commonly connected with the first phase modulator 4 and the second phase modulator 5, the other end of the laser beam combining device is connected with the laser amplification system 7, and laser output by the laser amplification system 7 sequentially passes through the isolator 8. The laser beam combining device adopts a 2 x 2 40: 60 a beam splitter; the laser amplification system 7 is a cascaded rare earth doped solid laser amplifier, the gain of which is ytterbium-doped yttrium aluminum garnet Yb: YAG crystal, wherein 7.1 is a primary isolator, 7.2 is a primary Yb: YAG amplifier, 7.3 is a secondary isolator, 7.4 is a secondary Yb: YAG amplifier, 7.5 is a tertiary isolator, 7.6 is a tertiary Yb: YAG amplifier, and N = 2; the isolator 8 is a 1064 nm space isolator; the sum frequency device 9 is a single pass sum frequency structure, 9.1 is an optical focusing lens, 9.2 is a sum frequency crystal PPLN and a temperature control device thereof, 9.3 is a spectroscope, and 9.4 is a collimating lens.
In the high-power sum frequency laser generating system in the embodiment, the phase difference between the two square wave signals is pi/2, the phase modulation terms of the two laser beams in the sum frequency device are about 0, and the central wavelength of the output laser is 532 nm.
Example 4:
as shown in fig. 1, 4, 6 and 7, the high power sum frequency laser generation method of the present invention adopts two laser beams 2 7 The pseudo-random signal of-1, two single-frequency lasers with the line width less than 8 MHz are respectively subjected to phase modulation, and the spectrum is spread to inhibit the SBS effect in the amplification process; the two laser beams are respectively amplified through two laser amplifiers connected in parallel, and the amplified laser beams finally pass through the laser combination together through an isolator and are subjected to single pass and sum frequency; by regulating two paths 2 7 -1, thereby obtaining high power single frequency and frequency laser light.
In this embodiment, a high power sum frequency laser generating system includes a first single frequency laser 1 which is a distributed bragg reflection DBR single frequency fiber laser with a line width less than 8 MHz and has a center wavelength of 1064.1 nm; the second single-frequency laser 2 is a single-frequency Raman fiber laser with the line width of 2 MHz and the central wavelength of 1319.2 nm; the signal generator 3 is a pseudo-random code signal source and generates two paths 2 7 -1 pseudo-random signal, pseudo code rate 2 Gbps, output amplitude 7V, time delay between signals fixed at 910 ps, driving MgO-doped LN first phase modulator 4 and MgO-doped LN second phase modulator 5, respectively. The connection mode of the sum frequency laser amplification system 10 is as follows: the first phase modulator 4 and the second phase modulator 5 are respectively connected with the laser amplifierAnd the laser amplification systems 7 are respectively connected with the laser beam combining device 6 through the isolators 8. The laser amplification system 7 is a first path of rare earth doped fiber laser amplifier and a second path of quartz fiber Raman laser which are connected in parallel, gain fibers of the laser amplification system are ytterbium-doped fibers and passive quartz fibers respectively, wherein 7.1 is a first path of primary isolator, 7.2 is a first path of primary ytterbium-doped fiber amplifier, 7.5 is a first path of secondary isolator, 7.6 is a first path of secondary ytterbium-doped fiber amplifier, 7.9 is a first path of tertiary isolator, and 7.10 is a first path of tertiary ytterbium-doped fiber amplifier; 7.3 is a second primary isolator, 7.4 is a second primary ytterbium-doped optical fiber amplifier, 7.7 is a second secondary isolator, 7.8 is a second secondary ytterbium-doped optical fiber amplifier, 7.11 is a second tertiary isolator, 7.15 is a second tertiary ytterbium-doped optical fiber amplifier, and N = 2; the isolator 8 is a space isolator, and comprises an isolator of 1064 nm and an isolator of 1319 nm; the sum frequency device 9 is a single-pass sum frequency structure, 9.1 is an optical focusing lens, 9.2 is a sum frequency crystal LBO and a temperature control device thereof, 9.3 is a spectroscope, and 9.4 is a collimating lens.
In the high power sum frequency laser generating system of the present embodiment, two are 2 7 The time delay of the pseudo-random signal of-1 is fixed to 910 ps, the phase modulation terms of the two lasers in the sum frequency device are about 0, and the central wavelength of the output laser is 589 nm.
Example 5:
as shown in fig. 1, 2, 6 and 7, the high power sum frequency laser generation method of the present invention adopts two laser beams 2 3 1, respectively carrying out phase modulation on two single-frequency lasers with the line width smaller than 1 MHz, and expanding the spectrum to inhibit the SBS effect in the amplification process; combining two beams of laser through lasers, carrying out cascade laser amplification, amplifying the two beams of laser, and finally carrying out single-pass sum frequency by the amplified laser respectively through an isolator; by regulating two paths 2 3 -1, thereby obtaining high power single frequency and frequency laser light.
In this embodiment, a high power sum frequency laser generating system includes a first single frequency laser 1 which is a single frequency external cavity semiconductor ECDL laser with a linewidth less than 0.5 MHz and a center wavelength1560nm, the second single-frequency laser 2 is a single-frequency external cavity semiconductor ECDL laser with line width of 1 MHz and has central wavelength of 1550 nm; the signal generator 3 is a pseudo-random code signal source and generates two paths 2 3 A pseudo-random signal of-1, a pseudo code rate of 1.71 Gbps, an output amplitude of 10V, and a time delay between signals fixed at 800 ps. The sum frequency laser amplification system 10 is connected as follows: one end of the laser beam combining device 6 is connected with the first phase modulator 4 and the second phase modulator 5 together, the other end of the laser beam combining device is connected with the laser amplification system 7, and the laser output by the laser amplification system 7 sequentially passes through the isolator 8. A laser beam combining device, which adopts a 2 x 2 50: 50 a fiber coupler; the laser amplification system 7 is a cascaded erbium-doped fiber laser amplifier, a gain fiber of the laser amplification system is an erbium-doped fiber, wherein 7.1 is a first-level fiber isolator, 7.2 is a first-level erbium-doped fiber amplifier, 7.3 is a second-level fiber isolator, 7.4 is a second-level erbium-doped fiber amplifier, and N =1 at this time; the isolator 8 is a 1550 nm space isolator; the sum frequency device 9 is a double-pass sum frequency structure, 9.1 is an optical focusing lens, 9.2 comprises a sum frequency crystal PPLN, a concave total reflection mirror pair 1560nm and 1550 nm high reflection and temperature control devices thereof, 9.3 is an 777.5 nm spectroscope, and 9.4 is a sum frequency light collimating lens.
In the high power sum frequency laser generation system of this embodiment, two are 2 3 The time delay of the pseudo-random signal of-1 is fixed to 800 ps, the phase modulation terms of the two lasers in the sum frequency device are about 0, and the central wavelength of the output laser is 777.492 nm.
According to the method and the system for generating the high-power sum frequency laser, the single-frequency double-seed laser of the sum frequency is modulated and amplified in phase, high-power output is realized, and the high-power single-frequency laser is further obtained through the sum frequency process; the phase modulation applies arbitrary signals with equal amplitude and opposite signs to the two seed lasers simultaneously, and the sum of the phase modulation terms is constant in the sum frequency process, so that the power limitation of the traditional single-frequency visible laser technology is effectively broken through, and the high-power and high-stability single-frequency and high-frequency visible laser output is realized.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.

Claims (10)

1.一种高功率和频激光产生方法，其特征在于：其实现方法如下，两个单频激光器输出角频率为ω1和ω2的两个单频种子激光，采用两个驱动信号分别对角频率为ω1和ω2的两个单频激光进行相位调制，相位调制同时对两个种子激光施加幅值相等、符号相反的任意信号，使得两个单频激光线宽展宽并让两束激光进入激光放大器，同时进一步调节两个信号间的延迟，两束光通过激光放大器后进入和频装置，和频装置中和频的激光的相位调制项之和为常数，最终通过非线性晶体和频得到单频激光输出，1. a high-power sum-frequency laser generation method, is characterized in that: its realization method is as follows, two single-frequency laser output angular frequencies are two single-frequency seed lasers of ω 1 and ω 2 , adopt two driving signals to respectively Two single-frequency lasers with angular frequencies ω 1 and ω 2 are phase-modulated. The phase modulation simultaneously applies arbitrary signals of equal amplitude and opposite sign to the two seed lasers, so that the linewidths of the two single-frequency lasers are broadened and the two beams The laser enters the laser amplifier and further adjusts the delay between the two signals. The two beams of light enter the sum-frequency device after passing through the laser amplifier. The sum of the phase modulation terms of the sum-frequency laser in the sum-frequency device is constant, and finally passes through the nonlinear crystal and frequency to obtain a single-frequency laser output, 其中，相位调制满足公式：where the phase modulation satisfies the formula:
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 其中，𝐸1、𝐸2为单频基频光电场强度，𝐸0表示入射单频基频光的振幅，𝛽1、𝛽2为相位调制深度，φ1(t)、φ2(t)为相位调制函数， f1(Ωt)、f2(Ωt)为与时间相关的任意函数， t为时间，i为虚数单位，Ω为相位调制函数所包含的频率，φ为两束激光在相位调制至和频的传输过程中因传输放大产生的相位差，C为常数。Among them, 𝐸 1, 𝐸 2 are the single-frequency fundamental frequency optical field strength, 𝐸 0 is the amplitude of the incident single-frequency fundamental frequency light, 𝛽 1, 𝛽 2 are the phase modulation depths, φ 1 (t) , φ 2 (t) are Phase modulation function, f 1 (Ωt) and f 2 (Ωt) are arbitrary functions related to time, t is time, i is an imaginary unit, Ω is the frequency contained in the phase modulation function, and φ is the phase modulation of the two laser beams. The phase difference due to transmission amplification in the transmission process to the sum frequency, C is a constant. 2.如权利要求1所述的高功率和频激光产生方法，其特征在于：所述驱动信号为两个信号，当驱动信号为周期性的正弦、余弦、方波或三角波时，两者相位差位于[nπ-φ-π/4, nπ+φ+π/4]范围内，n为奇数、φ为两束激光在相位调制至和频的传输过程中因传输放大产生的相位差，调节驱动信号补偿该相位差，以实现用于和频的两束激光的相位调制项之和为常数。2. The high-power sum-frequency laser generating method according to claim 1, wherein the driving signal is two signals, and when the driving signal is a periodic sine, cosine, square wave or triangular wave, the phases of the two are The difference is in the range of [nπ-φ-π/4, nπ+φ+π/4], n is an odd number, φ is the phase difference generated by the transmission amplification of the two laser beams during the transmission process from phase modulation to sum frequency, adjust The drive signal compensates for this phase difference so that the sum of the phase modulation terms of the two laser beams for sum frequency is constant. 3.如权利要求 1所述的高功率和频激光产生方法，其特征在于：所述驱动信号为两个信号，所述驱动信号为周期性的脉冲、伪随机信号或其他任意信号时，两个信号幅值相等、符号相反，调节两个驱动信号间的时间延迟，以实现经过相位调制和放大后，用于和频的两束激光相位调制项之和为常数。3. The high-power sum-frequency laser generating method according to claim 1, wherein the driving signal is two signals, and when the driving signal is a periodic pulse, a pseudo-random signal or any other signal, the two The amplitudes of the two signals are equal and the signs are opposite, and the time delay between the two driving signals is adjusted to realize that the sum of the phase modulation terms of the two laser beams used for sum-frequency is constant after phase modulation and amplification. 4.采用权利要求1-3任一权利要求所述方法的高功率和频激光产生系统，其特征在于：包括两个线宽小于10 GHz、中心波长差不大于6微米的第一单频激光器和第二单频激光器、信号发生器、第一相位调制器、第二相位调制器、和频激光放大系统以及激光和频装置；所述信号发生器产生的两个驱动信号，分别驱动所述第一相位调制器和第二相位调制器对两个单频激光进行相位调制，改善放大过程中的非线性效应，再经过和频激光放大系统放大以及合束，最终进入激光和频装置的两束激光上的相位调制项之和为常数，获得单频的和频激光输出。4. The high-power sum-frequency laser generating system using the method described in any one of claims 1-3, characterized in that: comprising two first single-frequency lasers with linewidths less than 10 GHz and center wavelength difference not greater than 6 microns and a second single-frequency laser, a signal generator, a first phase modulator, a second phase modulator, a sum-frequency laser amplification system, and a laser sum-frequency device; the two driving signals generated by the signal generator drive the The first phase modulator and the second phase modulator phase-modulate the two single-frequency lasers to improve the nonlinear effect during the amplification process, and then amplified and combined by the sum-frequency laser amplification system, and finally enter the two sides of the laser sum-frequency device. The sum of the phase modulation terms on the laser beam is constant, and a single-frequency sum-frequency laser output is obtained. 5.如权利要求4所述的高功率和频激光产生系统，其特征在于：和频激光放大系统包括激光合束装置、激光放大系统、隔离器；5. The high-power sum-frequency laser generating system according to claim 4, wherein the sum-frequency laser amplifying system comprises a laser beam combining device, a laser amplifying system, and an isolator; 所述激光合束装置一端共同连接第一相位调制器和第二相位调制器，另一端与所述激光放大系统连接，激光放大系统输出的激光再通过所述隔离器；One end of the laser beam combining device is commonly connected to the first phase modulator and the second phase modulator, and the other end is connected to the laser amplification system, and the laser output from the laser amplification system passes through the isolator; 或，所述第一相位调制器和第二相位调制器分别连接所述激光放大系统，所述激光放大系统共同连接激光合束装置，再通过所述隔离器；Or, the first phase modulator and the second phase modulator are respectively connected to the laser amplifying system, and the laser amplifying system is jointly connected to the laser beam combining device, and then passes through the isolator; 或，所述第一相位调制器和第二相位调制器分别连接所述激光放大系统，所述激光放大系统连接所述隔离器，再共同连接所述激光合束装置或，所述激光合束装置选用带尾纤的光纤激光分束器或耦合器、激光分束镜、二向色镜、偏振分束器或激光合束器或波分复用器。Or, the first phase modulator and the second phase modulator are respectively connected to the laser amplification system, the laser amplification system is connected to the isolator, and then jointly connected to the laser beam combining device or, the laser beam combining device The device selects fiber laser beam splitter or coupler with pigtail, laser beam splitter, dichroic mirror, polarization beam splitter or laser beam combiner or wavelength division multiplexer. 6.如权利要求4所述的高功率和频激光产生系统，其特征在于：所述信号发生器为信号幅值可调的信号发生器，峰值不大于10 kV且偏置可调，所述信号发生器产生的信号频率范围为0-100 GHz或码率为0-500 Gbps；所述信号发生器可以产生多个信号，信号间的相位或时间延迟可以相互锁定和调节；6. The high-power sum-frequency laser generating system according to claim 4, wherein the signal generator is a signal generator with adjustable signal amplitude, the peak value is not more than 10 kV and the offset is adjustable, and the The frequency range of the signal generated by the signal generator is 0-100 GHz or the code rate is 0-500 Gbps; the signal generator can generate multiple signals, and the phase or time delay between the signals can be mutually locked and adjusted; 所述的信号发生器发出的驱动信号选用周期性信号或非周期性的任意信号，所述周期性信号选用正弦信号、余弦信号、三角波信号、方波信号、脉冲信号；伪随机码信号，以及幅值随时间阶跃型变化的信号。The drive signal sent by the signal generator is selected as a periodic signal or aperiodic arbitrary signal, and the periodic signal is selected from a sine signal, a cosine signal, a triangle wave signal, a square wave signal, a pulse signal; a pseudo-random code signal, and A signal whose amplitude varies in a step-like manner with time. 7.如权利要求4所述的高功率和频激光产生系统，其特征在于：所述第一相位调制器和第二相位调制器为带纤尾的电光相位调制器或空间电光相位调制器，由所述信号发生器调节的输出幅值、时间延迟、频率或码率，分别改变相位调制激光的调制深度、相位和频率间隔。7. The high-power sum-frequency laser generating system according to claim 4, wherein the first phase modulator and the second phase modulator are electro-optical phase modulators or spatial electro-optical phase modulators with fiber tails, The output amplitude, time delay, frequency or code rate adjusted by the signal generator change the modulation depth, phase and frequency interval of the phase-modulated laser, respectively. 8.如权利要求4所述的高功率和频激光产生系统，其特征在于：所述激光放大系统包括并联或者级联的一级或多级稀土掺杂的固体放大器、固体拉曼放大器、稀土掺杂的光纤放大器、光纤拉曼放大器。8 . The high-power sum-frequency laser generating system according to claim 4 , wherein the laser amplifying system comprises parallel or cascaded one-stage or multi-stage rare-earth-doped solid-state amplifiers, solid-state Raman amplifiers, rare-earth Doped fiber amplifiers, fiber Raman amplifiers. 9.如权利要求4所述的高功率和频激光产生系统，其特征在于：所述和频装置采用腔内倍频，腔外谐振倍频、单通倍频、级联单通倍频、双通倍频；9. The high-power sum-frequency laser generating system according to claim 4, wherein the sum-frequency device adopts intra-cavity frequency doubling, extra-cavity resonance frequency doubling, single-pass frequency doubling, cascaded single-pass frequency doubling, Double pass frequency multiplication; 所述和频装置中的和频晶体选用：周期性极化的铌酸锂、掺氧化镁的周期性极化铌酸锂、掺氧化镁的周期性极化的化学计量比钽酸锂、周期性极化的磷酸钛氧钾晶体、周期性极化的砷酸钛氧钾、砷酸钛氧钾、磷酸二氢钾、磷酸二氘钾、β-偏硼酸钡晶体、三硼酸锂晶体、硼酸铋晶体、硼酸锂铯晶体或磷酸钛氧钾晶体。The sum-frequency crystals in the sum-frequency device are selected: periodically polarized lithium niobate, magnesium oxide-doped periodically polarized lithium niobate, and magnesium oxide-doped periodically polarized lithium tantalate with a stoichiometric ratio, periodic Sexually polarized potassium titanate phosphate crystal, periodically polarized potassium titanate arsenate, potassium titanate arsenate, potassium dihydrogen phosphate, potassium dideuterium phosphate, β-barium metaborate crystal, lithium triborate crystal, boric acid Bismuth crystal, lithium cesium borate crystal or potassium titanyl phosphate crystal. 10.一种相位调制方法，应用在激光和频技术中，其特征在于：采用两个驱动信号分别对两个单频激光进行相位调制，并对调制后的激光进行放大；相位调制时，对两个种子激光施加幅值相等、符号相反的任意信号，使放大后两束激光的相位调制项之和为常数；10. A phase modulation method, applied in laser sum-frequency technology, characterized in that: using two driving signals to phase-modulate two single-frequency lasers respectively, and amplifying the modulated lasers; The two seed lasers are applied with arbitrary signals of equal amplitude and opposite sign, so that the sum of the phase modulation terms of the two laser beams after amplification is constant; 其中，相位调制时满足下述公式：Among them, the phase modulation satisfies the following formula:
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 其中，𝐸1、𝐸2为单频基频光电场强度，𝐸0表示入射单频基频光的振幅，𝛽1、𝛽2为相位调制深度，φ1(t)、φ2(t)为相位调制函数，f1(Ωt)、f2(Ωt)为与时间相关的任意函数， t为时间，i为虚数单位，Ω为相位调制函数所包含的频率，φ为两束激光在相位调制至和频的传输过程中因传输放大产生的相位差，C为常数。Among them, 𝐸 1, 𝐸 2 are the single-frequency fundamental frequency optical field strength, 𝐸 0 is the amplitude of the incident single-frequency fundamental frequency light, 𝛽 1, 𝛽 2 are the phase modulation depths, φ 1 (t) , φ 2 (t) are Phase modulation function, f 1 (Ωt) and f 2 (Ωt) are arbitrary functions related to time, t is time, i is imaginary unit, Ω is the frequency included in the phase modulation function, and φ is the phase modulation of the two laser beams. The phase difference due to transmission amplification in the transmission process to the sum frequency, C is a constant.
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