Dual-wavelength asynchronous co-cavity amplification and frequency 589 nm laser and method

Abstract

The application belongs to the technical field of laser. A kind of dual-wavelength asynchronous common cavity amplification and frequency 589nm laser and method are provided, 1064nm and 1319nm single frequency continuous seed source are chopped after corresponding acoustooptic modulator, respectively pass through lens shaping, by first coupling mirror, couple into solid amplification module, two pulse light frequency are all, time sequence difference, all are located near the falling edge of pump source. After amplification, light is separated by first beamsplitter, 1064nm light passes through corresponding mirror, second 1064nm lens, 1319nm light passes through second 1319nm lens, then by second coupling mirror, couple into frequency conversion crystal, and output 589nm laser by second beamsplitter, the application simplifies structure, improves frequency conversion efficiency and beam quality.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and in particular to a dual-wavelength asynchronous common cavity amplified sum-frequency 589nm laser and its method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The 589nm laser corresponds to the strongest D2 absorption line of sodium atoms (vacuum wavelength 589.159nm), and is known as the sodium yellow laser. It can efficiently excite sodium atoms in the atmosphere at an altitude of approximately 90km above the ground, causing them to emit resonant fluorescence and form an artificial "guide star." This provides real-time atmospheric turbulence correction references for the adaptive optics systems of large ground-based telescopes, significantly improving imaging resolution and observation capabilities. The sodium yellow laser is widely used in cutting-edge science such as cold atom experiments (e.g., laser cooling and trapping of sodium atoms), atomic clock research, and quantum manipulation, providing a key tool for precision measurement and quantum simulation. Furthermore, the fluorescence properties of the sodium layer can be used to invert the density, temperature, and dynamic parameters of the mesosphere, aiding in space environment monitoring and the improvement of climate models. With the increasing development of space exploration, the 589nm sodium guide star laser technology has led to applications in astronomical observation, space debris tracking, inter-satellite laser communication, long-range magnetic field detection, and lidar wind measurement. In addition, the 589nm sodium yellow laser can also be used as a fundamental frequency source for nonlinear frequency conversion to generate short-wave ultraviolet lasers, with important applications in industrial processing and wafer inspection. Therefore, 589nm sodium yellow laser has important and broad application prospects in fields such as space exploration, space-to-ground communication, industrial processing, and national defense, and has become an international research hotspot in the field of laser technology.

[0004] The main methods for generating 589nm sodium yellow laser light include dye lasers and nonlinear frequency conversion techniques. Dyes, used as gain media, can directly generate 589nm laser light, representing the earliest realized sodium laser technology and being applied to the first sodium guide star laser adaptive optics observation system. However, organic dyes are toxic, easily degraded, and volatile; dye lasers are inefficient, have large systems, and high maintenance costs, and are rarely used now. With the continuous innovation and development of semiconductor-pumped all-solid-state lasers and fiber lasers, nonlinear frequency conversion techniques based on solid-state lasers and fiber and diamond Raman laser frequency doubling have become the mainstream technology for obtaining 589nm sodium guide star laser light. Fiber Raman frequency doubling utilizes the nonlinear stimulated Raman scattering (SRS) effect of silica fiber to shift the laser wavelength to 1178nm via Raman effect, and then generates 589nm laser light through frequency doubling. Diamond Raman lasers utilize the stimulated Raman scattering effect in diamond to shift the wavelength of ytterbium-doped fiber lasers from 1018 nm to 1178 nm, and then combine this with frequency doubling technology to achieve 589 nm laser output. Diamond crystals possess high Raman gain coefficients, extremely high thermal conductivity, and an ultra-wide transmittance range, supporting continuous wave or pulsed operation, and offering significant advantages such as high output power, good beam quality, and single-mode operation. Both fiber Raman frequency doubling and diamond Raman frequency doubling involve shifting the fiber laser wavelength to 1178 nm through stimulated Raman scattering, and then combining this with nonlinear frequency doubling technology to achieve 589 nm sodium yellow laser light. However, due to limitations in fiber characteristics and nonlinear effects, it is impossible to achieve high peak power and high energy 589 nm sodium yellow laser light.

[0005] With the continuous innovation and development of all-solid-state laser technology, the generation of 589nm lasers by combining 1064nm and 1319nm solid-state lasers has gradually become the mainstream technology for high-power, high-energy pulsed sodium guide star lasers. However, there are several problems with the generation of 589nm lasers by combining 1064nm and 1319nm solid-state lasers, which affect the performance of the 589nm laser after combining: (1) The 1064nm and 1319nm wavelengths are amplified by two amplifiers respectively. Due to the inconsistent thermal effects of different amplifiers, there are obvious differences in the beam quality of the 1064nm and 1319nm lasers after amplification, which affects the subsequent combining efficiency and the beam quality after combining; (2) After the repetition frequency is adjusted, the thermal effect of the crystal changes, and the beam quality of the amplified wavelength laser changes, which leads to changes in the combining efficiency and the beam parameters, affecting the efficiency of the 589nm laser coupling into the telescope system; (3) The structure of two amplifiers significantly increases the volume and complexity of the laser, increases the manufacturing cost of the laser, and is not conducive to the stability and environmental adaptability of the laser. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a dual-wavelength asynchronous common-cavity amplified and frequency-controlled 589nm laser and its method. The two wavelengths share a single solid-state amplification module, and the thermal effects of the solid-state amplification module are consistent, thereby ensuring that the beam quality and optical characteristic parameters of the 1064nm and 1319nm amplified lasers remain highly consistent. This is beneficial for improving the frequency-controlled efficiency and maintaining high beam quality during the subsequent frequency-controlled process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a dual-wavelength asynchronous common cavity amplified sum-frequency 589nm laser.

[0009] A dual-wavelength asynchronous common cavity amplified and frequency-controlled 589nm laser, wherein a 1064nm single-frequency continuous seed source, a first acousto-optic modulator, a first reflector and a first 1064nm lens are arranged sequentially along the optical path, and a 1319nm single-frequency continuous seed source, a second acousto-optic modulator and a first 1319nm lens are arranged sequentially along the optical path.

[0010] The first coupling mirror is used to receive 1064nm pulsed light from the 1064nm lens and 1319nm pulsed light from the 1319nm lens. The solid-state amplifier module is used to receive the coupled light output from the first coupling mirror. The frequencies of the 1064nm and 1319nm pulsed light are both... And the timing difference This ensures that both the 1064nm pulse light and the 1319nm pulse light are located at the falling edge position of the pump source of the solid-state amplifier module or at a distance from the falling edge position that is less than a set threshold.

[0011] The first beam splitter is used to receive the output light of the solid-state amplification module. The 1064nm pulse light reflected by the first beam splitter passes through the second mirror, the third mirror, and the second 1064nm lens in sequence before being output to the second coupling mirror.

[0012] The 1319nm pulsed light transmitted by the first beam splitter is output to the second coupler after passing through the second 1319nm lens. The second coupler is used to output coupled light to the sum-frequency crystal. The second beam splitter is used to receive the light output by the sum-frequency crystal, reflect and output 589nm laser light, and transmit and output 1064nm fundamental frequency light and 1319nm fundamental frequency light.

[0013] In one implementation of the first aspect of the present invention, a delay control unit and a signal generator are further included. The delay control unit is communicatively connected to the signal generator, and the signal generator is communicatively connected to the first acousto-optic modulator and the second acousto-optic modulator, respectively. The signal generator is used to set the relative delay of the 1064nm and 1319nm signals according to the instructions of the delay control unit. The delay control unit is used to adjust the delay of the two amplified beams of light through the second and third reflectors to achieve alignment of the two beams of light when they reach the sum-frequency crystal.

[0014] In one implementation of the first aspect of the present invention, the solid-state amplifier module includes a pump source and a gain crystal, the solid-state amplifier module operates in pulse mode, and the pump signal of the solid-state amplifier module is given by a signal generator.

[0015] As a further limitation of the first aspect of the present invention, the gain crystal is an Nd:YAG crystal.

[0016] In one implementation of the first aspect of the present invention, the first reflector, the second reflector, and the third reflector all reflect 1064nm at a 45° angle.

[0017] In one implementation of the first aspect of the present invention, the first coupling mirror, the first beam splitter, and the second coupling mirror all reflect 1064nm at a 45° angle and have high transmittance at 1319nm.

[0018] In one implementation of the first aspect of the present invention, the sum-frequency crystal is an LBO sum-frequency crystal.

[0019] In one implementation of the first aspect of the present invention, the second beam splitter has high transmittance of 45° for 1064nm and 1319nm, and high reflectivity for 589nm.

[0020] In one implementation of the first aspect of the present invention, the solid-state amplification module adopts an end-face pumping method; or, the solid-state amplification module adopts a side-pumping method.

[0021] Secondly, the present invention provides a method for generating 589nm laser light.

[0022] A method for generating 589nm laser, utilizing a dual-wavelength asynchronous common-cavity amplified and frequency-controlled 589nm laser according to the first aspect of this invention, includes the following process:

[0023] A 1064nm single-frequency continuous seed source is activated, outputting a continuous 1064nm single-frequency laser. The 1064nm single-frequency laser is incident along the optical path onto the first acousto-optic modulator. After being chopped by the first acousto-optic modulator, a 1064nm pulsed laser with a specific repetition frequency and pulse width is generated.

[0024] The generated 1064nm pulsed laser is incident on the first reflecting mirror along the optical path. After the propagation direction is adjusted by the reflection of the first reflecting mirror, it is incident on the first 1064nm lens. The first 1064nm lens shapes the spot of the 1064nm pulsed laser and optimizes the beam mode parameters.

[0025] The 1319nm single-frequency continuous seed source is activated to output a continuous 1319nm single-frequency laser. The 1319nm single-frequency laser is incident on the second acousto-optic modulator along the optical path. After being chopped by the second acousto-optic modulator, a 1319nm pulsed laser with a specific repetition frequency and pulse width is generated.

[0026] The generated 1319nm pulsed laser is incident on the first 1319nm lens along the optical path, and the first 1319nm lens performs spot shaping on the 1319nm pulsed laser to optimize the beam mode parameters.

[0027] The 1064nm pulsed laser, shaped by the first 1064nm lens, and the 1319nm pulsed laser, shaped by the first 1319nm lens, are incident on the first coupling mirror. The optical path coupling of the two laser beams is completed through the first coupling mirror, forming coupled light and outputting it to the solid-state amplification module.

[0028] The coupled light output from the first coupling mirror is incident on the solid-state amplification module, which amplifies the energy of the 1064nm pulsed laser and the 1319nm pulsed laser in the coupled light to obtain the amplified mixed coupled light.

[0029] The hybrid coupled light output from the solid-state amplification module is incident on the first beam splitter. The first beam splitter reflects the 1064nm laser and transmits the 1319nm laser, thus separating the optical paths of the two amplified laser beams.

[0030] The 1064nm laser reflected by the first beam splitter is sequentially incident on the second and third reflecting mirrors along the optical path. After two reflections and delays adjusted by optical path, it is incident on the second 1064nm lens, which reshapes the light spot and optimizes subsequent coupling and adaptation characteristics.

[0031] The 1319nm laser transmitted by the first beam splitter is incident on the second 1319nm lens along the optical path, and the second 1319nm lens reshapes the light spot to optimize the subsequent coupling and adaptation characteristics.

[0032] The 1064nm laser beam, shaped by the second 1064nm lens, and the 1319nm laser beam, shaped by the second 1319nm lens, are incident on the second coupling mirror. The two laser beams are coupled again through the second coupling mirror to form a coupled light that is adapted to the sum-frequency crystal and output to the sum-frequency crystal. The delay control unit adjusts the delay of the two beams through the second and third reflecting mirrors to achieve alignment of the two pulses when they arrive at the sum-frequency crystal.

[0033] The coupled light output from the second coupling mirror is incident on the sum-frequency crystal. Within the sum-frequency crystal, the 1064nm laser and the 1319nm laser interact through the nonlinear sum-frequency effect to generate a 589nm laser. The light output from the sum-frequency crystal includes the 589nm laser, the 1064nm fundamental frequency light that did not participate in the sum-frequency interaction, and the 1319nm fundamental frequency light.

[0034] The mixed light output from the sum-frequency crystal is incident on the second beam splitter. The second beam splitter reflects the 589nm laser and transmits the 1064nm and 1319nm fundamental frequency light, ultimately transmitting and outputting the target 589nm laser, while simultaneously reflecting and separating the fundamental frequency light that did not participate in the sum-frequency conversion.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] This invention innovatively develops a dual-wavelength asynchronous common-cavity amplified and frequency-controlled 589nm laser. The two wavelengths share a single solid-state amplification module, which significantly reduces the size of the laser, lowers the manufacturing cost, and improves the compactness and integration of the laser. The consistent thermal effects of the solid-state amplification module ensure that the beam quality and optical characteristics of the 1064nm and 1319nm amplified lasers remain highly consistent, which is beneficial for improving the frequency-controlled efficiency and maintaining high beam quality in the subsequent frequency-controlled process.

[0037] This invention employs asynchronous amplification combined with synchronous pumping technology, which can fix the operating repetition rate of the solid-state amplification module and solve the problem of crystal thermal effects changing with the laser's operating frequency. The laser frequency is changed simply by controlling the repetition rate of the laser injected into the solid-state amplification module. This effectively solves the problem of inconsistent beam parameters of the solid-state amplification module at different repetition rates caused by crystal thermal effects, thereby solving the problem of the 589nm sum-frequency efficiency at different repetition rates and the efficiency variation in coupling into the telescope system caused by beam changes at different repetition rates.

[0038] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 A schematic diagram of a dual-wavelength asynchronous common cavity amplified and frequency-controlled 589nm laser provided as an exemplary embodiment of the present invention;

[0041] Figure 2 A timing relationship diagram is provided as an exemplary embodiment of the present invention, wherein, Figure 2 (A) in the image represents the pulse sequences of the first type of 1064nm laser and 1319nm laser. Figure 2 (B) in the image represents the pulse sequences of the second type of 1064nm laser and 1319nm laser. Figure 2 (C) in the diagram represents the pulse sequence of the pump light;

[0042] The components include: 1. A 1064nm single-frequency continuous seed source; 2. A signal generator; 3. A 1319nm single-frequency continuous seed source; 4-1. A first acousto-optic modulator; 4-2. A second acousto-optic modulator; 5. A first 1319nm lens; 6. A first reflector; 7. A first 1064nm lens; 8. A first coupling mirror; 9. A solid-state amplifier module; 10. A delay control unit; 11. A second reflector; 12. A first beam splitter; 13. A second 1319nm lens; 14. A second coupling mirror; 15. A third reflector; 16. A sum-frequency crystal; and 17. A second beam splitter. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] The purpose of this invention is to overcome the problems of low beam quality consistency, large size, and high cost caused by the inconsistency in thermal effects of the 1064nm and 1319nm amplifiers in the traditional method of generating 589nm laser through sum-frequency conversion after energy amplification using 1064nm and 1319nm amplifiers. This invention innovatively proposes to achieve energy extraction of both 1064nm and 1319nm lasers within the same solid-state amplification module 9 by controlling the delay of the injected light. Sharing a single solid-state amplification module 9 significantly reduces the laser's size, with an expected reduction of 50%-70% in volume and 40%-60% in cost. It offers significant advantages such as high beam quality consistency, high sum-frequency efficiency, and substantial reduction in laser size and manufacturing cost. This invention overcomes key technical problems of traditional 589nm lasers through technological iteration and innovation, developing a high-performance, low-cost, and practical dual-wavelength asynchronous common-cavity amplified sum-frequency 589nm laser. Specifically, as shown... Figure 1 As shown, it includes: a 1064nm single-frequency continuous seed source 1, a first acousto-optic modulator 4-1, a first reflector 6, a first 1064nm lens 7, a 1319nm single-frequency continuous seed source 3, a second acousto-optic modulator 4-2, a first 1319nm lens 5, a first coupling mirror 8, a solid-state amplification module 9, a first beam splitter 12, a second reflector 11, a third reflector 15, a second 1064nm lens, a second 1319nm lens 13, a second coupling mirror 14, a sum-frequency crystal 16, and a second beam splitter 17.

[0046] A 1064nm single-frequency continuous seed source 1, a first acousto-optic modulator 4-1, a first reflector 6 and a first 1064nm lens 7 are arranged sequentially along the optical path, and a 1319nm single-frequency continuous seed source 3, a second acousto-optic modulator 4-2 and a first 1319nm lens 5 are arranged sequentially along the optical path.

[0047] The first coupling mirror 8 is used to receive the 1064nm pulse light output from the 1064nm lens and the 1319nm pulse light output from the 1319nm lens. The solid-state amplifier module 9 is used to receive the coupled light output from the first coupling mirror 8. The frequencies of the 1064nm pulse light and the 1319nm pulse light are both... And the timing difference This ensures that both the 1064nm pulse light and the 1319nm pulse light are located at the falling edge position of the pump source of the solid-state amplifier module 9 or at a distance from the falling edge position that is less than a set threshold.

[0048] The first beam splitter 12 is used to receive the output light of the solid-state amplifier module 9. The 1064nm pulse light reflected by the first beam splitter 12 passes through the second mirror 11, the third mirror 15 and the second 1064nm lens in sequence and is then output to the second coupling mirror 14. The delay control unit 10 controls the optical path between the second mirror 11 and the third mirror 15 to achieve the spatial delay of the 1064nm pulse timing, thereby achieving the alignment of the 1064nm and 1319nm pulses in the nonlinear sum-frequency crystal 16.

[0049] The 1319nm pulsed light transmitted by the first beam splitter 12 is output to the second coupler 14 after passing through the second 1319nm lens 13. The second coupler 14 is used to output coupled light to the sum-frequency crystal 16. The second beam splitter 17 is used to receive the light output by the sum-frequency crystal 16, reflect and output 589nm laser light, and transmit and output 1064nm fundamental frequency light and 1319nm fundamental frequency light.

[0050] In this implementation, the sum-frequency crystal 16 is lithium triborate (LBO). 1064nm fundamental frequency light and 1319nm fundamental frequency light are simultaneously injected into the LBO. Through the nonlinear sum-frequency effect, a 589nm single-frequency laser is generated. Both ends of the sum-frequency crystal 16 are coated with a film layer that has high transmittance to 808nm, 1064nm and 1319nm and a reflectivity of less than 0.05%.

[0051] In this implementation, the two wavelengths of 1064nm and 1319nm are amplified within a solid-state amplification module, that is, the two wavelengths are alternately amplified on a single crystal in the solid-state amplification module 9.

[0052] In this implementation, the 1064nm single-frequency continuous seed source 1 and the 1319nm single-frequency continuous seed source 3 can be any one of fiber laser, semiconductor laser, or solid-state laser. Those skilled in the art can choose according to the specific application environment, which will not be elaborated here.

[0053] In this preferred embodiment, it further includes a delay control unit 10 and a signal generator 2. The delay control unit 10 is communicatively connected to the signal generator 2. The signal generator 2 is communicatively connected to the first acousto-optic modulator 4-1 and the second acousto-optic modulator 4-2 respectively (the first acousto-optic modulator 4-1 and the second acousto-optic modulator 4-2 are used to generate pulse output light with a specific repetition frequency and pulse width by chopping the continuous seed source. The repetition frequency and pulse width can be set by the signal generator 2). The signal generator 2 is used to set the relative delay of the 1064nm and 1319nm signals, and at the same time, sends the synchronization signal to the solid-state amplification module and sets the corresponding delay to achieve the pulse synchronous pumping effect.

[0054] In this implementation, the first 1064nm lens 7 and the first 1319nm lens 5 are mainly used to shape the spot size of the 1319nm and 1064nm seed light injected into the solid-state amplification module, achieve mode matching, improve amplification efficiency and beam quality; the second 1064nm lens and the second 1319nm lens 13 are mainly used to shape the amplified 1064nm and 1319nm beams, optimize the spot parameters coupled into the sum-frequency crystal 16, and improve the efficiency and beam quality of nonlinear sum-frequency.

[0055] Specifically, signal generator 2 can generate synchronization and delay signals (two signals are synchronized by an external signal clock, and one of the signals is delayed to achieve time-domain delay of 1064nm and 1319nm, which is different from the traditional two-way amplification and spatial delay adjustment). The synchronization and delay signals can control the relative delay of the two wavelengths (1064nm and 1319nm) of seed light, and the signals are connected to solid-state amplification module 9 to control the pulsed seed light to be near the falling edge of the pump light (i.e. the pump light of solid-state amplification module 9) (within the position of the falling edge or within a specific falling edge set distance), so as to ensure that the number of particles in the upper energy level is utilized to the maximum extent.

[0056] In this implementation, the pump optical signal of the solid-state amplifier module 9 is derived from an external signal clock, which is the same as the 1064nm and 1319nm signals, thus eliminating the frequency jitter problem introduced by multiple external signals.

[0057] In this implementation, preferably, the solid-state amplifier module 9 includes a pump source and a gain crystal. The solid-state amplifier module 9 operates in pulse mode. The pump signal of the solid-state amplifier module 9 is provided by the signal generator 2. The gain crystal is an Nd:YAG crystal (i.e., neodymium-doped yttrium aluminum garnet crystal, with a neodymium ion doping concentration of 0.6%, and both ends of the Nd:YAG crystal are coated with a film layer that has high transmittance to 808nm, 1064nm and 1319nm and a reflectivity of less than 0.05%). The operating frequency of the solid-state amplifier module 9 is twice or higher than 1064nm or 1319nm. The pump wavelength of the solid-state amplifier module 9 is 808nm±3nm, and the pump pulse width is 250µs.

[0058] In this implementation, preferably, the first reflecting mirror 6, the second reflecting mirror 11, and the third reflecting mirror 15 all reflect 1064nm at a 45° angle; the first coupling mirror 8, the first beam splitter 12, and the second coupling mirror 14 all reflect 1064nm at a 45° angle and have high transmittance at 1319nm; the second beam splitter 17 has high transmittance at 45° for both 1064nm and 1319nm and reflects 589nm.

[0059] In this implementation, preferably, the solid-state amplification module 9 adopts an end-face pumping method; or, the solid-state amplification module 9 adopts a side-pumping method. When the end-face pumping method is adopted, the laser gain crystal is encapsulated in a high thermal conductivity copper heat sink by thermal welding, and a water-cooling channel is integrated in the heat sink. The waste heat generated by the crystal is efficiently removed by circulating cooling water, thereby effectively maintaining the stability of the crystal's operating temperature, ensuring the output performance and long-term reliability of the laser at high power, and the pump source for end-face pumping amplification is a laser diode pump source with a center wavelength of 808nm.

[0060] Examples of end-face pumping and side-face pumping are given below:

[0061] Example 1: Solid-state amplifier module 9 adopts a side-pumping method with a certain repetition frequency. The rod-shaped crystal is placed in the side-pumping module, and a high-power semiconductor laser bar is used as the pump source to pump the side of the crystal. Water cooling is provided in the side-pumping module to dissipate heat from the crystal.

[0062] The 1064nm single-frequency continuous laser seed source, after being modulated by the first acousto-optic modulator 4-1 controlled by the signal generator 2, generates a frequency of... Pulse width is The pulsed laser, after being reflected by the first reflecting mirror 6, is shaped by the first 1064nm lens 7.

[0063] The 1319nm single-frequency continuous laser seed source, after being modulated by the second acousto-optic modulator 4-2 controlled by the signal generator 2, generates a frequency of... Pulse width is The pulsed laser beam, after being reflected by the second mirror 11, undergoes beam shaping via the first 1319nm lens 5; wherein... ;

[0064] After being shaped by lenses, the two beams enter the solid-state amplification module 9 through the first coupling mirror 8. The timing difference between the two beams is significant. For example, if the repetition frequency of the two-band laser output is 300Hz, then the delay between the two pulses is adjusted to 1 / 600s, and the two beams enter the solid-state amplification module 9 one after the other.

[0065] Signal generator 2 provides a fixed operating frequency for solid-state amplifier module 9. By adjusting the delay of the synchronization signal, both beam pulses are positioned near the falling edge of the pump source of the solid-state amplifier module (either at the falling edge or within a set distance range) to ensure maximum extraction efficiency. After this setting, the repetition frequency is [value missing]. , The two beams of light can extract the energy of the same pump at different times, thereby realizing the asynchronous amplification of two wavelengths of light through the same solid-state amplification module 9;

[0066] After being amplified, the two beams of light are split by the first beam splitter 12. The delay control unit adjusts the delay of the two beams to achieve alignment of the two pulses when they reach the sum-frequency crystal 16. This achieves the nonlinear sum-frequency effect of the two beams to generate a single-frequency pulse of 589nm yellow light. The 589nm laser generated by the sum-frequency effect is split by the second beam splitter 17. The 589nm laser is reflected at 45°, while the 1319nm and 1064nm are transmitted horizontally.

[0067] Example 2: Solid-state amplifier module 9 is a pulsed LD end-face pump. The pump repetition frequency of the LD is fixed. The laser gain crystal is encapsulated in a high thermal conductivity copper heat sink by thermal welding and is cooled by water to ensure heat dissipation.

[0068] The 1064nm single-frequency continuous laser seed source, after being modulated by the first acousto-optic modulator 4-1 controlled by the signal generator 2, generates a frequency of... Pulse width is The pulsed laser, after being reflected by the first reflecting mirror 6, is shaped by the first 1064nm lens 7.

[0069] The 1319nm single-frequency continuous laser seed source, after being modulated by the second acousto-optic modulator 4-2 controlled by the signal generator 2, generates a frequency of... Pulse width is The pulsed laser beam, after being reflected by the second mirror 11, undergoes beam shaping via the first 1319nm lens 5; wherein... ;

[0070] After being shaped by lenses, the two beams pass through the first coupling mirror 8 and enter the solid-state amplification module 9, with the two beams having a timing difference. Second;

[0071] Signal generator 2 provides a fixed operating frequency for solid-state amplifier module 9. By adjusting the delay of the synchronization signal, both beam pulses are positioned near the falling edge of the pump source of the solid-state amplifier module (either at the falling edge or within a set distance range) to ensure maximum extraction efficiency. After this setting, the repetition frequency is [value missing]. , The two beams of light can extract the energy of the same pump at different times, thereby realizing the asynchronous amplification of two wavelengths of light through the same solid-state amplification module 9;

[0072] After being amplified, the two beams of light are split by a beam splitter. The delay control unit adjusts the delay of the two beams to align the two pulses when they reach the sum-frequency crystal 16. This achieves the nonlinear sum-frequency effect of the two beams to generate a single-frequency pulse of 589nm yellow light. The 589nm laser generated by the sum-frequency effect is split by the second beam splitter 17. The 589nm laser is reflected at 45°, while the 1319nm and 1064nm are transmitted horizontally.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser, characterized in that, a 1064 nm single-frequency continuous seed source, a first acousto-optic modulator, a first mirror and a first 1064 nm lens are sequentially arranged along an optical path, a 1319 nm single-frequency continuous seed source, a second acousto-optic modulator and a first 1319 nm lens are sequentially arranged along the optical path; a delay control unit and a signal generator are further included, the delay control unit is in communication connection with the signal generator, the signal generator is in communication connection with the first acousto-optic modulator and the second acousto-optic modulator respectively, the signal generator is used to set the relative delay of 1064 nm and 1319 nm signals according to the instruction of the delay control unit, and the delay control unit is used to regulate the delay of the two amplified lights through the second mirror and the third mirror to realize the alignment of the two lights when reaching the frequency doubling crystal; The first coupling mirror is used for receiving 1064nm pulse light output by the 1064nm lens and 1319nm pulse light output by the 1319nm lens, the same solid amplification module is used for receiving coupled light output by the first coupling mirror, the frequency of the 1064nm pulse light and the 1319nm pulse light is , and the time sequence is different by , so that the 1064nm pulse light and the 1319nm pulse light are located at a falling edge position of the pump source of the solid amplification module or the distance from the falling edge position is less than a set threshold, and the signal generator fixes the working frequency of the solid amplification module; the first beam splitter is used to receive the output light of the solid-state amplification module, the 1064 nm pulse light reflected by the first beam splitter is sequentially output to the second coupling mirror through the second mirror, the third mirror and the second 1064 nm lens; the 1319 nm pulse light transmitted by the first beam splitter is output to the second coupling mirror through the second 1319 nm lens, the second coupling mirror is used to output the coupled light to the frequency doubling crystal, the second beam splitter is used to receive the light output by the frequency doubling crystal, and the 589 nm laser is transmitted and output, and the 1064 nm fundamental frequency light and the 1319 nm fundamental frequency light are reflected and output. 2.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the solid-state amplification module includes a pump source and a gain crystal, the solid-state amplification module works in a pulse mode, and the pump signal of the solid-state amplification module is given by the signal generator. 3.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 2, characterized in that, the gain crystal is a Nd:YAG crystal. 4.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the first mirror, the second mirror and the third mirror are all 45° reflective to 1064 nm. 5.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the first coupling mirror, the first beam splitter and the second coupling mirror are all 45° reflective to 1064 nm and highly transmissive to 1319 nm. 6.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the frequency doubling crystal is an LBO frequency doubling crystal. 7.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the second beam splitter is 45° highly transmissive to 1064 nm and 1319 nm and reflective to 589 nm. 8.The dual-wavelength asynchronous common-cavity amplification and frequency 589 nm laser of claim 1, characterized in that, the solid-state amplification module adopts an end-pumping mode; or the solid-state amplification module adopts a side-pumping mode.

9. A method of generating 589 nm laser light, characterized by, The dual-wavelength asynchronous common-cavity amplification and frequency 589nm laser of any one of claims 1-8 comprises the following process: starting a 1064nm single-frequency continuous seed source to output continuous 1064nm single-frequency laser, the 1064nm single-frequency laser is incident to a first acousto-optic modulator along an optical path, after chopping processing by the first acousto-optic modulator, 1064nm pulsed laser with specific repetition frequency and pulse width is generated; the generated 1064nm pulsed laser is incident to a first mirror along an optical path, after adjusting the propagation direction by reflection of the first mirror, it is incident to a first 1064nm lens, the first 1064nm lens is used to perform spot shaping on the 1064nm pulsed laser and optimize the beam mode parameters; starting a 1319nm single-frequency continuous seed source to make it output continuous 1319nm single-frequency laser, the 1319nm single-frequency laser is incident to a second acousto-optic modulator along an optical path, after chopping processing by the second acousto-optic modulator, 1319nm pulsed laser with specific repetition frequency and pulse width is generated; the generated 1319nm pulsed laser is incident to a first 1319nm lens along an optical path, the first 1319nm lens is used to perform spot shaping on the 1319nm pulsed laser and optimize the beam mode parameters; the 1064nm pulsed laser shaped by the first 1064nm lens and the 1319nm pulsed laser shaped by the first 1319nm lens are incident to a first coupling mirror, the optical path coupling of the two lasers is completed by the first coupling mirror, forming coupled light and outputting to a solid amplification module; the coupled light output by the first coupling mirror is incident to the solid amplification module, the 1064nm pulsed laser and the 1319nm pulsed laser in the coupled light are amplified by the solid amplification module, obtaining amplified mixed coupled light; the mixed coupled light output by the solid amplification module is incident to a first beam splitter, the first beam splitter reflects the 1064nm laser and transmits the 1319nm laser, realizing the optical path separation of the two amplified lasers; the 1064nm laser reflected by the first beam splitter is incident to a second mirror and a third mirror along an optical path in turn, after adjusting the propagation direction by twice reflection, it is incident to a second 1064nm lens, the second 1064nm lens is used to reshape the spot again and optimize the subsequent coupling adaptation characteristics; the 1319nm laser transmitted by the first beam splitter is incident to a second 1319nm lens along an optical path, the second 1319nm lens is used to reshape the spot again and optimize the subsequent coupling adaptation characteristics; the 1064nm laser shaped by the second 1064nm lens and the 1319nm laser shaped by the second 1319nm lens are incident to a second coupling mirror, the optical path coupling of the two lasers is completed again by the second coupling mirror, forming coupled light adapted to the frequency mixing crystal and outputting to the frequency mixing crystal, the delay control unit adjusts the delay of the two beams by the second mirror and the third mirror, realizing the alignment of the two pulsed lights when they reach the frequency mixing crystal; The coupled light output by the second coupling mirror is incident to the sum frequency crystal, and 1064nm laser and 1319nm laser interact with each other in the sum frequency crystal through a nonlinear sum frequency effect to generate 589nm laser, and the light output by the sum frequency crystal contains 589nm laser, 1064nm fundamental frequency light not participating in the sum frequency, and 1319nm fundamental frequency light; The mixed light output by the sum frequency crystal is incident to the second beam splitter, the second beam splitter reflects 589nm laser and transmits 1064nm fundamental frequency light and 1319nm fundamental frequency light, and finally the target 589nm laser is reflected and output, and the fundamental frequency light not participating in the sum frequency is transmitted and separated.

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