A simulation inversion calculation method and system for single-pass loss of a Q-switched laser resonator

Abstract

The application discloses a Q-switched laser resonator single-pass loss simulation inversion calculation method and system, and belongs to the technical field of laser simulation. The method comprises the following steps: initializing basic parameters related to a resonator and a laser medium; calculating a laser threshold energy storage according to the basic parameters; calculating the energy storage of a laser crystal under different pump currents according to the laser threshold energy storage; calculating the output energy simulation value under each pump current according to the energy storage of the laser crystal; comparing the output energy simulation value with the actual measured value, and obtaining the final simulation result of the resonator single-pass loss according to the comparison result. The application does not need a large number of experimental tests, has low simulation error, is suitable for multiple pump working conditions, is applicable to the loss solving and performance optimization of various Q-switched solid-state lasers, and can significantly improve the laser design efficiency and simulation precision.

Description

Technical Field

[0001] This invention relates to the field of laser simulation and calculation technology, and in particular to a method and system for simulating and inverting the single-pass loss of a Q-switched laser resonator. Background Technology

[0002] Q-switched lasers, with their advantages of high peak power and narrow pulse width, are widely used in laser precision machining, lidar, scientific research and exploration, and medical aesthetics. The single-pass loss of the resonant cavity is a core parameter that determines the threshold energy storage, output energy, pulse width, and conversion efficiency of a Q-switched laser, directly affecting the overall performance of the laser.

[0003] The existing technology has the following drawbacks:

[0004] 1. Loss parameters largely depend on experimental measurements, requiring multiple setups of optical paths, component replacements, and collection of multiple sets of experimental data. This results in long measurement cycles, high costs, and susceptibility to the effects of experimental environment and assembly / adjustment precision, leading to poor repeatability of measurement results.

[0005] 2. Existing simulation methods mostly calculate single loss types such as diffraction loss and cavity mirror reflection loss, and have not established a full-link linkage calculation model of current-energy storage-threshold-output energy, which makes it impossible to realize the inverse solution of loss parameters and results in low simulation accuracy.

[0006] 3. It lacks the ability to simulate and adapt losses under different pump current conditions, which fails to meet the engineering requirements for laser performance prediction and parameter optimization under all operating conditions.

[0007] Therefore, there is an urgent need for a method and system for simulating and inverting the single-pass loss of a Q-switched laser resonator to solve the existing technical problems. Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a method and system for simulating and inverting the single-pass loss of a Q-switched laser resonator.

[0009] In a first aspect, embodiments of the present invention provide a method for simulating and inverting the single-pass loss of a Q-switched laser resonator, comprising:

[0010] Initialize the basic parameters related to the resonant cavity and laser medium;

[0011] Calculate the laser threshold energy storage based on the aforementioned basic parameters;

[0012] Based on the laser threshold energy storage, calculate the energy storage of the laser crystal under different pump currents;

[0013] Based on the energy stored in the laser crystal, the simulated output energy values ​​under each pump current are calculated.

[0014] The simulated output energy value is compared with the measured value, and the final simulation result of the single-pass loss of the resonant cavity is obtained based on the comparison result.

[0015] Furthermore, the basic parameters include the initial value L of other losses within the preset resonant cavity in a single pass, and the determined output mirror transmittance T and laser working material saturation energy density F. sat The cross-sectional area of ​​the working medium, A, and the threshold energy storage current, I, are also relevant. th .

[0016] Furthermore, based on the aforementioned basic parameters, the laser threshold energy storage is calculated. Specifically, this involves combining the laser oscillation condition formula with the single-pass threshold gain-threshold energy storage relationship formula to calculate the laser threshold energy storage.

[0017] Furthermore, the laser oscillation condition formula is as follows: The single-pass threshold gain-threshold energy storage relationship formula is as follows: Where L is the initial value of other losses within the preset resonant cavity in a single pass, and T is the transmittance of the output mirror. F is the threshold gain coefficient of the laser. sat Let A be the energy density and A be the cross-sectional area of ​​the working substance. For laser threshold storage.

[0018] Furthermore, based on the laser threshold energy storage and the energy storage-current linear correlation formula, the energy storage of the laser crystal under different pump currents is calculated; the energy storage-current linear correlation formula is as follows: ,in, For energy storage of laser crystals under different pump currents, For laser threshold storage, For different pump currents, The current corresponding to the threshold energy storage of the crystal.

[0019] Furthermore, based on the energy storage of the laser crystal, the stored energy under different currents is substituted into the Q-switched laser output energy formula to calculate the simulated output energy values ​​under each pump current; the Q-switched laser output energy formula is as follows: ,in, The output energy values ​​are simulated values ​​under various pump currents, where T is the transmittance of the output mirror and L is the initial value of other losses within the preset resonant cavity for a single pass. For energy storage of laser crystals under different pump currents, This represents the energy stored in the cavity corresponding to the laser threshold.

[0020] Furthermore, the simulated output energy value is compared with the measured value, and the final simulation result of the single-pass loss of the resonant cavity is obtained based on the comparison result. The specific method includes: comparing the simulated output energy value with the measured value; if the relative error exceeds the preset accuracy threshold, the other losses L in the single-pass cavity are iteratively corrected by the bisection method or gradient descent method, and the simulated output energy value under each pump current is repeatedly calculated until the deviation between the simulated value and the measured value meets the accuracy requirements.

[0021] Furthermore, the preset accuracy threshold is 1%, the range of L for iterative correction is 0.01~0.2, and the range of T for the output mirror transmittance is 0.1~0.8.

[0022] Secondly, this invention also discloses a simulation and inversion calculation system for the single-pass loss of a Q-switched laser resonator, comprising a basic parameter initialization unit, a laser threshold energy storage calculation unit, a laser crystal energy storage calculation unit, an output energy simulation value calculation unit, and a single-pass loss final simulation result calculation unit; wherein:

[0023] The basic parameter initialization unit is used to initialize various basic parameters related to the resonant cavity and laser medium.

[0024] A laser threshold energy storage calculation unit is used to calculate the laser threshold energy storage based on the aforementioned basic parameters.

[0025] The laser crystal energy storage calculation unit is used to calculate the energy storage of the laser crystal under different pump currents based on the laser's threshold energy storage.

[0026] The output energy simulation value calculation unit is used to calculate the output energy simulation value under each pump current based on the energy stored in the laser crystal.

[0027] The single-pass loss final simulation result calculation unit is used to compare the simulated value of the output energy with the measured value, and obtain the final simulation result of the single-pass loss of the resonant cavity based on the comparison result.

[0028] Thirdly, the present invention also discloses an electronic device, comprising:

[0029] One or more processors;

[0030] Memory, used to store one or more programs;

[0031] When the one or more programs are executed by the one or more processors, the one or more processors implement the computation method as described in any one of claims 1 to 8.

[0032] This invention discloses a method and system for simulating and inverting the single-pass loss of a Q-switched laser resonator. The method includes: initializing various basic parameters related to the resonator and the laser medium; calculating the laser threshold energy storage based on the basic parameters; calculating the energy storage of the laser crystal under different pump currents based on the laser threshold energy storage; calculating the simulated output energy value under each pump current based on the energy storage of the laser crystal; comparing the simulated output energy value with the measured value; and obtaining the final simulation result of the resonator's single-pass loss based on the comparison result. This invention requires no extensive experimental testing, has low simulation error, is adaptable to multiple pump conditions, and is suitable for loss solving and performance optimization of various Q-switched solid-state lasers, significantly improving laser design efficiency and simulation accuracy.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. No need for extensive experiments: Loss inversion can be completed with only a small amount of measured data, reducing testing costs and shortening the R&D cycle.

[0035] 2. Complete and accurate model: A full-link coupled model of current-energy storage-threshold-output is established to achieve high-precision loss inversion with an error better than 1%.

[0036] 3. Full operating condition adaptation: Supports continuous simulation under multiple pump currents, covering the entire operating range of the laser, and meets the needs of engineering parameter optimization. Attached Figure Description

[0037] Figure 1 A flowchart illustrating a method for simulating and inverting the single-pass loss of a Q-switched laser resonator according to an embodiment of the present invention;

[0038] Figure 2 A structural block diagram of a single-pass loss simulation and inversion calculation system for a Q-switched laser resonator cavity provided in an embodiment of the present invention;

[0039] Figure 3 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0041] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0042] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0043] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0045] In the technical solution of this invention, the collection, storage, use, processing, transmission, provision, and disclosure of user personal information all comply with relevant laws and regulations and do not violate public order and good morals. The use of user data in this technical solution follows relevant national laws and regulations (e.g., the "Information Security Technology - Personal Information Security Specification"). For example: appropriate measures are taken for personal information access control; restrictions are imposed on the display of personal information; the purpose of using personal information does not exceed the scope of direct or reasonable association; and explicit identity targeting is eliminated when using personal information to avoid precisely locating a specific individual.

[0046] To address at least one of the technical problems existing in the aforementioned related technologies, this invention provides a method and system for simulating and inverting the single-pass loss of a Q-switched laser resonator.

[0047] This embodiment discloses a method for simulating and inverting the single-pass loss of a Q-switched laser resonator, such as... Figure 1 ,include:

[0048] S100. Initialize the basic parameters related to the resonant cavity and laser medium; in this embodiment, the basic parameters include the preset initial value L of other losses in the single-pass cavity of the resonant cavity, and the determination of the output mirror transmittance T and the saturated energy density F of the laser working medium. satThe cross-sectional area of ​​the working medium, A, and the threshold energy storage current, I, are also relevant. th .

[0049] Among them, the initial value L of other losses within the resonant cavity during single-pass propagation of the laser is the inherent single-pass loss caused by diffraction, scattering, absorption, and mirror loss, excluding the output mirror coupling loss. The output mirror transmittance L is the proportion of light transmitted through the output coupling mirror of the laser resonant cavity to the oscillating laser within the cavity, serving as the core parameter for output coupling loss. The saturated energy density of the laser working medium is the saturated laser energy per unit area required to reduce the gain of the laser medium to half its original value when the laser medium experiences gain saturation under the influence of an optical field; it is a key parameter characterizing the gain saturation characteristics of the medium. The cross-sectional area A of the working medium is the effective working spot cross-sectional area of ​​the laser oscillating beam within the laser crystal / working medium. The crystal threshold energy storage corresponding current...

[0050] The pump threshold operating current is the current required to ensure that the laser working medium reaches the laser oscillation threshold energy storage.

[0051] S200. Calculate the laser threshold energy storage based on the aforementioned basic parameters. In this embodiment, the specific method for calculating the laser threshold energy storage based on the aforementioned basic parameters includes: combining the laser oscillation condition formula with the single-pass threshold gain-threshold energy storage relationship formula to calculate the laser threshold energy storage. The laser oscillation condition formula indicates that when the laser reaches the critical state of the oscillation threshold, the total round-trip gain within the cavity exactly compensates for all round-trip losses within the cavity, allowing the laser to maintain self-sustaining oscillation. The single-pass threshold gain-threshold energy storage relationship formula indicates that the single-pass threshold gain of the laser medium is directly proportional to the threshold energy storage of the medium and inversely proportional to the product of the saturated energy density and the effective spot cross-sectional area. This characterizes that the energy storage of the laser working medium directly determines its single-pass gain capability; the higher the energy storage, the greater the single-pass threshold gain.

[0052] Specifically, the formula for the laser oscillation condition is as follows: The single-pass threshold gain-threshold energy storage relationship formula is as follows: Combining the above formulas, we get Eth = 1 / 2AF sat (2L+T); where L is the initial value of other losses in the preset resonant cavity during a single pass, and T is the transmittance of the output mirror. F is the threshold gain coefficient of the laser. sat Let A be the energy density and A be the cross-sectional area of ​​the working substance. For laser threshold storage.

[0053] S300. Calculate the energy storage of the laser crystal under different pump currents based on the laser threshold energy storage; in this embodiment, the energy storage of the laser crystal under different pump currents is calculated based on the energy storage-current linear correlation formula, according to the laser threshold energy storage; the pump current is linearly proportional to the energy storage of the laser medium:

[0054] The linear correlation formula between energy storage and current indicates that the larger the pump current of the laser, the more reverse energy is accumulated in the working medium. Based on the threshold current and threshold energy storage, the actual energy stored in the cavity under any current can be calculated according to the actual pump current ratio.

[0055] In this embodiment, the energy storage-current linear correlation formula is: ,in, For energy storage of laser crystals under different pump currents, For laser threshold storage, For different pump currents, The current corresponding to the threshold energy storage of the crystal.

[0056] S400. Calculate the simulated output energy value under each pump current based on the energy stored in the laser crystal. In this embodiment, based on the energy stored in the laser crystal, the energy stored under different currents is substituted into the Q-switched laser output energy formula to calculate the simulated output energy value under each pump current. The Q-switched laser output energy formula represents the excess energy stored in the laser medium beyond the threshold, which is coupled and converted into Q-switched output laser energy according to the proportion of output loss to total loss.

[0057] In this embodiment, the formula for the output energy of the Q-switched laser is: ,in, The output energy values ​​are simulated values ​​under various pump currents, where T is the transmittance of the output mirror and L is the initial value of other losses within the preset resonant cavity for a single pass. For energy storage of laser crystals under different pump currents, This represents the energy stored in the cavity corresponding to the laser threshold.

[0058] S500 compares the simulated output energy value with the measured value, and obtains the final simulation result of the single-pass loss of the resonant cavity based on the comparison result.

[0059] In this embodiment, the simulated output energy value is compared with the measured value, and the final simulation result of the single-pass loss of the resonant cavity is obtained based on the comparison result. The specific method includes: comparing the simulated output energy value with the measured value; if the relative error exceeds the preset accuracy threshold, the other losses L in the single-pass cavity are iteratively corrected by the bisection method or the gradient descent method; the simulated output energy value under each pump current is repeatedly calculated until the deviation between the simulated value and the measured value meets the accuracy requirements.

[0060] In some preferred embodiments, the preset accuracy threshold is 1%, the value of L for iterative correction is in the range of 0.01 to 0.2, and the value of the output mirror transmittance T is in the range of 0.1 to 0.8.

[0061] In some preferred embodiments, the method is applicable to acousto-optic Q-switched solid-state lasers, where the laser gain medium is a gain crystal such as Nd:YAG or Nd:YVO4, and the saturation energy density is [not specified]. The value range is 0.5~1.5J / cm².

[0062] This embodiment discloses a method for simulating and inverting the single-pass loss of a Q-switched laser resonator. The method includes: initializing various basic parameters related to the resonator and the laser medium; calculating the laser threshold energy storage based on the basic parameters; calculating the energy storage of the laser crystal under different pump currents based on the laser threshold energy storage; calculating the simulated output energy value under each pump current based on the energy storage of the laser crystal; comparing the simulated output energy value with the measured value; and obtaining the final simulation result of the resonator single-pass loss based on the comparison result. This invention requires no extensive experimental testing, has low simulation error, is adaptable to multiple pump conditions, and is suitable for loss solving and performance optimization of various Q-switched solid-state lasers, significantly improving laser design efficiency and simulation accuracy.

[0063] To better understand this embodiment, for an Nd:YAG acousto-optic Q-switched laser, the method of this invention is used to perform single-pass loss simulation calculations, and the steps are as follows:

[0064] 1. Parameter initialization: Preset initial values ​​for other losses within the single-pass cavity: L=0.03, output mirror transmittance: T=0.1, Nd:YAG crystal saturation energy density. =0.8J / cm², crystal cross-sectional area A=0.25cm², threshold current It=10A;

[0065] 2. Threshold energy storage solution: The threshold energy storage Et = 0.06 J is obtained by solving the simultaneous formulas;

[0066] 3. Multi-condition energy storage calculation: For pump currents I=20A, 30A, and 40A, the energy storage values ​​E=0.12J, 0.18J, and 0.24J were calculated respectively;

[0067] 4. Output Energy Simulation: Substituting into the output energy formula, the simulated output energy values ​​for each current are 0.059J, 0.118J, and 0.177J, respectively.

[0068] 5. Loss Iteration Inversion: Compare the simulated values ​​with the measured values. The maximum relative error is 0.8%, which meets the 1% accuracy requirement. The final simulation result is determined to be the other losses in the single-pass cavity, L=0.03.

[0069] Based on the same inventive concept, embodiments of the present invention also provide a simulation and inversion calculation system for the single-pass loss of a Q-switched laser resonator, employing the aforementioned calculation method, such as... Figure 2 It includes a basic parameter initialization unit, a laser threshold energy storage calculation unit, a laser crystal energy storage calculation unit, an output energy simulation value calculation unit, and a single-pass loss final simulation result calculation unit; among which:

[0070] The basic parameter initialization unit is used to initialize various basic parameters related to the resonant cavity and laser medium.

[0071] A laser threshold energy storage calculation unit is used to calculate the laser threshold energy storage based on the aforementioned basic parameters.

[0072] The laser crystal energy storage calculation unit is used to calculate the energy storage of the laser crystal under different pump currents based on the laser's threshold energy storage.

[0073] The output energy simulation value calculation unit is used to calculate the output energy simulation value under each pump current based on the energy stored in the laser crystal.

[0074] The single-pass loss final simulation result calculation unit is used to compare the simulated value of the output energy with the measured value, and obtain the final simulation result of the single-pass loss of the resonant cavity based on the comparison result.

[0075] The specific working methods of the parameter initialization unit, laser threshold energy storage calculation unit, laser crystal energy storage calculation unit, output energy simulation value calculation unit, and single-pass loss final simulation result calculation unit have been described in detail in the above calculation methods, and will not be repeated here.

[0076] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 3 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 3 As shown, an embodiment of the present invention provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the computation methods described in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0077] The processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read / write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus).

[0078] In some embodiments, the processor 101, memory 102, and I / O interface 103 are interconnected via bus 104, and thus connected to other components of the computing device.

[0079] In some embodiments, the one or more processors 101 include a field-programmable gate array.

[0080] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the computation methods described in the above embodiments. The computer-readable storage medium may be volatile or non-volatile.

[0081] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described calculation method.

[0082] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0083] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0084] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0085] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0086] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0087] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0088] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0089] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0090] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0091] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A method for simulating and inverting the single-pass loss of a Q-switched laser resonator, characterized in that, include: Initialize the basic parameters related to the resonant cavity and laser medium; Calculate the laser threshold energy storage based on the aforementioned basic parameters; Based on the laser threshold energy storage, calculate the energy storage of the laser crystal under different pump currents; Based on the energy stored in the laser crystal, the simulated output energy values ​​under each pump current are calculated. The simulated output energy value is compared with the measured value, and the final simulation result of the single-pass loss of the resonant cavity is obtained based on the comparison result.

2. The calculation method according to claim 1, characterized in that, The basic parameters include the initial value L of other losses within the preset resonant cavity in a single pass, and the output mirror transmittance T and the saturated energy density F of the laser working material. sat The cross-sectional area of ​​the working medium, A, and the threshold energy storage current, I, are also relevant. th .

3. The calculation method according to claim 1, characterized in that, Based on the aforementioned basic parameters, the threshold energy storage of the laser is calculated. Specifically, the laser threshold energy storage is calculated by combining the laser oscillation condition formula with the single-pass threshold gain-threshold energy storage relationship formula.

4. The calculation method according to claim 3, characterized in that, The laser oscillation condition formula is: ; The formula for the single-pass threshold gain-threshold energy storage relationship is as follows: Where L is the initial value of other losses within the preset resonant cavity in a single pass, and T is the transmittance of the output mirror. F is the threshold gain coefficient of the laser. sat Let A be the energy density and A be the cross-sectional area of ​​the working substance. For laser threshold storage.

5. The calculation method according to claim 1, characterized in that, Based on the laser's threshold energy storage, and using the energy storage-current linear correlation formula, the energy storage of the laser crystal under different pump currents is calculated; the energy storage-current linear correlation formula is as follows: ,in, For energy storage of laser crystals under different pump currents, For laser threshold storage, For different pump currents, The current corresponding to the threshold energy storage of the crystal.

6. The calculation method according to claim 1, characterized in that, Based on the energy storage of the laser crystal, the energy stored under different currents is substituted into the Q-switched laser output energy formula to calculate the simulated output energy values ​​under each pump current; the Q-switched laser output energy formula is as follows: ,in, The output energy values ​​are simulated values ​​under various pump currents, where T is the transmittance of the output mirror and L is the initial value of other losses within the preset resonant cavity for a single pass. For energy storage of laser crystals under different pump currents, This represents the energy stored in the cavity corresponding to the laser threshold.

7. The calculation method according to claim 1, characterized in that, The simulated output energy value is compared with the measured value. Based on the comparison result, the final simulation result of the single-pass loss of the resonant cavity is obtained. The specific method includes: comparing the simulated output energy value with the measured value. If the relative error exceeds the preset accuracy threshold, the other losses L in the single-pass cavity are iteratively corrected by using the bisection method or gradient descent method. The simulated output energy value under each pump current is repeatedly calculated until the deviation between the simulated value and the measured value meets the accuracy requirements.

8. The calculation method according to claim 7, characterized in that, The preset accuracy threshold is 1%, the value of L for iterative correction is in the range of 0.01 to 0.2, and the value of the output mirror transmittance T is in the range of 0.1 to 0.

8.

9. A simulation and inversion calculation system for the single-pass loss of a Q-switched laser resonator, employing the calculation method described in any one of claims 1-8, characterized in that, It includes a basic parameter initialization unit, a laser threshold energy storage calculation unit, a laser crystal energy storage calculation unit, an output energy simulation value calculation unit, and a single-pass loss final simulation result calculation unit; among which: The basic parameter initialization unit is used to initialize various basic parameters related to the resonant cavity and laser medium. A laser threshold energy storage calculation unit is used to calculate the laser threshold energy storage based on the aforementioned basic parameters. The laser crystal energy storage calculation unit is used to calculate the energy storage of the laser crystal under different pump currents based on the laser's threshold energy storage. The output energy simulation value calculation unit is used to calculate the output energy simulation value under each pump current based on the energy stored in the laser crystal. The single-pass loss final simulation result calculation unit is used to compare the simulated value of the output energy with the measured value, and obtain the final simulation result of the single-pass loss of the resonant cavity based on the comparison result.

10. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the computation method as described in any one of claims 1 to 8.

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