Terahertz laser resonant cavity small hole design method and device and computing equipment

Abstract

The invention discloses a terahertz laser resonant cavity small hole design method, a terahertz laser resonant cavity small hole design device and computing equipment, relates to the field of terahertz laser, and aims to solve the problems that in the prior art, when a terahertz laser resonant cavity is designed, the size of an output coupling mirror small hole needs to be selected through a large number of experiments, the efficiency is extremely low, and the selected small hole size is not the optimal size often. Simulation is carried out according to a terahertz laser kinetic model, the optimal output coupling rate of the terahertz laser resonant cavity is obtained, an input coupling mirror of the resonant cavity is a plane mirror, an output coupling mirror is a curved surface mirror, one end, with a smaller aperture, of a horn-shaped small hole faces the interior of the terahertz laser resonant cavity, and the other end of the horn-shaped small hole faces the interior of the terahertz laser resonant cavity. The input coupling mirror and the output coupling mirror are coaxially arranged; and determining the size of the small hole of the output coupling mirror according to the optimal output coupling rate in combination with the light intensity distribution condition of the terahertz laser spots, thereby completing the design of the small hole of the terahertz laser resonant cavity.

Description

Technical Field

[0001] The present invention relates to the field of terahertz lasers, and in particular to the design of a terahertz laser resonant cavity. Background Art

[0002] Optically pumped gas terahertz (also known as THz) lasers are one of the main methods for generating THz waves. Their resonant cavities usually use pinhole coupling to achieve pump light input and THz laser output. Pinhole-coupled resonators have the advantages of high pump coupling efficiency and simple structure. The pinhole size of their output coupling mirrors directly affects the output power of the THz laser. When designing the resonant cavity parameters, output coupling mirrors with different pinhole sizes are usually selected based on experience and experiments are conducted. The optimal pinhole size is selected based on the terahertz laser output power corresponding to different pinhole sizes. For example, the pinhole size with the highest terahertz laser output power is selected. This method not only requires repeated experiments, is time-consuming and labor-intensive, and has low efficiency, but the pinhole size ultimately selected is often close to the optimal size, but is not necessarily the optimal size.

[0003] Therefore, a method is needed to provide a suitable aperture size of the output coupling mirror according to the power requirement when designing a terahertz laser resonant cavity. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, a large number of experiments are required to select the output coupling mirror aperture size when designing a terahertz laser resonant cavity, which is extremely inefficient and the selected aperture size is often not the optimal size. A terahertz laser resonant cavity aperture design method, device and computing equipment are provided to solve the problem that in the prior art, a large number of experiments are required to select the output coupling mirror aperture size, which is extremely inefficient and the selected aperture size is often not the optimal size.

[0005] In a first aspect, an embodiment of the present application provides a method for designing a terahertz laser resonant cavity aperture, comprising: performing simulation according to a terahertz laser dynamics model to obtain an optimal output coupling rate of the terahertz laser resonant cavity, wherein the terahertz laser resonant cavity comprises an input coupling mirror with a horn-shaped aperture at the center, an output coupling mirror with a horn-shaped aperture at the center, and a waveguide tube; the input coupling mirror is a plane reflector, and the output coupling mirror is a curved reflector; the input coupling mirror and the output coupling mirror are respectively located at two ends of the waveguide tube, with the end with a smaller aperture of the horn-shaped aperture facing the interior of the terahertz laser resonant cavity, and the input coupling mirror, the output coupling mirror, and the waveguide tube are coaxially arranged; and determining the aperture size of the output coupling mirror according to the optimal output coupling rate and in combination with the light intensity distribution of the terahertz laser spot, thereby completing the design of the terahertz laser resonant cavity aperture.

[0006] Optionally, the optimal output coupling rate is the output coupling rate of the output coupling mirror when the output power of the terahertz laser resonant cavity is the highest.

[0007] Optionally, the aperture radius of the output coupling mirror corresponding to the optimal output coupling ratio is: Wherein, δ is the optimal output coupling rate of the terahertz laser resonant cavity, and z2 is the equivalent confocal cavity parameter of the terahertz laser resonant cavity.

[0008] The second aspect of the present application also provides a terahertz laser resonant cavity aperture design device, including: an optimal output coupling rate calculation unit, suitable for performing simulation according to a terahertz laser dynamics model to obtain the optimal output coupling rate of the terahertz laser resonant cavity, the terahertz laser resonant cavity including an input coupling mirror with a horn-shaped aperture in the center, an output coupling mirror with a horn-shaped aperture in the center, and a waveguide; the input coupling mirror is a plane reflector, and the output coupling mirror is a curved reflector; the input coupling mirror and the output coupling mirror are respectively located at both ends of the waveguide, the end with the smaller aperture of the horn-shaped aperture faces the interior of the terahertz laser resonant cavity, and the input coupling mirror, the output coupling mirror and the waveguide are coaxially arranged; and a pinhole size calculation unit, suitable for determining the pinhole size of the output coupling mirror according to the optimal output coupling rate and in combination with the light intensity distribution of the terahertz laser spot, to complete the design of the terahertz laser resonant cavity aperture.

[0009] Optionally, the optimal output coupling rate is the output coupling rate of the output coupling mirror when the output power of the terahertz laser resonant cavity is the highest.

[0010] Optionally, the aperture radius of the output coupling mirror corresponding to the optimal output coupling ratio is: Wherein, δ is the optimal output coupling rate of the terahertz laser resonant cavity, and z2 is the equivalent confocal cavity parameter of the terahertz laser resonant cavity.

[0011] The third aspect of the present application also provides an electronic device, comprising: at least one processor and a memory storing a computer program; when the computer program is read and executed by the processor, the electronic device executes the above-mentioned terahertz laser resonant cavity aperture design method.

[0012] The fourth aspect of the present application also provides a readable storage medium storing a computer program. When the computer program is read and executed by an electronic device, the electronic device executes the above-mentioned terahertz laser resonant cavity aperture design method.

[0013] The present invention's terahertz laser resonator aperture design method, device, and computing equipment utilize a terahertz laser dynamics model to determine the optimal output coupling ratio. The power distribution of the terahertz laser spot determines the relationship between the optimal output coupling ratio and the output coupling mirror aperture size. Based on this relationship, the output coupling mirror aperture radius corresponding to the optimal output coupling ratio is determined. This method eliminates the need for experimentally determining aperture size, resulting in high efficiency and a designed aperture size that maximizes terahertz laser output power, effectively improving the conversion efficiency of terahertz lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic flow chart of a method for designing a terahertz laser resonant cavity aperture according to an embodiment of the present application;

[0015] Figure 2 is a schematic structural diagram of a terahertz laser resonant cavity according to an embodiment of the present application;

[0016] Figure 3 is a normalized distribution diagram of the terahertz laser light intensity on the terahertz laser resonant cavity mirror according to an embodiment of the present application, wherein (a) is the light intensity distribution diagram on the input coupling mirror, and (b) is the light intensity distribution diagram on the output coupling mirror;

[0017] Figure 4 is a normalized optical power distribution diagram of a Gaussian beam spot on a terahertz cavity mirror according to an embodiment of the present application;

[0018] Figure 5 is a normalized optical power distribution diagram of a Gaussian beam spot on a terahertz cavity mirror according to an embodiment of the present application;

[0019] Figure 6 2 is a schematic structural diagram of a defocusing cavity (L<R / 2) according to an embodiment of the present application;

[0020] Figure 7 is a schematic structural diagram of another defocusing cavity (L>R / 2) according to an embodiment of the present application;

[0021] Figure 8 is a graph showing the relationship between the aperture radius of the output coupling mirror and the output coupling efficiency of the terahertz laser according to an embodiment of the present application;

[0022] Figure 9 Schematic diagram of the structure of a terahertz laser resonant cavity aperture design device according to an embodiment of the present application;

[0023] Figure 10 Schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0025] As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0026] In view of the problem that the existing technology cannot determine the aperture size of the output coupling mirror of the terahertz laser resonator according to the power requirement, the present invention provides a terahertz laser resonator aperture design method. The method determines the aperture size of the output coupling mirror of the terahertz laser resonator so that the output power of the terahertz laser resonator meets the requirement.

[0027] The terahertz laser resonant cavity aperture design method of the embodiment of the present application includes: performing simulation based on a terahertz laser dynamics model to obtain the optimal output coupling rate of the terahertz laser resonant cavity; and determining the aperture size of the output coupling mirror based on the optimal output coupling rate and combined with the light intensity distribution of the light spot to complete the design of the terahertz laser resonant cavity aperture.

[0028] Figure 1 FIG. 1 is a schematic flow chart of a method for designing a small hole in a terahertz laser resonant cavity according to an embodiment of the present application. Figure 1 As shown, the method starts at step S110.

[0029] In step S110 , simulation is performed according to a terahertz laser dynamics model to obtain an optimal output coupling ratio of the terahertz laser resonant cavity.

[0030] like Figure 2As shown, the terahertz laser resonator of the present embodiment primarily comprises an input coupling mirror 1 with a central trumpet-shaped aperture and an output coupling mirror 2 with a central trumpet-shaped aperture. The input coupling mirror 1 is flat on both sides, while the output coupling mirror 2 has a flat surface on one side and a concave surface on the other, with the concave surface facing the cavity. The input coupling mirror 1 and the output coupling mirror 2 are located at either end of a waveguide 3, with the smaller ends of the trumpet-shaped apertures facing the cavity. The input coupling mirror 1, the output coupling mirror 2, the two trumpet-shaped apertures, and the waveguide 3 are coaxial.

[0031] The smaller the aperture size of the output coupling mirror 2, the lower the output coupling efficiency of the resonant cavity; the larger the aperture size of the output coupling mirror 2, the higher the output coupling efficiency of the resonant cavity. The output coupling efficiency of the THz laser resonant cavity directly affects the output power of the THz laser. Therefore, when other parameters of the resonant cavity are fixed, the output coupling efficiency of the THz laser resonant cavity is determined by the aperture size at the center of the output coupling mirror 2.

[0032] When designing the resonant cavity, the chemical composition of the gain gas needs to be determined, and the following parameters also need to be determined:

[0033] 1. Environmental parameters such as the pressure and temperature of the gain gas in the resonant cavity;

[0034] 2. Structural parameters such as the light leakage rate of the input coupling mirror 1, the curvature radius of the output coupling mirror 2, the light leakage rate of the output coupling mirror 2 (also known as the output coupling rate), the average single-pass loss factor, the reflectivity of the output coupling mirror 2 to the pump laser, and the cavity length;

[0035] 3. Pump parameters such as pump laser wavelength, beam waist position, beam waist size, beam divergence angle, and pump laser power.

[0036] The above parameters are input into the terahertz laser dynamics model to obtain the output power of the terahertz laser under different output coupling rates.

[0037] Usually, the output coupling ratio of the output coupling mirror corresponding to the highest terahertz laser output power is taken as the optimal output coupling ratio.

[0038] Next, in step S120 , the aperture size of the output coupling mirror is determined according to the optimal output coupling ratio and in combination with the light intensity distribution of the terahertz laser spot, thereby completing the design of the aperture of the terahertz laser resonant cavity.

[0039] The cavity length of the above-mentioned terahertz laser resonant cavity is L, and the curvature radius of the concave surface of the output coupling mirror 2 is R. When L=R / 2, the resonant cavity is a semi-confocal cavity, and when L≠R / 2, the resonant cavity is a defocused cavity.

[0040] The terahertz laser in the resonant cavity is approximately a fundamental mode Gaussian beam, with the beam waist located at the input coupling mirror 1. The propagation direction of the Gaussian beam is defined as the z-axis, and the position of the beam waist is z = 0, so the input coupling mirror 1 is located at z = 0. The calculation formula for the Gaussian beam waist spot radius ω0 is:

[0041]

[0042] Where λ is the wavelength of the THz laser, and f represents the focal length of the equivalent confocal cavity of the resonant cavity.

[0043] For a fundamental mode Gaussian beam propagating along the z-axis, the transformation formula of its spot radius ω(z) is:

[0044]

[0045] Where z represents the propagation distance of the Gaussian beam.

[0046] In order to determine the Gaussian beam propagation of the THz laser in the cavity and the intensity distribution of the spot at different positions on the z-axis, it is first necessary to calculate the equivalent confocal cavity parameters (z1, z1, f) of the resonant cavity:

[0047]

[0048] Wherein, R1 is the curvature radius of the input coupling mirror 1, and R2 is the curvature radius of the output coupling mirror 2. In the embodiment of the present application, R1 = +∞, and R2 = R.

[0049] If the resonant cavity is a semi-confocal cavity, the focal length of its equivalent confocal cavity is calculated to be f = R / 2. Therefore, the spot radius of the Gaussian beam propagating to the output coupling mirror 2 is The lateral (xy plane) distribution of light intensity at the positions of input coupling mirror 1 and output coupling mirror 2 satisfies the Gaussian distribution, and the light intensity distribution function is as follows:

[0050]

[0051] Where I(x,y,z) represents the light intensity at the position (x,y,z), and I0 is the light intensity at the center of the light spot (x=0,y=0).

[0052] Taking the curvature radius R = 2.5 m of the output coupling mirror 2 as an example, the normalized distribution of the light intensity on the input coupling mirror 1 and the output coupling mirror 2 can be obtained from formula (4) as follows: Figure 3 (a) and Figure 3 As shown in (b). Since the Gaussian distribution is a symmetrical distribution, the normalized function of the light intensity distribution can be simplified to the distribution function of its optical power:

[0053]

[0054] Where ω(z) is the spot radius, which refers to the time it takes for the light intensity to drop from the maximum value to 1 / e 2 The corresponding size when . Formula (5) can be used to obtain the ratio of the power value of the light spot in the pinhole area on the output coupling mirror 2 to the total power value, thereby obtaining the relationship between the pinhole size and the output coupling rate. The specific calculation method is as follows:

[0055] From formula (5), we can know that the normalized distribution of the optical power of the terahertz spot on the output coupling mirror 2 is as follows: Figure 4 As shown in the figure, the actual power of the terahertz spot is the integral of the rotation body obtained by rotating around the vertical axis (r = 0) from 0 to infinity, that is, the volume. Therefore, when the spot size is r, the volume of the rotation body is obtained by calculating the optical power P a for:

[0056]

[0057] Consider P r When the maximum value drops to a, the corresponding r value is r a , size r a The Gaussian beam area occupied by the spot is as follows Figure 5 As shown. r =a、r=r a Substituting into formula (5), we can derive:

[0058]

[0059] Substituting formula (7) into formula (6), we get the spot size r a The spot light power P a :

[0060]

[0061] When the spot size of the Gaussian beam approaches infinity, a approaches 0, and the total power P of the Gaussian beam s for:

[0062]

[0063] Therefore, the radius of the concentric circular hole area of ​​the Gaussian beam can be obtained as r a When , the ratio of the optical power on the terahertz laser spot in the concentric hole area to the total power is the output coupling rate δ of the output coupling mirror. According to formula (8) and formula (9), it can be known that:

[0064]

[0065] Step S110 obtains the optimal δ value. According to formula (10) and formula (7), the aperture radius of the output coupling mirror 2 is obtained as

[0066] Taking the semi-confocal cavity with the output coupling mirror 2 having a curvature radius R = 2.5 m and a cavity length L = 1.25 m as an example, the relationship between the aperture size and the output coupling rate is as follows: Figure 8 As shown in curve a.

[0067] If the resonant cavity is Figure 6 (L<R / 2) or Figure 7 (L>R / 2) shows the defocus cavity, calculate the parameters z1, z1 and f of the equivalent semi-confocal cavity corresponding to the defocus cavity, and obtain the position and curvature radius of the input coupling mirror and output coupling mirror of the equivalent confocal cavity. Figure 6 and Figure 7 In the example, the resonant cavity is composed of cavity mirrors M1 and M2, with M1 serving as the input coupling mirror and M2 as the output coupling mirror. The equivalent confocal cavity of this resonant cavity is composed of cavity mirrors M1 and M3. The Gaussian beam spot size on cavity mirror M2 can be obtained from formula (2). Furthermore, formula (5) can be used to calculate the ratio of the optical power value within the aperture range to the total power value, thereby obtaining the relationship between the aperture size and the output coupling rate.

[0068] According to the above calculation method, for the defocus cavity with L<R / 2, the curvature radius R=2.5m, the cavity length L=1.1m, and the equivalent confocal cavity z1=0m, z2=1.1m, f=1.241m are calculated. The relationship curve between the aperture radius and the output coupling rate is as follows: Figure 8 As shown in curve b. For the defocus cavity with L>R / 2, the curvature radius R=2.5m, the cavity length L=1.4m, and the calculated equivalent confocal cavity z1=0m, z2=1.4m, f=1.241m, the relationship curve between the aperture radius and the coupling rate is shown as follows Figure 8 As shown in curve c.

[0069] The terahertz laser resonant cavity aperture design method of the embodiment of the present application can determine the size of the resonant cavity output coupling mirror aperture based on other parameters of the resonant cavity and power requirements. Compared with the traditional method of selecting the aperture size through experiments, the method of the embodiment of the present application is highly efficient, and the aperture size determined can maximize the output power.

[0070] Terahertz lasers are tunable lasers, and the wavelength of terahertz lasers can be changed by changing the parameters of the terahertz laser pump light. However, for a terahertz laser, the aperture size of its output coupling mirror is fixed, and the output power of different terahertz laser wavelengths under this aperture size is different. Based on the relationship between the aperture radius and the output coupling rate, the output power of a specific wavelength of the terahertz laser can be calculated by combining the above formulas (10), (8), (3), (2), and (1) to determine whether the terahertz laser power of the above specific wavelength output by the terahertz laser meets the requirements.

[0071] The present application also provides a terahertz laser resonant cavity aperture design device. Figure 9 As shown, the device includes an optimal output coupling rate calculation unit 910 and a small hole size calculation unit 920.

[0072] The optimal output coupling rate calculation unit 910 is suitable for performing simulation according to the terahertz laser dynamics model to obtain the optimal output coupling rate of the terahertz laser resonant cavity, wherein the terahertz laser resonant cavity includes an input coupling mirror 1 with a horn-shaped small hole in the center, an output coupling mirror 2 with a horn-shaped small hole in the center, and a waveguide tube 3; the input coupling mirror 1 is a plane reflector, and the output coupling mirror 2 is a curved reflector; the input coupling mirror 1 and the output coupling mirror 2 are respectively located at both ends of the waveguide tube 3, and the end with the smaller aperture of the horn-shaped small hole faces the interior of the terahertz laser resonant cavity, and the input coupling mirror 1, the output coupling mirror 2 and the waveguide tube 3 are coaxially arranged.

[0073] The aperture size calculation unit 920 is adapted to determine the aperture size of the output coupling mirror according to the optimal output coupling ratio and in combination with the light intensity distribution of the terahertz laser spot, thereby completing the design of the aperture of the terahertz laser resonant cavity.

[0074] As a preferred embodiment of the present application, the optimal output coupling rate is the output coupling rate of the output coupling mirror 2 when the output power of the terahertz laser resonant cavity is the highest.

[0075] As a preferred embodiment of the present application, the aperture radius of the output coupling mirror corresponding to the optimal output coupling rate is:

[0076]

[0077] Wherein, δ is the optimal output coupling rate of the terahertz laser resonant cavity, and z2 is the equivalent confocal cavity parameter of the terahertz laser resonant cavity.

[0078] The terahertz laser resonant cavity aperture design device of the embodiment of the present application can realize the processing of each step of the above-mentioned terahertz laser resonant cavity aperture design method. Its principle and effect are the same as those of the terahertz laser resonant cavity aperture design method, and will not be repeated here.

[0079] The present application also provides an electronic device. The terahertz laser resonator aperture design method of the present application is performed in an electronic device. The electronic device can be any device with storage and computing capabilities, such as a server, workstation, or personal computer such as a desktop or laptop computer, or a terminal device such as a mobile phone, tablet computer, smart wearable device, or IoT device, but is not limited thereto.

[0080] Figure 10 FIG1 shows a schematic diagram of an electronic device according to an embodiment of the present invention. It should be noted that, Figure 10 The electronic device shown is only an example. In practice, the electronic device used to implement the terahertz laser resonant cavity aperture design method of the present invention can be any type of device, and its hardware configuration can be the same as Figure 10 The electronics shown are the same and can also be used with Figure 10 In practice, the electronic device used to implement the terahertz laser resonant cavity aperture design method of the present invention can be Figure 10 The hardware components of the electronic device shown may be added or deleted, and the present invention does not limit the specific hardware configuration of the electronic device.

[0081] like Figure 10 As shown, the electronic device typically includes a memory 1010 and one or more processors 1020. A bus 1030 can be used for communication between the processor 1020 and the memory 1010. The processor 1020 can be any type of processor, including but not limited to a microprocessor, a microcontroller, a digital information processor, or any combination thereof. The memory 1010 can be any type of memory, including but not limited to a volatile memory (such as RAM), a non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof.

[0082] The memory 1010 stores instructions of a computer program 1040 , which can instruct the processor 1020 to execute the method for designing a terahertz laser resonant cavity aperture of the present invention.

[0083] The various techniques described herein may be implemented in conjunction with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions of the methods and apparatus of the present invention, may be implemented in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a removable hard disk, a USB flash drive, a floppy disk, a CD-ROM, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes an apparatus for practicing the present invention.

[0084] The above embodiments should be considered as a way of explaining the present invention. After reading and understanding the contents described in the present invention, those skilled in the art may make various reasonable changes or modifications to the present invention as needed. These changes or modifications, as long as they are based on the principle of equivalents, should be considered to be included in the scope of protection defined by the claims of the present invention. Therefore, the scope of protection of the present invention is not limited to the contents specifically described in the above embodiments, but covers all changes and modifications that are identical or equivalent to the principles of the present invention.

Claims

1. A method for designing a small hole in a terahertz laser resonant cavity, characterized in that: include: A simulation is performed based on a terahertz laser dynamics model to obtain an optimal output coupling rate of a terahertz laser resonant cavity, wherein the terahertz laser resonant cavity includes an input coupling mirror with a trumpet-shaped aperture at the center, an output coupling mirror with a trumpet-shaped aperture at the center, and a waveguide; the input coupling mirror is a plane reflector, and the output coupling mirror is a curved reflector; the input coupling mirror and the output coupling mirror are respectively located at two ends of the waveguide, with the end of the trumpet-shaped aperture with a smaller aperture facing the interior of the terahertz laser resonant cavity, and the input coupling mirror, the output coupling mirror, and the waveguide are coaxially arranged; and The aperture size of the output coupling mirror is determined according to the optimal output coupling ratio and in combination with the light intensity distribution of the terahertz laser spot, thereby completing the design of the aperture of the terahertz laser resonant cavity.

2. The method according to claim 1, wherein The optimal output coupling rate is the output coupling rate of the output coupling mirror when the output power of the terahertz laser resonant cavity is the highest.

3. The method according to claim 1 or 2, wherein: The aperture radius of the output coupling mirror corresponding to the optimal output coupling rate is: Wherein, δ is the optimal output coupling rate of the terahertz laser resonant cavity, and z2 is the equivalent confocal cavity parameter of the terahertz laser resonant cavity.

4. A terahertz laser resonant cavity aperture design device, characterized in that: include: an optimal output coupling rate calculation unit, adapted to perform simulation according to a terahertz laser dynamics model to obtain an optimal output coupling rate of a terahertz laser resonant cavity, wherein the terahertz laser resonant cavity comprises an input coupling mirror having a horn-shaped aperture at the center, an output coupling mirror having a horn-shaped aperture at the center, and a waveguide; the input coupling mirror is a plane reflector, and the output coupling mirror is a curved reflector; the input coupling mirror and the output coupling mirror are respectively located at two ends of the waveguide, with the end of the horn-shaped aperture having a smaller aperture facing the interior of the terahertz laser resonant cavity, and the input coupling mirror, the output coupling mirror, and the waveguide are coaxially arranged; and The pinhole size calculation unit is adapted to determine the pinhole size of the output coupling mirror according to the optimal output coupling ratio and in combination with the light intensity distribution of the terahertz laser spot, thereby completing the design of the pinhole of the terahertz laser resonant cavity.

5. The device according to claim 4, characterized in that The optimal output coupling rate is the output coupling rate of the output coupling mirror when the output power of the terahertz laser resonant cavity is the highest.

6. The device according to claim 4 or 5, characterized in that The aperture radius of the output coupling mirror corresponding to the optimal output coupling rate is: Wherein, δ is the optimal output coupling rate of the terahertz laser resonant cavity, and z2 is the equivalent confocal cavity parameter of the terahertz laser resonant cavity.

7. An electronic device, characterized in that: include: Memory; processor; as well as computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the method according to any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that A computer program is stored thereon; the computer program is executed by a processor to implement the method according to any one of claims 1 to 3.

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