A method for constructing a vibration and temperature insensitive super-stable cavity and a super-stable cavity

Abstract

The application discloses a vibration and temperature insensitive super-stable cavity construction method and a super-stable cavity. The method comprises the following steps: establishing an initial super-stable cavity model based on initial model parameters; performing mechanical finite element simulation on the initial super-stable cavity model to establish a low-vibration-sensitivity super-stable cavity model; performing thermal finite element simulation on the low-vibration-sensitivity super-stable cavity model, determining required compensation ring parameters according to a target zero-expansion temperature point, and constructing a zero-expansion-point-adjustable super-stable cavity model; after the obtained zero-expansion-point-adjustable super-stable cavity model is sequentially subjected to verification and adjustment of mechanical finite element simulation and thermal finite element simulation, a fixed clamping support structure of the super-stable cavity model is constructed; after the constructed support structure is subjected to verification and adjustment of mechanical finite element simulation, a target super-stable cavity is generated. The super-stable cavity with a target vibration sensitivity and a target zero-expansion temperature point is realized, the fixed clamping support structure is portable and movable, operation is convenient, and the super-stable cavity has high practicability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of super-stable cavities, and more particularly relates to a vibration- and temperature-insensitive super-stable cavity construction method and a super-stable cavity. BACKGROUND

[0002] Due to high frequency stability and narrow linewidth, super-stable lasers have applications in gravitational wave detection, fundamental physics testing, optical frequency standards, and many other fields. There are many methods to obtain super-stable lasers, among which the most common one is to lock a free-running laser to the resonance frequency of a Fabry-Perot cavity, i.e., a super-stable cavity, by the PDH (Pound-Drever-Hall) method.

[0003] At present, most super-stable cavities used in laboratories use commercial cavities, the temperature at the zero-expansion point of which is determined, and the cavities are installed by relying on their own gravity in a non-fastening manner, and are subjected to strict temperature control so as to work at the zero-expansion point of the super-stable cavity to reduce thermal expansion of the cavity and frequency drift.

[0004] The super-stable cavities used in laboratories have the disadvantages of inconvenient transportation due to non-fixed installation, and large system volume, power consumption, and weight. With the development of super-stable lasers towards miniaturization, portability, and space application, in order to facilitate transportation, the super-stable cavity needs to adopt a completely fixed support structure, while still ensuring low vibration sensitivity. Due to the limitation of the volume and power consumption of the temperature control system in portable environments and space application environments, the zero-expansion temperature point of the cavity needs to be adjusted to the ambient temperature to reduce the power consumption requirement of the temperature control system. SUMMARY

[0005] In view of the defects of the related art, the purpose of the present application is to provide a vibration- and temperature-insensitive super-stable cavity construction method and a super-stable cavity, aiming to solve the problems of large volume and power consumption limitation of the temperature control system of the existing super-stable cavity and limited application scenarios.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present application provides a vibration- and temperature-insensitive super-stable cavity construction method, comprising:

[0007] establishing an initial super-stable cavity model based on preliminary model parameters;

[0008] performing mechanical finite element simulation on the initial super-stable cavity model to establish a low-vibration-sensitivity super-stable cavity model;

[0009] performing thermal finite element simulation on the low-vibration-sensitivity super-stable cavity model, determining the required compensation ring parameters according to a target zero-expansion temperature point, and constructing a zero-expansion-point-adjustable super-stable cavity model;

[0010] After the obtained zero-expansion-point adjustable super-stable cavity model is verified and adjusted through mechanical finite element simulation, a fixed clamping support structure of the super-stable cavity model is constructed.

[0011] After the constructed support structure is verified and adjusted through mechanical finite element simulation, a target super-stable cavity is generated.

[0012] Optionally, the mechanical finite element simulation on the initial super-stable cavity model to establish a low-vibration-sensitivity super-stable cavity model comprises:

[0013] Material properties corresponding to each part of the initial super-stable cavity model are given.

[0014] A mechanical physical field is constructed, and a model grid conforming to the initial super-stable cavity model is selected.

[0015] All parameters in the initial super-stable cavity model are subjected to parametric scanning, the parameters are simulated according to the order of influence on vibration sensitivity, and the minimum solution of the displacement corresponding to each parameter is obtained.

[0016] The sizes of each parameter of the low-vibration-sensitivity super-stable cavity model are obtained, and a low-vibration-sensitivity super-stable cavity model is constructed.

[0017] Optionally, the material properties corresponding to each part of the initial super-stable cavity model are given, comprising:

[0018] The density, Poisson's ratio and Young's modulus of each component of the initial super-stable cavity model are valued.

[0019] Optionally, all parameters in the initial super-stable cavity model include the thickness, radius and distance from the center of the cavity of each component of the initial super-stable cavity model.

[0020] Optionally, the thermal finite element simulation on the low-vibration-sensitivity super-stable cavity model is performed, the required compensation ring parameters are determined according to the target zero-expansion temperature point, and a zero-expansion-point adjustable super-stable cavity model is constructed, comprising:

[0021] Material properties corresponding to each part of the low-vibration-sensitivity super-stable cavity model are given.

[0022] A thermal physical field is constructed, and a model grid conforming to the low-vibration-sensitivity super-stable cavity model is selected.

[0023] The thickness and inner diameter of the compensation ring in the low-vibration-sensitivity super-stable cavity model are subjected to parametric scanning, and the target zero-expansion-point temperature is calculated according to the target environmental temperature.

[0024] Obtaining the compensation ring size corresponding to the zero expansion point temperature, and constructing a corresponding zero expansion point adjustable super-stable cavity model according to the obtained compensation ring size.

[0025] Optionally, the material of each part of the low-vibration-sensitivity super-stable cavity model is endowed with a corresponding material attribute, including:

[0026] The thermal expansion coefficient, density, Poisson's ratio and Young's modulus of each component of the low-vibration-sensitivity super-stable cavity model are valued.

[0027] Optionally, the obtained zero expansion point adjustable super-stable cavity model is sequentially subjected to verification and adjustment of mechanical finite element simulation and thermal finite element simulation, and a fixed clamping support structure of the super-stable cavity model is constructed.

[0028] The obtained zero expansion point adjustable super-stable cavity model is sequentially subjected to repeated iteration calculation of mechanical finite element simulation and thermal finite element simulation, parameters are adjusted to be within a preset range, and a corrected zero expansion point adjustable super-stable cavity model is generated.

[0029] Six support columns are set, and the corrected super-stable cavity model is subjected to mechanical finite element simulation to calculate the parameters of the support columns.

[0030] A super-stable cavity fixed clamping support structure is constructed according to the parameters of the support columns.

[0031] Optionally, the initial super-stable cavity model is established based on the preliminary model parameters, including:

[0032] Preliminary model parameters are obtained according to investigation data, preliminary thermal simulation and cavity length calculation.

[0033] Any one of a square cavity, a spherical cavity, a conical cavity and a double tetrahedron cavity is selected as a cavity shape in the initial model, and an initial super-stable cavity model is established in combination with the preliminary model parameters.

[0034] In a second aspect, the present application further provides a vibration and temperature insensitive super-stable cavity, which is constructed according to the super-stable cavity construction method of any one of the first aspect, and includes a cavity, a support ring, an upper cavity mirror, a lower cavity mirror, an upper compensation ring and a lower compensation ring.

[0035] The cavity is vertically arranged, an upper cavity is arranged above the axis of the cavity, a lower cavity is arranged below the axis of the cavity, a left-right through upper air hole is arranged at the middle position of the upper cavity, a left-right through lower air hole is arranged at the middle position of the lower cavity, and the upper air hole and the lower air hole are perpendicular to the axis of the light hole.

[0036] The support ring is arranged around the axial center of the cavity and coaxial with the cavity, and is used for mounting the support structure of the cavity;

[0037] The upper cavity mirror is arranged on the upper end surface of the cavity, and the lower cavity mirror is arranged on the lower end surface of the cavity, and the upper cavity mirror and the lower cavity mirror are perpendicular to the clear aperture;

[0038] The upper compensation ring and the lower compensation ring are parallel to the upper cavity mirror and the lower cavity mirror respectively, and are perpendicular to the clear aperture, and are used for controlling the target zero expansion point temperature of the super-stable cavity.

[0039] Optionally, the support ring is uniformly provided with connecting through holes at intervals of 60°, and the connecting through holes are used for mounting the support structure to support the cavity.

[0040] Overall, compared with the prior art, the above technical scheme conceived by the present application can achieve the following beneficial effects:

[0041] 1. The technical scheme of the present application can construct a super-stable cavity with a target vibration sensitivity size through finite element simulation, construct a temperature-insensitive zero expansion point adjustable super-stable cavity model for different target zero expansion temperature points, and design a fixed clamping support structure for the designed super-stable cavity model, which is convenient to operate and has high practicability.

[0042] 2. The technical scheme of the present application avoids repeated iteration of cavity parameters in the design of a thermally and mechanically insensitive super-stable cavity through a specific thermal and mechanical finite element simulation process, and can quickly design the geometric parameters of the super-stable cavity according to the expected target.

[0043] 3. The super-stable cavity constructed by the technical scheme of the present application has six through holes uniformly distributed on the support ring, and the length of the support column is limited by the vacuum chamber for mounting the cavity, the diameter of the support column is variable, and the diameter size of the support column is scanned by using mechanical finite element simulation, so that the overall vibration sensitivity of the super-stable cavity with the support column is the lowest. Since the structure of the super-stable cavity itself is not changed, the zero expansion temperature point is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A flowchart of a vibration and temperature insensitive super-stable cavity construction method provided for an embodiment of the present application;

[0045] Figure 2 A structural schematic diagram of a vibration and temperature insensitive super-stable cavity provided for an embodiment of the present application;

[0046] Figure 3 A schematic diagram of a fixed clamping support structure of a vibration and temperature insensitive super-stable cavity provided for an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] Embodiment one

[0049] The content involved in the above embodiments will be described below in combination with a preferred embodiment.

[0050] Figure 1 A flowchart of a vibration and temperature insensitive super-stable cavity construction method provided in the embodiments of the present application.

[0051] As shown in Figure 1 A vibration and temperature insensitive super-stable cavity construction method comprises the following steps:

[0052] S1, establishing an initial super-stable cavity model based on preliminary model parameters.

[0053] S2, performing mechanical finite element simulation on the initial super-stable cavity model to establish a low-vibration-sensitivity super-stable cavity model.

[0054] S3, performing thermal finite element simulation on the low-vibration-sensitivity super-stable cavity model, determining the required compensation ring parameters according to different target zero-expansion temperature points, and constructing a zero-expansion-point-adjustable super-stable cavity model.

[0055] S4, after the obtained zero-expansion-point-adjustable super-stable cavity model is sequentially verified and adjusted through mechanical finite element simulation and thermal finite element simulation, constructing a fixed clamping support structure of the super-stable cavity model.

[0056] S5, after the constructed support structure is verified and adjusted through mechanical finite element simulation, generating a target super-stable cavity.

[0057] In view of the practical defects of the existing laboratory super-stable cavity, for example, the laboratory super-stable cavity is installed by relying on its own gravity in a non-fastening manner, has fewer applicable scenarios, and needs to use a completely fixed support structure for portable super-stable cavities, and the existing super-stable cavities usually do not have a fixed support structure, the volume and power consumption of the temperature control system are greatly limited in portable environments and space application environments. The embodiments of the present application provide a vibration and temperature insensitive super-stable cavity construction method, which obtains a super-stable cavity with low vibration sensitivity and adjustable zero expansion point based on mechanical and thermal finite element simulation.

[0058] Through the early thermal finite element simulation calculation of a plurality of shape models, a cavity with the largest adjustable range of zero expansion point is selected as an initial super stable cavity model; after the initial setting of the parameters of the super stable cavity, the vibration sensitivity of about 10 -10 / g level is obtained through the mechanical finite element simulation, and the size of the compensation ring required for different target zero expansion temperature points is calculated in the simulation model, and the shape design of the super stable cavity without a supporting structure is obtained through the iterative calculation of the thermal finite element simulation and the mechanical finite element simulation, and the fixed clamping supporting structure design is obtained through the mechanical finite element simulation calculation according to the shape design of the super stable cavity.

[0059] Optionally, step S1 specifically comprises:

[0060] S11, the preliminary model parameters are obtained according to the investigation data, the preliminary thermal simulation and the cavity length calculation.

[0061] S12, any one of a square cavity, a spherical cavity, a conical cavity and a double tetrahedron cavity is selected as the cavity shape in the initial model, and the initial super stable cavity model is established in combination with the preliminary model parameters.

[0062] The preliminary model parameters are established through the preliminary investigation and the cavity length calculation; then a plurality of shape models are calculated through the early thermal finite element simulation, such as a square cavity, a spherical cavity, a conical cavity, a double tetrahedron cavity and the like, and the adjustable range of the zero expansion point of the conical cavity is larger than that of other shape cavities, and the conical cavity is selected as the initial model, and the initial super stable cavity model is constructed according to the parameters of the preliminary model.

[0063] In the actual use of the super stable cavity, vibration will affect the equivalent cavity length of the super stable cavity and further cause the jitter of the super stable laser frequency, and the vibration noise can be suppressed by reducing the environmental vibration or reducing the vibration sensitivity of the super stable cavity. Since the environment of the portable super stable cavity is relatively harsh, the vibration sensitivity of the super stable cavity needs to be reduced by calculating the cavity supporting structure, the cavity parameters and the cavity supporting position through the mechanical finite element simulation.

[0064] Optionally, step S2 specifically comprises:

[0065] S21, the corresponding material properties are given to the materials of each part of the initial super stable cavity model.

[0066] Firstly, the file of the initial super stable cavity model is imported, and the material properties of the model are given, specifically including the material parameters such as the density, Poisson's ratio and Young's modulus of each component of the initial super stable cavity model.

[0067] S22, a mechanical physical field is constructed, a grid conforming to the initial super stable cavity model is selected, and a model grid is constructed.

[0068] Mechanical physics field is constructed, and the thickness of the grid is reasonably selected according to the actual required accuracy and the computing capacity, and the coarse, refined, particularly refined or extremely refined grid is selected, so as to construct a suitable model grid.

[0069] S23, parameterize scanning all parameters in the initial super stable cavity model, simulate the parameters according to the order of influence on vibration sensitivity, and obtain the minimum solution of the displacement corresponding to each parameter.

[0070] As shown in the formula (1), the initial super stable cavity model includes 12 components (101 to 112), and all parameters include the thickness, radius, distance from the cavity center and other parameters of the 12 components. Figure 2 All parameters in the model are parameterized and scanned, the influence of each parameter on the vibration sensitivity is summarized, the parameter with the greatest influence on the vibration sensitivity in the above process is obtained, and the parameter is taken as the main simulation point.

[0071] S24, obtain the parameter size of the super stable cavity model with low vibration sensitivity, and construct the super stable cavity model with low vibration sensitivity.

[0072] After obtaining the parameter size with the minimum displacement, the parameter size of the super stable cavity with low vibration sensitivity is obtained, and the super stable cavity with vibration sensitivity of about 10 -10 / g level is obtained through mechanical finite element simulation.

[0073] Environmental temperature fluctuation can cause cavity length jitter of the super stable cavity through thermal expansion, thereby affecting the frequency stability of the super stable laser. The cavity length jitter caused by temperature fluctuation can be suppressed by improving the environmental temperature stability or precisely controlling the temperature to the zero expansion temperature point of the super stable cavity. In the prior art, the zero expansion temperature point is roughly adjusted by a compensation ring, and the super stable cavity is precisely controlled at the zero expansion temperature point by a multi-layer temperature control system. If the zero expansion temperature point of the super stable cavity is consistent with or close to the environmental temperature, the power consumption of the temperature control system will be greatly reduced. To this end, the present application proposes to construct a super stable cavity with adjustable zero expansion point through thermal finite element simulation, thereby reducing the temperature control system, thereby reducing the volume, weight and power consumption of the device.

[0074] Optionally, step S3 specifically comprises:

[0075] S31, the material of each part of the super stable cavity model with low vibration sensitivity is endowed with corresponding material properties.

[0076]

[0077] ​The materials of each part of the low-vibration-sensitivity super-stable cavity are endowed with corresponding material properties, and in thermal simulation, each component of the low-vibration-sensitivity super-stable cavity model is not only endowed with basic parameters such as Young's modulus, Poisson's ratio and density, but also with the thermal expansion coefficient of the material. The material property parameters are obtained from international publications.

[0078] S32, constructing a thermal physical field, selecting a grid of the low-vibration-sensitivity super-stable cavity model, and constructing a model grid.

[0079] The thermal physical field is established, the solid mechanics module is selected, the thermal expansion unit is selected separately for parts with different material properties, and the coarse, fine, special fine or extreme fine grid is selected according to the actual required precision and running condition to construct the model grid.

[0080] S33, parameterizing scanning the thickness and inner diameter of the compensation ring in the low-vibration-sensitivity super-stable cavity model, and calculating the target zero-expansion point temperature according to the target environment temperature.

[0081] S34, obtaining the compensation ring size corresponding to the target zero-expansion point temperature, and constructing a zero-expansion point adjustable super-stable cavity model according to the obtained compensation ring size.

[0082] As shown in Figure 2 , the compensation ring is arranged at both ends of the cavity; the thickness and inner diameter of the compensation ring in the super-stable cavity model are parameterized scanned; the target environment temperature is determined according to the environment temperature of the super-stable cavity, and the target zero-expansion point temperature is calculated; then the compensation ring size corresponding to different zero-expansion points is calculated according to the target zero-expansion point temperature; the compensation ring size corresponding to different zero-expansion points is summarized; and the zero-expansion point adjustable super-stable cavity can be obtained by replacing the compensation ring with different sizes.

[0083] Optionally, step S4 specifically includes:

[0084] S41, the obtained zero-expansion point adjustable super-stable cavity model is subjected to repeated iteration calculation of mechanical finite element simulation and thermal finite element simulation in turn, the parameters are adjusted to be within a preset range, and a corrected zero-expansion point adjustable super-stable cavity model is generated.

[0085] After the mechanical finite element simulation and the thermal finite element simulation, the zero-expansion-point adjustable super-stable cavity model is obtained, and since the model parameters need to be adjusted during the thermal finite element simulation, in order to ensure that the obtained zero-expansion-point adjustable super-stable cavity model also meets the requirement of low vibration sensitivity, the model is subjected to mechanical finite element simulation calculation again; if the parameters are all within the preset range, that is, the vibration sensitivity meets the design requirement, the obtained zero-expansion-point adjustable super-stable cavity model does not need to be corrected; if the parameters exceed the preset range, that is, the vibration sensitivity does not meet the design requirement, the mechanical finite element simulation and the thermal finite element simulation are performed again, the related parameters are adjusted, and iterative calculation is repeatedly performed until the vibration sensitivity meets the requirement and the zero-expansion-temperature-point adjustable super-stable cavity is obtained.

[0086] In S42, six support columns are set, the corrected super-stable cavity model is subjected to mechanical finite element simulation, and the parameters of the support columns are calculated.

[0087] In S43, a super-stable cavity fixed clamping support structure is constructed according to the parameters of the support columns.

[0088] According to the structure schematic diagram of the super-stable cavity of Figure 2 and Figure 3 , six support columns 401 are uniformly spaced at an interval of 60°, six through holes are uniformly distributed on the super-stable cavity support ring, the length of the support column is assigned a fixed value due to the limitation of the vacuum chamber of the installation cavity, the diameter of the support column is variable, the support column 401 passes through the connection through hole 112 of the super-stable cavity support ring, and the size of the support column is calculated according to the super-stable cavity mechanical finite element simulation, so that the overall vibration sensitivity of the super-stable cavity with the support column is the lowest, and the zero-expansion-temperature-point is not affected since the structure of the super-stable cavity itself is not changed.

[0089] The super-stable cavity construction method provided in the embodiments of the present application can quickly and efficiently design a super-stable cavity with low vibration sensitivity and adjustable zero-expansion-point, and the constructed super-stable cavity has the advantages of being insensitive to vibration and temperature; and the fixed clamping support design can be widely used in non-laboratory environments, for example, a mobile super-stable cavity can be made, and for different use scenarios, the corresponding zero-expansion-point adjustable super-stable cavity can be constructed according to the required temperature.

[0090] Embodiment two

[0091] Figure 2 A structure schematic diagram of a vibration and temperature insensitive super-stable cavity provided in the second embodiment of the present application.

[0092] Based on the super-stable cavity construction method provided in the above embodiments, a vibration and temperature insensitive super-stable cavity 100 based on finite element simulation is constructed, which comprises a cavity 101, a support ring 102, an upper cavity mirror 105, a lower cavity mirror 106, an upper compensation ring 107, and a lower compensation ring 108.

[0093] The cavity 101 is vertically arranged, a light passing hole 109 is arranged inside the cavity 101 and vertically penetrates the cavity 101, an upper cavity 103 is arranged above the axis of the cavity 101, a lower cavity 104 is arranged below the axis of the cavity 101, an upper air hole 110 is arranged in the middle of the upper cavity 103 and vertically penetrates the upper cavity 103, a lower air hole 111 is arranged in the middle of the lower cavity 104 and vertically penetrates the lower cavity 104, and the upper air hole 110 and the lower air hole 111 are perpendicular to the axis of the light passing hole 109.

[0094] The support ring 102 is arranged around the axial center of the cavity 101 and is coaxial with the cavity 101, and the support ring 102 is used for fixedly mounting a support structure of the cavity; wherein, referring to Figure 3 , the support ring 102 is uniformly provided with a connecting through hole 112 at intervals of 60°, and the connecting through hole 112 is used for mounting a support structure to support the cavity 101.

[0095] The upper cavity mirror 105 is arranged on the upper end surface of the cavity 101, the lower cavity mirror 106 is arranged on the lower end surface of the cavity 101, and the upper cavity mirror 105 and the lower cavity mirror 106 are perpendicular to the light passing hole 109. Specifically, the upper cavity mirror 105 is arranged parallel to the upper end surface of the upper cavity 103, and the lower cavity mirror 106 is arranged parallel to the upper end surface of the lower cavity 104.

[0096] The upper compensation ring 107 and the lower compensation ring 108 are parallel to the upper cavity mirror 105 and the lower cavity mirror 106 respectively, and are perpendicular to the light passing hole 109, and are used for controlling the target zero expansion point temperature of the super-stable cavity.

[0097] The super-stable cavity model with target vibration sensitivity is constructed by mechanical finite element calculation, the compensation ring parameters in the model are calculated by thermal finite element simulation, the sizes of the compensation rings required for different target zero expansion temperature points are obtained, the super-stable cavity with adjustable zero expansion point is obtained by replacing the compensation rings, and the fixed clamping support structure design is obtained by mechanical finite element simulation according to the shape design of the super-stable cavity. The super-stable cavity with target vibration sensitivity and target zero expansion temperature point can be constructed, the fixed clamping support structure of the super-stable cavity model makes it portable and movable, which is suitable for various application scenarios, has the advantages of convenient operation, less required temperature control equipment and high feasibility.

[0098] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for constructing an ultrastable cavity that is insensitive to vibration and temperature, characterized in that, include: An initial ultrastable cavity model is established based on preliminary model parameters; Assign corresponding material properties to the materials of each part of the initial ultrastable cavity model; Construct the mechanical physical field, select a mesh that conforms to the initial ultrastable cavity model, and construct the model mesh; All parameters in the initial ultrastable cavity model are parametrically scanned. The parameters are simulated according to their influence on vibration sensitivity, and the minimum displacement solution corresponding to each parameter is obtained. Obtain the parameter dimensions of the ultrastable cavity model with low vibration sensitivity, and construct the ultrastable cavity model with low vibration sensitivity. The materials of each part of the ultra-stable cavity model with low vibration sensitivity are assigned corresponding material properties; Construct the thermal physical field, select a mesh that conforms to the ultrastable cavity model with low vibration sensitivity, and construct the model mesh; The thickness and inner diameter of the compensation ring in the low vibration sensitivity ultrastable cavity model are parametrically scanned, and the target zero expansion point temperature is calculated based on the target ambient temperature; the size of the compensation ring corresponding to the zero expansion point temperature is obtained, and the corresponding zero expansion point adjustable ultrastable cavity model is constructed based on the obtained compensation ring size. After the obtained ultra-stable cavity model with adjustable zero expansion point is verified and adjusted by mechanical finite element simulation and thermal finite element simulation, a fixed clamping support structure for the ultra-stable cavity model is constructed. After the constructed support structure is verified and adjusted through mechanical finite element simulation, the target ultra-stable cavity is generated.

2. The method for constructing an ultrastable cavity as described in claim 1, characterized in that, The materials of each part of the initial ultrastable cavity model are assigned corresponding material properties, including: The density, Poisson's ratio, and Young's modulus of each component of the initial ultrastable cavity model are assigned values.

3. The method for constructing an ultrastable cavity as described in claim 1, characterized in that, All parameters in the initial ultrastable cavity model include the thickness, radius, and distance from the cavity center of each component of the initial ultrastable cavity model.

4. The method for constructing an ultrastable cavity as described in claim 1, characterized in that, The process of assigning corresponding material properties to the materials of each part of the ultra-stable cavity model with low vibration sensitivity includes: The thermal expansion coefficient, density, Poisson's ratio, and Young's modulus of each component of the ultra-stable cavity model with low vibration sensitivity are assigned values.

5. The method for constructing an ultrastable cavity as described in claim 1, characterized in that, After the obtained ultra-stable cavity model with adjustable zero expansion point is verified and adjusted by mechanical finite element simulation and thermal finite element simulation, a fixed clamping support structure for the ultra-stable cavity model is constructed. The obtained ultra-stable cavity model with adjustable zero expansion point is subjected to repeated iterative calculations of mechanical finite element simulation and thermal finite element simulation. The parameters are adjusted to be within the preset range, and a corrected ultra-stable cavity model with adjustable zero expansion point is generated. With six support columns, a mechanical finite element simulation was performed on the corrected ultra-stable cavity model to calculate the parameters of the support columns. An ultra-stable cavity fixed clamping support structure is constructed based on the parameters of the support column.

6. The method for constructing an ultrastable cavity as described in claim 1, characterized in that, The establishment of the initial ultrastable cavity model based on preliminary model parameters includes: Preliminary model parameters were obtained based on survey data, preliminary thermal simulation, and cavity length calculation. Choose any one of the following cavity shapes—square cavity, spherical cavity, conical cavity, and double tetrahedral cavity—as the cavity shape in the initial model, and establish an initial ultrastable cavity model based on the preliminary model parameters.

7. A vibration- and temperature-insensitive ultrastable cavity, obtained according to the ultrastable cavity construction method as described in any one of claims 1-6, characterized in that, include: Cavity, support ring, upper endoscope, lower endoscope, upper compensation ring, and lower compensation ring; The cavity is vertically arranged, and a light-transmitting hole is provided inside the cavity. The cavity portion above the axis of the cavity is the upper cavity, and the cavity portion below the axis is the lower cavity. A left-right through upper vent is provided in the middle of the upper cavity, and a left-right through lower vent is provided in the middle of the lower cavity. The upper vent and the lower vent are perpendicular to the axis of the light-transmitting hole. The support ring is arranged around the axial center of the cavity and is coaxial with the cavity. The support ring is used to fix the support structure of the cavity. The upper cavity mirror is disposed on the upper end face of the cavity, and the lower cavity mirror is disposed on the lower end face of the cavity. Both the upper cavity mirror and the lower cavity mirror are perpendicular to the light-transmitting hole. The upper compensation ring and the lower compensation ring are parallel to the upper cavity mirror and the lower cavity mirror, respectively, and perpendicular to the light-transmitting aperture, and are used to control the target zero expansion point temperature of the ultra-stable cavity.

8. The ultra-stable cavity according to claim 7, characterized in that, The support ring is provided with connecting through holes at 60° intervals. The connecting through holes are used to install the support structure to support the cavity.

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