CN221783615U - A transportable ultra-stable high-finesse optical Fabry-Perot reference cavity - Google Patents
A transportable ultra-stable high-finesse optical Fabry-Perot reference cavity Download PDFInfo
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- CN221783615U CN221783615U CN202321088586.2U CN202321088586U CN221783615U CN 221783615 U CN221783615 U CN 221783615U CN 202321088586 U CN202321088586 U CN 202321088586U CN 221783615 U CN221783615 U CN 221783615U
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Abstract
The utility model relates to a transportable ultra-stable high-definition optical Fabry-Perot reference cavity, which is applicable to an ultra-stable laser and is characterized in that: the portable ultra-stable high-definition optical Fabry-Perot reference cavity comprises a cubic cavity structure, a supporting structure, a heat shielding structure and a vacuum chamber structure; the cube cavity structure forms a stable frequency reference in a laser system; the support structure is used for fixing the cube cavity structure and stably connecting the transportable ultra-stable high-definition optical Fabry-Perot reference cavity with other laser systems, and the cube reference cavity is connected with the support structure in an eight-point support mode. In the carrying process, laser always enters the reference cavity at a fixed angle; the heat shielding structure is used for isolating the system from external heat exchange, guaranteeing the stability of the temperature in the cavity, and the vacuum chamber structure is used for realizing the maintenance of the vacuum degree in the cavity.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a portable ultra-stable high-definition optical Fabry-Perot reference cavity.
Background
The ultra-stable laser has excellent spectral purity, excellent space-time coherence and high stability of medium-short term frequency characteristics, and has important application value in the fields of high-precision optical clock development, gravitational wave detection, basic physical constant test, earth gravitational field inversion, low-noise microwave signal generation, optical frequency transmission and the like. Therefore, ultrastable lasers have been a hotspot for scientific research for many years.
Because the laboratory environment is relatively stable, the ultrastable laser can achieve better performance. However, with the development of scientific technology and further development of scientific research, the requirement that an ultra-stable laser leave a laboratory is gradually revealed. At present, the research on the transportable application of the ultra-stable laser also has a certain research foundation, and the vibration sensitivity of the reference cavity is reduced by adopting the shape optimization and symmetrical support modes of a spherical reference cavity, a cylindrical reference cavity and the like, but the known schemes cannot meet the environmental requirements of the ultra-stable laser for space application. In order to overcome the noise limit of light Zhong Yinli and further improve the time frequency measurement precision, the optical clock is sent to space to become the future necessary development trend. For portable optical clocks or optical clocks for space applications, the volume of the optical system is as small as possible, so the volume of the optical reference cavity needs to be as small as possible to facilitate the portability.
The currently mainstream ultra-stable laser adopts an optical reference cavity as a frequency reference, so that the stability of the frequency reference is reduced due to the impact caused by the moving process in the portable and space application environment and the environmental vibration in the non-laboratory environment, and the high-definition optical Fabry-Perot cavity can provide high-precision frequency standard and fine frequency resolution and has important application in the fields of super-resolution spectrum, quantum precision measurement, optical atomic clocks, quantum information and the like. The optical reference cavity is used as a core device of the ultra-stable laser, and in order to meet the carrying requirement of the ultra-stable laser, a high-definition Fabry-Perot reference cavity scheme which can be suitable for a vehicle-mounted carrying environment and a space load application environment is urgently needed.
The frequency stability of optical cavities such as high-definition Fabry-Perot reference cavities mainly depends on the mechanical stability of the optical cavities and cavity length changes caused by environmental temperature changes, and the cavity length stability is mainly determined by the performances such as the temperature sensitivity, the Brownian thermal noise and the vibration sensitivity of the cavities. At present, the requirements of a portable ultra-stable laser system can be met, and the mechanical structure of a cavity needs to be optimized and the environment noise is effectively isolated by an optical cavity.
How to realize a portable ultra-stable laser system becomes a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
In order to solve the above problems, an object of the present utility model is to provide a portable ultra-stable high-definition optical fabry-perot reference cavity.
For this purpose, the above object of the present utility model is achieved by the following technical solutions:
The utility model provides a superstable high definition optical Fabry-Perot reference chamber of can carrying, is applicable to superstable laser, its characterized in that: the portable ultra-stable high-definition optical Fabry-Perot reference cavity comprises a cubic cavity structure, a supporting structure, a heat shielding structure and a vacuum chamber structure; the cube cavity structure forms a stable frequency reference in a laser system; the supporting structure is used for fixing the cube cavity structure and stably connecting the transportable ultra-stable high-definition optical Fabry-Perot reference cavity with other laser systems, the cube reference cavity and the supporting structure are connected by adopting an eight-point supporting mode, and laser always enters the reference cavity at a fixed angle in the transporting process; the heat shielding structure is used for isolating the system from external heat exchange, guaranteeing the stability of the temperature in the cavity, and the vacuum chamber structure is used for realizing the maintenance of the vacuum degree in the cavity.
The utility model can also adopt or combine the following technical proposal when adopting the technical proposal:
As a preferable technical scheme of the utility model: the cubic cavity is made of a glass material with an ultra-low thermal expansion coefficient.
As a preferable technical scheme of the utility model: eight vertex angles of the cubic cavity are cut to form eight equally large triangular support planes.
As a preferable technical scheme of the utility model: three light-passing holes penetrating through the cubic cavity are formed in the cubic cavity structure, the central axes of the light-passing holes pass through the geometric center of the cubic cavity, the light-passing holes are perpendicular to each other, and ULE rings are arranged at two ends of the light-passing holes.
As a preferable technical scheme of the utility model: the supporting structure adopts a cube metal edge frame, four sides are additionally provided with diagonal supporting structures, and eight outer vertex angles are cut to form a nut fixing plane.
As a preferable technical scheme of the utility model: the cube supporting structure is connected with the cube cavity structure through pre-tightening screws.
As a preferable technical scheme of the utility model: a cylindrical heat insulation cushion block made of polyether-ether-ketone (PEEK) materials is arranged between the cube cavity structure and the pre-tightening screw.
As a preferable technical scheme of the utility model: and epoxy glue or vacuum glue is adopted for auxiliary reinforcement between the cube cavity structure and the cylindrical heat insulation cushion block made of polyether-ether-ketone (PEEK) material.
As a preferable technical scheme of the utility model: three layers of gold-plated shielding layer sleeves are nested outside the supporting structure;
Or, the outer part of the gold-plated shielding sleeve is sleeved with a cylindrical vacuum chamber.
As a preferable technical scheme of the utility model: the gold-plated shielding layer sleeve is in a cylindrical shape with three different diameters, and the bottom plate is in a circular shape with three corresponding diameters. The layers are separated from the layer bottom plate by a plurality of polyether ether ketone (PEEK) heat insulation cushion blocks.
Compared with the prior art, the high-definition optical Fabry-Perot reference cavity of the portable ultra-stable laser has the following beneficial effects:
(1) The reference cavity is compact in whole, small in size and easy to move.
(2) The reference cavity system is not easily influenced by external disturbance factors such as gravity, vibration, impact and the like, and higher stability is provided in vehicle-mounted portable and space application scenes.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a high-definition optical Fabry-Perot reference cavity of a portable ultrastable laser according to the present utility model;
FIG. 2 is a schematic top view of a cube support structure according to the present utility model;
fig. 3 is a graph of laser mode and detector signal before and after reference cavity mechanical test:
FIG. 3.1 is a TEM 00 mode spot of the reference cavity prior to mechanical vibration testing;
FIG. 3.2 is a TEM 01 mode spot of the reference cavity prior to mechanical vibration testing;
FIG. 3.3 is reference cavity transmission peak intensity data prior to mechanical vibration testing;
FIG. 3.4 shows a TEM 00 mode spot of the reference cavity after mechanical vibration testing;
FIG. 3.5 shows a TEM 01 mode spot of the reference cavity after mechanical vibration testing;
FIG. 3.6 is transmission peak intensity data of the reference cavity after mechanical vibration test;
In the figures, the cube ULE references cavity 1.1; a reference cavity support frame 1.2; 1.3 of three gold-plating shielding layers; a vacuum chamber 1.4; a support frame 2.1; pre-tightening a screw 2.2; and 2.3 of a heat insulation cushion block.
Detailed Description
As shown in FIG. 1, the high-definition optical Fabry-Perot reference cavity of the portable ultrastable laser disclosed by the utility model has an overall structure comprising a cube ULE reference cavity 1.1, a reference cavity supporting frame 1.2, three layers of gold-plated shielding layers 1.3 and a vacuum chamber 1.4.
As shown in fig. 2, a high-definition optical fabry-perot reference cavity of a portable ultra-stable laser, the support structure of which comprises a support frame 2.1, a pre-tightening screw 2.2 and a heat insulation cushion block 2.3 made of polyether-ether-ketone (PEEK) material.
The utility model provides a supporting structure installation mode, which comprises the following steps:
The first step: and establishing a three-dimensional coordinate system by taking the central axis of a longitudinal light passing hole of the cubic ULE reference cavity 1.1 made of ULE glass as the vertical direction, modeling and calculating by using finite element numerical simulation software, confirming the symmetrical placement positions of the eight heat insulation cushion blocks 2.3 for supporting, and calculating the corresponding pretightening force.
And a second step of: and placing the cube ULE reference cavity 1.1 at a corresponding initial supporting position according to the calculation result, measuring the installation angle by using a level meter, and performing adjustment and correction.
And a third step of: and after confirming the installation position, using epoxy glue or vacuum glue to seal the connection part.
Fourth step: and installing a shielding layer sleeve and a vacuum chamber 1.4 structure.
Fifth step: and (3) mechanical test verifies the stability of the current supporting position, if the current supporting position meets the requirement, the installation is finished, if the current supporting position is not the optimal position, the supporting position is estimated and adjusted according to the deviation result of the experimental test, and the test is repeated until the requirement is met.
Specifically, to determine whether the reference cavity can pass the mechanical test, the following examples are specifically implemented:
referring to fig. 1, the system structure and the supporting mode of fig. 2 perform vibration mechanics test on a pre-cavity optical path, a post-cavity optical path and a cavity together, the pre-cavity optical path provides a laser light source for incidence to the reference cavity, and the post-cavity optical path is provided with a CCD camera and a detector for detecting transmission signals of the reference cavity. And judging the deviation condition of the reference cavity according to the mode images and voltage signals of the camera and the detector behind the cavity. Fig. 3 shows the laser mode and the detector signal before and after the mechanical test of the reference cavity, and it can be seen that the TEM 00 mode is not significantly reduced before and after the mechanical test, and the other modes are not significantly enhanced, and the intensity of the PD voltage signal after the cavity is not significantly changed before and after the mechanical test, which proves that the reference cavity is not significantly deviated before and after the mechanical test.
From the test results, the high-definition optical Fabry-Perot reference cavity scheme of the portable ultra-stable laser is effective.
The above detailed description is intended to illustrate the present utility model by way of example only and not to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The utility model provides a superstable high definition optical Fabry-Perot reference chamber of can carrying, is applicable to superstable laser, its characterized in that: the portable ultra-stable high-definition optical Fabry-Perot reference cavity comprises a cubic cavity structure, a supporting structure, a heat shielding structure and a vacuum chamber structure; the cube cavity structure forms a stable frequency reference in a laser system; the supporting structure is used for fixing the cube cavity structure and stably connecting the transportable ultra-stable high-definition optical Fabry-Perot reference cavity with other laser systems, the cube cavity structure and the supporting structure are connected by adopting an eight-point supporting mode, and laser always enters the reference cavity at a fixed angle in the transporting process; the heat shielding structure is used for isolating the system from external heat exchange, guaranteeing the stability of the temperature in the cavity, and the vacuum chamber structure is used for realizing the maintenance of the vacuum degree in the cavity.
2. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: the cubic cavity structure is made of a glass material with an ultra-low thermal expansion coefficient.
3. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: eight vertex angles of the cube cavity structure are cut to form eight equally large triangular support planes.
4. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: three light-passing holes penetrating through the cubic cavity are formed in the cubic cavity structure, the central axes of the light-passing holes pass through the geometric center of the cubic cavity, the light-passing holes are perpendicular to each other, and ULE rings are arranged at two ends of the light-passing holes.
5. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: the supporting structure adopts a cube metal edge frame, four sides are additionally provided with diagonal supporting structures, and eight outer vertex angles are cut to form a nut fixing plane.
6. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: the supporting structure is connected with the cube cavity structure through pre-tightening screws.
7. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1 or 6, wherein: a cylindrical heat insulation cushion block made of polyether-ether-ketone PEEK material is arranged between the cube cavity structure and the pre-tightening screw.
8. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1 or 6, wherein: and epoxy glue or vacuum glue is adopted for auxiliary reinforcement between the cube cavity structure and the cylindrical heat insulation cushion block made of polyether-ether-ketone PEEK material.
9. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1, wherein: three layers of gold-plated shielding layer sleeves are nested outside the supporting structure;
Or, the outer part of the gold-plated shielding sleeve is sleeved with a cylindrical vacuum chamber.
10. The portable ultra-stable high definition optical fabry-perot reference cavity of claim 1 or 9, wherein: the gilding shielding layer sleeve is cylindrical with three different diameters, the bottom plate is round with three corresponding diameters, and the layers are separated by using a plurality of polyether-ether-ketone heat insulation cushion blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321088586.2U CN221783615U (en) | 2023-05-09 | 2023-05-09 | A transportable ultra-stable high-finesse optical Fabry-Perot reference cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321088586.2U CN221783615U (en) | 2023-05-09 | 2023-05-09 | A transportable ultra-stable high-finesse optical Fabry-Perot reference cavity |
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| Publication Number | Publication Date |
|---|---|
| CN221783615U true CN221783615U (en) | 2024-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321088586.2U Active CN221783615U (en) | 2023-05-09 | 2023-05-09 | A transportable ultra-stable high-finesse optical Fabry-Perot reference cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221783615U (en) |
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2023
- 2023-05-09 CN CN202321088586.2U patent/CN221783615U/en active Active
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