A transportable optical reference cavity system with anti-vibration structure

Abstract

The present invention discloses a portable optical reference cavity system with an anti-vibration structure. The reference cavity unit is arranged in a shielding layer. The reference cavity unit includes a cavity support. A cavity through-column hole is vertically provided in the cavity support. A first cavity mirror and a second cavity mirror are respectively provided at both ends of the cavity through-column hole. A vacuum channel is provided on the side of the cavity support. A ridge ring is provided in the middle of the cavity support. The bottom and top of the coupling bracket are respectively connected to the outer ring side wall of the ridge ring and the optical coupling component. The top and bottom of the cavity fixing bracket are respectively connected to the outer ring side wall of the ridge ring and the shielding layer lower cover plate of the shielding layer. The shielding layer includes an upper cover plate of the shielding layer, a lower cover plate of the shielding layer, a shielding cover, and a plate-type elastic bracket. The cavity fixing bracket and the coupling bracket of the present invention both have the function of buffering and shock absorption, and can reduce the influence of external environmental vibration on the reference cavity unit; at the same time, a shielding layer with buffering and shock absorption is also designed in the reference cavity unit to further reduce the influence of the external environment on the ultra-stable laser.

Description

Technical Field

[0001] The invention belongs to the field of ultra-stable optical reference cavities, and in particular relates to a transportable optical reference cavity system with an anti-vibration structure. Background Art

[0002] Because ultrastable lasers have extremely low frequency noise, narrow linewidth and ultra-high frequency stability, they play an important role in the fields of optical atomic clocks, gravitational wave detection, precision measurement, etc. In order to better meet the needs of different experimental environments, we urgently need to develop portable ultrastable lasers.

[0003] The key to portable ultra-stable lasers is the portability of the optical reference cavity. PDH laser frequency stabilization technology is currently the most commonly used and effective method to obtain ultra-stable lasers. In PDH laser frequency stabilization technology, the frequency stability of ultra-stable lasers mainly depends on the stability of the optical reference cavity length. The inevitable vibration in the environment will cause changes in the reference cavity length and the optical coupling position, which will affect the performance of the ultra-stable laser.

[0004] In order to solve the problem that the optical reference cavity is difficult to transport, the present invention provides a portable optical reference cavity with an anti-vibration structure. The present invention designs a compact structure, integrates the optical coupling structure with the optical reference cavity, is convenient to use and transport, and can avoid changes in the performance of the ultra-stable laser caused by the coupling position offset during transportation; at the same time, a shielding layer with a buffering and shock-absorbing structure is designed to avoid the influence of external environmental vibration on the ultra-stable laser. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned disadvantages of the prior art and to provide a transportable optical reference cavity system with an anti-vibration structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A transportable optical reference cavity system with an anti-vibration structure comprises a reference cavity unit, which is arranged in a shielding layer. The reference cavity unit comprises a cavity support, in which a cavity-through cylindrical hole is vertically provided, a first cavity mirror and a second cavity mirror are respectively provided at both ends of the cavity-through cylindrical hole, a vacuum channel connected to the cavity-through cylindrical hole is provided on the side of the cavity support, a ridge ring is provided in the middle of the cavity support, a side camber of a coupling bracket camber fixing platform at the bottom of the coupling bracket is fixed on the outer ring side wall of the ridge ring, a side camber of a coupling bracket camber fixing platform at the top of the coupling bracket is fixed on the side wall of a coupling panel of an optical coupling component, a cavity fixing bracket camber fixing platform at the top of the cavity fixing bracket is fixed on the outer ring side wall of the ridge ring, and a vertical fixing platform at the bottom of the cavity fixing bracket is fixed on the shielding layer lower cover plate of the shielding layer.

[0008] As described above, the shielding layer includes an upper cover plate of the shielding layer, a lower cover plate of the shielding layer, a shielding cover, and a plate-type elastic bracket. The plate-type elastic bracket includes a bracket side plate. A horizontal fixing seat is arranged on the top of the bracket side plate, a vertical supporting seat is arranged on the bottom of the bracket side plate, the middle part of the bracket side plate is connected to the top of the inner support plate, a horizontal supporting seat is arranged on the bottom of the inner support plate, an upper cut surface of the cover plate is arranged on the side wall of the upper cover plate of the shielding layer, a horizontal fixing seat is fixed on the cut surface of the upper cover plate, a groove is arranged on the side of the horizontal supporting seat, a buffer pad is placed in the groove on the horizontal supporting seat, the buffer pad protrudes from the groove notch and contacts with the cut surface of the lower cover plate of the shielding layer, and the vertical supporting seat is fixed on the external operating table.

[0009] As described above, the optical coupling assembly includes a coupling panel, a reflector, a cavity coupling seat, and an optical fiber collimator. The coupling panel is provided with a panel-through cylindrical hole, the cavity coupling seat is arranged on the coupling panel, and the cavity coupling seat is provided with a longitudinal through hole and a transverse hole. The longitudinal through hole longitudinally penetrates the cavity coupling seat, and a reflector is arranged at the top of the longitudinal through hole. One end of the transverse hole is connected to the longitudinal through hole and extends through the reflector, and the other end is fixed with an optical fiber collimator. The reflector is at a set angle with the horizontal plane, and the longitudinal through hole, the panel-through cylindrical hole and the cavity-through cylindrical hole are located on the same center line.

[0010] As mentioned above, the plate-type elastic support plates are multiple and are rotationally symmetrically distributed around the longitudinal central axis supported by the cavity.

[0011] As described above, the cavity fixing brackets are multiple and are rotationally symmetrically distributed around the longitudinal center axis of the cavity support, and the coupling brackets are multiple and are rotationally symmetrically distributed around the longitudinal center axis of the cavity support.

[0012] As described above, the number of cavity fixing brackets and coupling brackets is the same, and the cavity fixing brackets and coupling brackets are distributed at equal azimuth intervals.

[0013] As described above, the cavity fixing bracket includes a cavity supporting plate, and the inner sides of the top end and the bottom end of the cavity supporting plate are respectively provided with an arc surface fixing platform and a vertical fixing platform of the cavity fixing bracket, and the arc surface fixing platform of the cavity fixing bracket includes a fixed protrusion block, a conversion block and an arc-shaped fixing block, the fixed protrusion block is connected to the cavity supporting plate, the inner side surface of the fixed protrusion block is connected to the outer side surface of the arc-shaped fixing block through the conversion block, and the inner side surface of the arc-shaped fixing block is an arc surface adapted to the shape of the ridge ring.

[0014] As described above, the coupling bracket includes a coupling plate, and the inner sides of the top and bottom ends of the coupling plate are both provided with coupling bracket arc surface fixing platforms. The outer side surface of the coupling bracket arc surface fixing platform is flush with the coupling plate, and the inner side surface of the coupling bracket arc surface fixing platform is an arc surface adapted to the shape of the ridge ring.

[0015] As mentioned above, the cavity support includes two cones which are symmetrically arranged and connected with the cone bottom surfaces, and a ridge ring is arranged at the connection of the cone bottom surfaces.

[0016] As mentioned above, the material of the buffer pad is polyimide or polytetrafluoroethylene.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention integrates the optical coupling component with the reference cavity unit, which is convenient for use and transportation; the designed cavity fixing bracket and coupling bracket both have the function of buffering and shock absorption, which can reduce the influence of external environmental vibration on the reference cavity unit; at the same time, a buffering and shock-absorbing shielding layer is also designed in the reference cavity unit to further reduce the influence of the external environment on the ultra-stable laser. The triple protection minimizes the influence of external environmental vibration on the reference cavity unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a transportable optical reference cavity system with a vibration-resistant structure provided in an embodiment of the present invention.

[0020] Figure 2 For along Figure 1 Schematic diagram of the cross section of the middle S plane;

[0021] Figure 3 for Figure 1 A top view of

[0022] Figure 4 It is a schematic diagram of the planar structure of the plate-type elastic bracket in an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of the three-dimensional structure of a reference cavity unit in an embodiment of the present invention;

[0024] Figure 6 It is a front view of the cavity support in an embodiment of the present invention;

[0025] Figure 7 is a front view of an optical coupling component in an embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of the three-dimensional structure of a coupling panel in an embodiment of the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the cavity fixing bracket in an embodiment of the present invention;

[0028] Fig.10 is a schematic diagram of the three-dimensional structure of a coupling bracket in an embodiment of the present invention;

[0029] In the figure: 1-shielding layer; 2-optical reference cavity unit;

[0030] 1-shielding layer: 111-shielding layer upper cover; 112-shielding layer lower cover; 12-shielding cover; 13-plate elastic bracket; 131-buffer pad; 132-buffer pad fixing top screw; 133-horizontal fixing seat; 134-vertical fixing seat; 135-horizontal supporting seat; 136-bracket side plate; 137-inner support plate; 138 bracket outer plate; 139-dividing groove; 14-upper cover section; 15-lower cover section.

[0031] 2-reference cavity unit: 21-cavity support; 23-cavity fixing bracket; 24-coupling bracket; 25-optical coupling component; 26-ridge ring; 221-first cavity mirror; 222-second cavity mirror; 231-cavity fixing bracket arc surface fixing platform; 232-vertical fixing platform; 233-cavity support plate; 2311-fixed protrusion block; 2312-adapter block; 2313-arc-shaped fixing block; 241-coupling bracket arc surface fixing platform; 242-coupling plate; 251-coupling panel; 252-reflector (partial reflection and partial transmission); 253-cavity coupling seat; 254-fiber type collimator. DETAILED DESCRIPTION

[0032] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in combination with embodiments and with reference to the accompanying drawings. The implementation examples described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0033] refer to Figures 1 to 9 As shown, a transportable optical reference cavity system with a vibration-resistant structure comprises a shielding layer 1 and a reference cavity unit 2 , wherein the reference cavity unit 2 is arranged in the shielding layer 1 .

[0034] The reference cavity unit 2 comprises a cavity support 21, a first cavity mirror 221, a second cavity mirror 222, a cavity fixing bracket 23, a coupling bracket 24, an optical coupling component 25, and a ridge ring 26. The central axis direction of the cavity support 21 is the vertical direction, and the horizontal direction is perpendicular to the vertical direction. A cavity through-column hole is vertically opened in the cavity support 21, and the cavity through-column hole serves as an optical channel. The first cavity mirror 221 and the second cavity mirror 222 are respectively arranged at both ends of the cavity through-column hole. A vacuum channel connected to the cavity through-column hole is opened on the side of the cavity support 21, and the vacuum channel is used to vacuum the cavity through-column hole. A ridge ring 26 is arranged in the middle of the cavity support 21, and a coupling bracket 24 is arranged at the bottom of the coupling bracket 24. The side arc surface of the coupling bracket arc surface fixing platform 241 is fixed to the outer ring side wall of the ridge ring 26 by glue, the side arc surface of the coupling bracket arc surface fixing platform 241 at the top of the coupling bracket 24 is fixed to the side wall of the coupling panel 251 of the optical coupling component 25 by glue, the cavity fixing bracket arc surface fixing platform 231 at the top of the cavity fixing bracket 23 is fixed to the outer ring side wall of the ridge ring 26 by glue, and the vertical fixing platform 232 at the bottom of the cavity fixing bracket 23 is fixed to the shielding layer lower cover plate 112 of the shielding layer 1 by screws. The glue can be a high-strength two-component optical epoxy glue.

[0035] In some embodiments, the shielding layer 1 includes a shielding layer upper cover plate 111, a shielding layer lower cover plate 112, a shielding cover 12, a plate-type elastic bracket 13, a buffer pad 131, and a buffer pad fixing top screw 132. The shielding cover 12 is a thin-walled cylinder. The shielding layer upper cover plate 111 and the shielding layer lower cover plate 112 are respectively fixed to the top and bottom ends of the shielding cover 12 with screws. An upper cover plate section 14 is arranged on the side wall of the shielding layer upper cover plate 111, and a lower cover plate section 15 is arranged on the side wall of the shielding layer lower cover plate 112. The plate-type elastic bracket 13 includes a bracket side plate 136. A horizontal fixing seat 133 is arranged on the top of the bracket side plate 136, a vertical support seat 134 is arranged at the bottom of the bracket side plate 136, and a middle portion of the bracket side plate 136 is provided with a vertical support seat 134. Connected to the top of the inner support plate 137, a horizontal support seat 135 is arranged at the bottom of the inner support plate 137, a vertical support seat 134 is located below the horizontal support seat 135, a horizontal fixing seat 133 is fixed on the upper cover plate section 14 by screws, a groove is arranged on the side of the horizontal support seat 135, a buffer pad 131 is placed in the groove on the horizontal support seat 135, the thickness of the buffer pad 131 is higher than the groove notch, the buffer pad 131 protrudes from the groove notch, and the buffer pad 131 contacts the shielding layer lower cover plate section 15, and under the joint action of the inner support plate 137 and the buffer pad 131, it plays a supporting and buffering role, and the vertical support seat 134 on the plate-type elastic bracket 13 is fixed on the external operating table to which this embodiment is applied by screws. Through the above-mentioned structural setting, the influence of external environmental vibration on the reference cavity unit 2 can be buffered.

[0036] In some embodiments, a dividing groove 139 is opened at the lower portion of the bracket side plate 136, and the dividing groove 139 divides the lower portion of the bracket side plate 136 into a bracket outer plate 138 and an inner support plate 137. A vertical support seat 134 is set at the bottom of the bracket outer plate 138, and a horizontal support seat 135 is set at the bottom of the inner support plate 137.

[0037] In some embodiments, a threaded hole is provided on the groove wall of the side of the horizontal support seat 135, and the threaded end of the buffer pad fixing screw 132 is screwed into the threaded hole and abuts against the buffer pad 131 to fix the buffer pad 131 in the groove.

[0038] In some embodiments, there are multiple plate-type elastic supports 13 and they are rotationally symmetrically distributed around the longitudinal center axis of the cavity support 21 .

[0039] In some embodiments, the optical coupling assembly 25 includes a coupling panel 251, a reflector 252, a cavity coupling seat 253, and an optical fiber collimator 254. The coupling panel 251 is a flat cylinder, the radius of which is equal to the radius of the ridge ring 26, the coupling bracket 24 is symmetrical and interchangeable at both ends, and the coupling panel 251 is provided with a panel-through cylindrical hole, which serves as an optical channel, and the cavity coupling seat 253 is disposed on the coupling panel 251, and a longitudinal through hole and a transverse hole are provided on the cavity coupling seat 253, the longitudinal through hole longitudinally penetrates the cavity coupling seat 253, a reflector 252 is disposed at the top of the longitudinal through hole, one end of the transverse hole is connected to the longitudinal through hole and extends through the reflector 252, and the other end is fixed with an optical fiber collimator 254 by glue, the reflector 252 is at a set angle with the horizontal plane, and the longitudinal through hole, the panel-through cylindrical hole and the cavity-through cylindrical hole are located on the same center line.

[0040] In some embodiments, the cavity coupling seat 253 is an isosceles right-angled prism, and the two end faces of the isosceles right-angled prism are two right-angled side faces. The three side faces of the isosceles right-angled prism are respectively a first right-angled side square face, a second right-angled side square face, and a square bevel. The first right-angled side square face is located on the top surface of the coupling panel 251, the second right-angled side square face is perpendicular to the top surface of the coupling panel 251, the square bevel is 45 degrees to the top surface of the coupling panel 251, the transverse hole is arranged on the second right-angled side square face, the reflector 252 is arranged on the square bevel with glue, and the longitudinal through hole passes through the square bevel and the first right-angled side square face.

[0041] In some embodiments, there are multiple cavity fixing brackets 23 and are rotationally symmetrically distributed around the longitudinal center axis of the cavity support 21, and there are multiple coupling brackets 24 and are rotationally symmetrically distributed around the longitudinal center axis of the cavity support 21. As a preferred scheme, the number of cavity fixing brackets 23 and coupling brackets 24 is the same, and the cavity fixing brackets 23 and coupling brackets 24 are distributed at equal azimuthal intervals.

[0042] The cavity fixing bracket 23 includes a cavity supporting plate 233, which is a thin plate structure. The cavity fixing bracket arc surface fixing platform 231 and the vertical fixing platform 232 are respectively arranged on the inner side of the top end and the inner side of the bottom end of the cavity supporting plate 233. The cavity fixing bracket arc surface fixing platform 231 includes a fixed protrusion block 2311, a transfer block 2312 and an arc-shaped fixing block 2313. The fixed protrusion block 2311 is connected to the cavity supporting plate 233. Preferably, the fixed protrusion block 2311 is integrally connected to the cavity supporting plate 233, and the outer side surface of the fixed protrusion block 2311 is flush with the outer side surface of the cavity supporting plate 233. The inner side surface of the fixed protrusion block 2311 is connected to the outer side surface of the arc-shaped fixed block 2313 through the adapter block 2312. The inner side surface of the arc-shaped fixed block 2313 is an arc surface that matches the shape of the ridge ring 26. As a preferred solution, the radius of the arc surface is equal to the radius of the ridge ring 26. The outer side surface and the outer side surface of the vertical fixed platform 232 are not flush with the cavity support plate 233. The above-mentioned inner side surface refers to the side facing the cavity support 21, and the outer side surface refers to the side away from the cavity support 21.

[0043] The coupling bracket 24 includes a coupling plate 242, which is a thin plate structure. A coupling bracket arc surface fixing platform 241 is provided on the inner side of the top and the inner side of the bottom of the coupling plate 242. The outer side surface of the coupling bracket arc surface fixing platform 241 is flush with the coupling plate 242. The inner side surface of the coupling bracket arc surface fixing platform 241 is an arc surface that matches the shape of the ridge ring 26. As a preferred solution, the radius of the arc surface is equal to the radius of the ridge ring 26. Through the above-mentioned rotationally symmetrical installation method and structural setting, the deformation of the cavity support 21 and the relative displacement of the optical coupling component 25 and the cavity support 21 can be suppressed.

[0044] The coupling bracket arc surface fixing platform 241 and the arc-shaped fixing block 2313 are distributed at equal azimuth intervals on the outer ring side of the ridge ring 26.

[0045] In some embodiments, three or more plate-type elastic brackets 13 are arranged on the periphery of the shielding layer upper cover plate 111 , the shielding layer lower cover plate 112 , and the shielding cover 12 , and are rotationally symmetrically arranged around the shielding cover 12 .

[0046] In some embodiments, the cavity support 21 includes two symmetrically arranged cones whose cone bottom surfaces are connected, and a ridge ring 26 is provided at the connection of the cone bottom surfaces.

[0047] In some embodiments, the buffer pad 131 is made of a non-metallic material with poor thermal conductivity and high mechanical strength, such as polyimide or polytetrafluoroethylene.

[0048] The present invention is not limited to the above-mentioned implementation modes. The above-mentioned embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept of the present invention. The implementation schemes in the above-mentioned embodiments can be further combined or replaced. Various changes and improvements made to the technical solutions of the present invention by those skilled in the art all belong to the protection scope of the present invention.

Claims

1. A transportable optical reference cavity system with a vibration-resistant structure, comprising a reference cavity unit (2), characterized in that: The reference cavity unit (2) is arranged in the shielding layer (1), and the reference cavity unit (2) comprises a cavity support (21), a cavity through-column hole is vertically provided in the cavity support (21), a first cavity mirror (221) and a second cavity mirror (222) are respectively provided at both ends of the cavity through-column hole, a vacuum channel connected to the cavity through-column hole is provided on the side of the cavity support (21), a ridge ring (26) is provided in the middle of the cavity support (21), and a coupling support arc surface fixing platform (241) at the bottom of the coupling support (24) is provided on the side of the coupling support (24). The arc surface of the coupling bracket arc surface fixing platform (241) at the top of the coupling bracket (24) is fixed on the side wall of the coupling panel (251) of the optical coupling component (25); the cavity fixing bracket arc surface fixing platform (231) at the top of the cavity fixing bracket (23) is fixed on the outer ring side wall of the ridge ring (26); and the vertical fixing platform (232) at the bottom of the cavity fixing bracket (23) is fixed on the shielding layer lower cover plate (112) of the shielding layer (1); The shielding layer (1) comprises a shielding layer upper cover plate (111), a shielding layer lower cover plate (112), a shielding cover (12), and a plate-type elastic bracket (13); the plate-type elastic bracket (13) comprises a bracket side plate (136); a horizontal fixing seat (133) is arranged at the top of the bracket side plate (136); a vertical supporting seat (134) is arranged at the bottom of the bracket side plate (136); the middle part of the bracket side plate (136) is connected to the top of the inner support plate (137); the inner support plate (137) is connected to the inner support plate (137); 7) A horizontal support seat (135) is provided at the bottom, an upper cover plate section (14) is provided on the side wall of the shielding layer upper cover plate (111), a horizontal fixing seat (133) is fixed on the upper cover plate section (14), a groove is provided on the side of the horizontal support seat (135), a buffer pad (131) is placed in the groove on the horizontal support seat (135), the buffer pad (131) protrudes from the groove notch and contacts with the shielding layer lower cover plate section (15), and a vertical support seat (134) is fixed on an external operating table; The optical coupling component (25) comprises a coupling panel (251), a reflector (252), a cavity coupling seat (253), and an optical fiber collimator (254); a panel through-column hole is provided in the coupling panel (251); the cavity coupling seat (253) is arranged on the coupling panel (251); a longitudinal through-hole and a transverse hole are provided on the cavity coupling seat (253); the longitudinal through-hole longitudinally penetrates the cavity coupling seat (253); a reflector (252) is provided at the top of the longitudinal through-hole; one end of the transverse hole is connected to the longitudinal through-hole and extends in a direction passing through the reflector (252); the other end of the transverse hole is fixed with the optical fiber collimator (254); the reflector (252) is at a set angle with a horizontal plane; the longitudinal through-hole, the panel through-column hole and the cavity through-column hole are located on the same center line.

2. The portable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The plate-type elastic support (13) comprises a plurality of plates which are rotationally symmetrically distributed around the longitudinal central axis of the cavity support (21).

3. The portable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The cavity fixing brackets (23) are multiple and are distributed rotationally symmetrically around the longitudinal central axis of the cavity support (21); the coupling brackets (24) are multiple and are distributed rotationally symmetrically around the longitudinal central axis of the cavity support (21).

4. The portable optical reference cavity system with a vibration-resistant structure according to claim 3, characterized in that: The number of the cavity fixing brackets (23) and the number of the coupling brackets (24) are the same, and the cavity fixing brackets (23) and the coupling brackets (24) are distributed at equal azimuth intervals.

5. The transportable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The cavity fixing bracket (23) comprises a cavity supporting plate (233), and a cavity fixing bracket arc surface fixing platform (231) and a vertical fixing platform (232) are respectively arranged on the inner side of the top end and the inner side of the bottom end of the cavity supporting plate (233). The cavity fixing bracket arc surface fixing platform (231) comprises a fixing protrusion block (2311), an adapter block (2312) and an arc-shaped fixing block (2313). The fixing protrusion block (2311) is connected to the cavity supporting plate (233), and the inner side surface of the fixing protrusion block (2311) is connected to the outer side surface of the arc-shaped fixing block (2313) via the adapter block (2312). The inner side surface of the arc-shaped fixing block (2313) is an arc surface that matches the outer shape of the ridge ring (26).

6. The transportable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The coupling bracket (24) comprises a coupling plate (242), and a coupling bracket arc surface fixing platform (241) is provided on the inner side of the top end and the inner side of the bottom end of the coupling plate (242). The outer side surface of the coupling bracket arc surface fixing platform (241) is flush with the coupling plate (242), and the inner side surface of the coupling bracket arc surface fixing platform (241) is an arc surface that matches the outer shape of the ridge ring (26).

7. The transportable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The cavity support (21) comprises two symmetrically arranged cones whose cone bottom surfaces are connected, and a ridge ring (26) is provided at the connection between the cone bottom surfaces.

8. The transportable optical reference cavity system with a vibration-resistant structure according to claim 1, characterized in that: The buffer pad (131) is made of polyimide or polytetrafluoroethylene.

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