CN110086079B

CN110086079B - Super stable optical cavity

Info

Publication number: CN110086079B
Application number: CN201910371518.9A
Authority: CN
Inventors: 陈群峰; 方鹏程; 陶斌凯
Original assignee: Wuhan Institute of Physics and Mathematics of CAS
Current assignee: Wuhan Institute of Physics and Mathematics of CAS
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2020-12-01
Anticipated expiration: 2039-05-06
Also published as: CN110086079A

Abstract

The invention discloses an ultra-stable optical cavity, which comprises an optical cavity body, wherein the cavity body is provided with a light through hole, a first protrusion, a second protrusion, a third protrusion, a first cavity mirror, a second cavity mirror and an adapter ring.

Description

Super stable optical cavity

Technical Field

The invention belongs to the field of optical experimental equipment, and particularly relates to an ultra-stable optical cavity. The method is suitable for ultrastable laser and optical clock systems and precise measurement physical experiments.

Background

The ultra-stable optical cavity is an essential device for generating ultra-stable laser light as a frequency-locked reference of the laser. The device is mainly used for clock laser and precise measurement physical experiments of the optical clock. In order to improve the frequency stability of the ultrastable laser in experiments, the ultrastable optical cavity must be required to have low vibration sensitivity. The traditional super-stable optical cavity is placed at a plurality of supporting points in order to ensure low vibration sensitivity, and the optical cavity cannot be moved and can only be applied in a laboratory.

With the maturity of the ultrastable laser technology, more and more work requires that the ultrastable laser can be carried and used under a variety of non-laboratory environment mirrors, so the optical cavity is required to have a stable structure while having low vibration sensitivity, can bear certain vibration, does not shift, and is not damaged. In order to meet the requirements, scientists propose various portable ultra-stable optical cavity designs which can meet the carrying requirements to a certain extent, but still have the problems that the extrusion force on the optical cavity is large during installation, so that the optical cavity is coupled with the outside too strongly, or cannot bear large vibration acceleration and impact, and is not suitable for vehicle-mounted, airborne, rocket launching and other scenes.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems of the prior art by providing a super-stable optical cavity.

In order to achieve the purpose, the invention adopts the following technical measures:

a super-stable optical cavity comprises a cavity body, wherein a light through hole is formed in the cavity body, and the central axis of the light through hole is collinear with the central axis of the cavity body; a first end face and a second end face are respectively arranged at two ends of the light through hole, and the first end face and the second end face are parallel and are perpendicular to the central axis of the light through hole; the first protrusion, the second protrusion and the third protrusion are arranged on the outer side of the middle of the cavity in the circumferential direction, the first protrusion, the second protrusion and the third protrusion are evenly distributed on a distribution circle, the circle center of the distribution circle is located on the central axis of the light through hole, the plane of the distribution circle is perpendicular to the central axis of the light through hole, and the plane of the distribution circle is a symmetrical plane of the cavity.

The first end surface and the second end surface are respectively provided with a first cavity mirror and a second cavity mirror which are parallel and are perpendicular to the central axis of the light through hole.

The cavity as described above passes through the adapter ring and the first, second and third protrusions are all connected to the adapter ring.

Compared with the prior art, the invention has the following beneficial effects:

the invention adopts a unique structure, ensures that the ultra-stable optical cavity has a stable structure while having low vibration sensitivity, and can bear large vibration acceleration and impact, so that the ultra-stable optical cavity can be suitable for various non-laboratory environments.

Drawings

FIG. 1 is a schematic structural view of a chamber according to the present invention;

FIG. 2 is a schematic view of the connection of a first cavity mirror and a second cavity mirror of the present invention;

FIG. 3 is a schematic connection diagram of the adapter ring of the present invention;

in the figure, 1-chamber; 2-a light through hole; 3-a first end face; 4-a second end face; 5-a first protuberance; 6-a second protuberance; 7-a third protuberance; 8-a first cavity mirror; 9-a second cavity mirror; 10-adapter ring.

Detailed Description

The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.

As shown in fig. 1 to 3, a super-stable optical cavity includes a cavity 1, a light-passing hole 2 is provided in the cavity 1, and a central axis of the light-passing hole 2 is collinear with a central axis of the cavity 1; a first end face 3 and a second end face 4 are respectively arranged at two ends of the light through hole 2, and the first end face 3 and the second end face 4 are parallel and are perpendicular to the central axis of the light through hole 2; the middle outer side of the cavity 1 is circumferentially provided with a first protrusion 5, a second protrusion 6 and a third protrusion 7, the first protrusion 5, the second protrusion 6 and the third protrusion 7 are uniformly distributed on a distribution circle, the center of the distribution circle is located on the central axis of the light through hole 2, the plane of the distribution circle is perpendicular to the central axis of the light through hole 2, and the plane of the distribution circle is a symmetrical plane of the cavity.

The first end face 3 and the second end face 4 are respectively provided with a first cavity mirror 8 and a second cavity mirror 9, and the first cavity mirror 8 and the second cavity mirror 9 are parallel and are both vertical to the central axis of the light through hole 2.

The cavity 1 passes through the adapter ring 10, and the first protrusion 5, the second protrusion 6 and the third protrusion 7 are connected with the adapter ring 10. And the optical cavity is fixed on other mechanical structures through the adapter ring.

The vibration sensitivity of an optical cavity, i.e. the relationship between the optical cavity length and the vibration acceleration, depends on two factors: firstly, deformation of a cavity under acceleration; secondly, the deformation of the frame of the assembly chamber under acceleration causes a compression of the chamber resulting in a deformation of the chamber. In the design, the cavity 1 has geometric symmetry, the positions and the shapes of the protrusions (5, 6 and 7) also have geometric symmetry, when the cavity 1 is supported by the protrusions (5, 6 and 7), the first-order relation between the cavity length change of the cavity 1 and the vibration acceleration is automatically zero, the cavity length change caused by the deformation of the cavity under the acceleration is minimized, in addition, the number of the protrusions (5, 6 and 7) in the design is 3, the supporting number is reduced while the requirement of cavity fixation is considered, the cavity length change caused by the extrusion of the optical cavity due to the relative deformation and displacement among the protrusions is reduced, and therefore the cavity length change is not sensitive to vibration. The cavity 1 is further fixed to other mechanical structures through the adapter ring 10, so that the influence of external vibration on the optical cavity can be further reduced. Meanwhile, the cavity 1 is fixed to the adapter ring 10 and then to other mechanical structures in a stable and reliable fixing mode, so that the cavity 1 can bear strong vibration without displacement or damage, and the device is suitable for being used in a portable environment and various non-laboratory environments.

As an embodiment, the first protrusion 5, the second protrusion 6 and the third protrusion 7 on the cavity 1 may be formed with the cavity, or may be fixed on the cavity 1 by adhesion or other methods; the material can be the same as or different from that of the cavity 1; the device can be a cylinder and can also be in other shapes.

As another embodiment, the cavity 1 may have a double conical shape, or may have a cylindrical shape or other shapes.

It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A super-stable optical cavity comprises a cavity body (1), and is characterized in that a light through hole (2) is formed in the cavity body (1), and the central axis of the light through hole (2) is collinear with the central axis of the cavity body (1); a first end face (3) and a second end face (4) are respectively arranged at two ends of the light through hole (2), and the first end face (3) and the second end face (4) are parallel and are perpendicular to the central axis of the light through hole (2); a first protrusion (5), a second protrusion (6) and a third protrusion (7) are circumferentially arranged on the outer side of the middle of the cavity (1), the first protrusion (5), the second protrusion (6) and the third protrusion (7) are uniformly distributed on a distribution circle, the center of the distribution circle is located on the central axis of the light through hole (2), the plane of the distribution circle is perpendicular to the central axis of the light through hole (2), and the plane of the distribution circle is the symmetrical plane of the cavity (1),

the first end surface (3) and the second end surface (4) are respectively provided with a first cavity mirror (8) and a second cavity mirror (9), the first cavity mirror (8) and the second cavity mirror (9) are parallel and are both vertical to the central axis of the light through hole (2),

the cavity (1) penetrates through the adapter ring (10), the first protrusion (5), the second protrusion (6) and the third protrusion (7) are all connected with the adapter ring (10),

the first protrusion (5), the second protrusion (6) and the third protrusion (7) are fixed on the cavity (1).