CN209979910U - Multifunctional super-stable optical reference cavity - Google Patents
Multifunctional super-stable optical reference cavity Download PDFInfo
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- CN209979910U CN209979910U CN201920258281.9U CN201920258281U CN209979910U CN 209979910 U CN209979910 U CN 209979910U CN 201920258281 U CN201920258281 U CN 201920258281U CN 209979910 U CN209979910 U CN 209979910U
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Abstract
The utility model discloses a multifunctional ultrastable optical reference cavity, which comprises a spherical cavity, a support rod and a support frame, wherein the spherical cavity is provided with a light through hole penetrating through the spherical cavity, the central axis of the light through hole passes through the sphere center of the spherical cavity, the light through hole comprises a first light through hole, a second light through hole and a third light through hole, and the first light through hole, the second light through hole and the third light through hole are mutually perpendicular in pairs; the axis of the first light through hole is an X axis, the axis of the second light through hole is a Y axis, and the axis of the third light through hole is a Z axis; the utility model can effectively reduce the low frequency vibration in the three-dimensional direction of the space, and increase the cavity length and reduce the thermal noise without increasing the volume, the mass and other resource conditions; the stability of the effective cavity length of the ultrastable optical reference cavity in the space is improved, namely the frequency stability of the ultra-narrow linewidth laser is improved, and under the condition that resources are not increased, three ultra-narrow linewidth lasers can be realized and performance evaluation and test of the three ultra-narrow linewidth lasers can be completed.
Description
Technical Field
The utility model belongs to super steady optical reference chamber field, concretely relates to multi-functional super steady optical reference chamber.
Background
The ultra-narrow linewidth laser has extremely high spectral purity and frequency stability, is an important means for high-precision measurement, has wide application in the fields of optical clocks, high-precision spectral measurement, gravitational redshift measurement and relativistic examination, very long baseline interference, gravitational wave observation and the like, and has important application prospects in other industrial fields, such as satellite navigation, coherent communication, laser gyros, laser ranging and the like. Typically, ultra-narrow linewidth lasers are implemented by frequency locking the laser light at the resonant frequency of an ultra-stable optical reference cavity using a Pound-Drever-hall (pdh) frequency stabilization technique. Under the condition that the noise of a control loop is negligible, the frequency stability of the ultra-narrow linewidth laser is mainly determined by the stability of the effective cavity length of the ultra-stable optical reference cavity.
At present, low-frequency vibration and thermal noise which affect the length change of an ultra-stable optical reference cavity become main limiting factors for further improving the performance of ultra-narrow linewidth laser. In addition, with the strong and urgent need of space exploration, the development of a spatial super-stable optical reference cavity is urgent, but the spatial super-stable optical reference cavity needs to adapt to the vibration impact of hundreds of gravitational accelerations generated by rocket launching and lifting, the space is strictly restricted in volume, bearing capacity and other resources, the technical index requirement is high, the index testing difficulty is high, and the space needs to be disturbed by vibration (including rotational vibration) in the three-dimensional direction. Under the condition of limited space resources (volume, bearing capacity and the like), only one ultra-narrow linewidth laser is adopted in a general space, and the single ultra-narrow linewidth laser is difficult to realize the test evaluation of technical indexes and performance.
In the prior art, in order to solve the above-mentioned problems of low-frequency vibration and thermal noise affecting the length change of the ultrastable optical reference cavity, the following methods are generally used:
(1) the method for reducing the low-frequency vibration of the ultra-stable optical reference cavity mainly comprises the following steps: the ultra-stable optical reference cavity vibration sensitivity is reduced based on vibration isolator (including active vibration isolation and passive vibration isolation) isolation. It usually uses finite element analysis to optimize the supporting position and shape of the ultrastable optical reference cavity to obtain lower vibration sensitivity. The ground laboratory solves the problem of only one-dimensional main vibration, but does not well solve the problem of reducing three-dimensional (including rotation) vibration sensitivity aiming at space application, and the currently developed transportable (including space) ultrastable optical reference cavity is difficult to realize the performance of low vibration sensitivity in the three-dimensional (including rotation) direction.
(2) A method of reducing thermal noise of an ultrastable optical reference cavity, generally comprising: the cavity length of the super-stable optical reference cavity, low-temperature technology, low-thermal-noise materials and the like are increased. Increasing the cavity length of the optical reference cavity is feasible in a ground laboratory, but under the condition of limited space resources (volume, bearing capacity and the like), the method is certainly not feasible; the low-temperature technology is large in volume and immature in space application, and can greatly reduce thermal noise, but the realization is basically impossible due to limited space resources (volume, bearing capacity and the like); low thermal noise materials often need low temperature technology and higher precision temperature control as a price, and are generally difficult to adapt in space, and mature low thermal noise materials cannot meet the requirements of certain bands, for example, although monocrystalline silicon has lower thermal noise, the monocrystalline silicon must be in a low temperature environment, and can only adapt to the requirements of bands above 1000nm, and cannot adapt to the applications of bands below the monocrystalline silicon.
In summary, in order to improve the stability of the effective cavity length of the super-stable optical reference cavity (i.e. to improve the frequency stability of the super-narrow linewidth laser), methods of reducing the low-frequency vibration of the super-stable optical reference cavity and reducing the thermal noise of the super-stable optical reference cavity are generally used, but the technical means used in the prior art for reducing the low-frequency vibration of the super-stable optical reference cavity and reducing the thermal noise of the super-stable optical reference cavity are only suitable for being applied in a ground laboratory, and two problems will be faced when the above technical means are continuously applied in a space to reduce the low-frequency vibration of the super-stable optical reference cavity and reduce the thermal noise of the super-stable optical reference cavity: firstly, the technical means used in the prior art for reducing the low-frequency vibration of the ultrastable optical reference cavity can only reduce the problem of one-dimensional main vibration in a ground laboratory, and the technical means for reducing the vibration in a three-dimensional (including rotation) direction of a space is not available in the space; secondly, the technical means used in the prior art for reducing the thermal noise of the ultra-stable optical reference cavity cannot be continuously applied in the space due to limited space resources (volume, bearing capacity and the like). In addition, under the condition of limited space resources (volume, bearing capacity and the like), only one ultra-narrow linewidth laser is adopted in a general space, and the single ultra-narrow linewidth laser is difficult to realize the test evaluation of space high technical indexes and performance.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims at providing a multifunctional super-stable optical reference cavity, which realizes the purposes of effectively reducing low-frequency vibration in the three-dimensional direction of the space, increasing the cavity length and reducing thermal noise without increasing the volume, the mass and other resource conditions; the stability of the effective cavity length of the ultrastable optical reference cavity in the space is improved, namely the frequency stability of the ultra-narrow linewidth laser is improved, and under the condition that resources are not increased, three ultra-narrow linewidth lasers can be realized and performance evaluation and test of the three ultra-narrow linewidth lasers can be completed.
In order to achieve the above object, the utility model adopts the technical scheme that a multifunctional ultrastable optical reference cavity comprises a spherical cavity body, a support rod and a support frame, wherein the spherical cavity body is provided with a light through hole penetrating through the spherical cavity body, the central axis of the light through hole passes through the sphere center of the spherical cavity body, the light through hole comprises a first light through hole, a second light through hole and a third light through hole, and the first light through hole, the second light through hole and the third light through hole are mutually perpendicular in pairs; the axis of the first light through hole is an X axis, the axis of the second light through hole is a Y axis, and the axis of the third light through hole is a Z axis;
eight spherical concave grooves are formed in the outer wall of the spherical cavity and are blind holes, the axis of each spherical concave groove points to the center of the sphere of the spherical cavity, and an angle of 54.7 degrees is formed between the axis of each spherical concave groove and the positive directions of X, Y and Z axis;
the spherical cavity is connected with the support frame through a support rod, one end of the support rod is connected with the spherical concave groove, and the other end of the support rod is connected to the support frame.
Furthermore, the support frame is a cubic structure frame, connecting holes are formed in eight top points of the support frame, the spherical cavity is arranged in the support frame, the center of the spherical cavity is overlapped with the center of the support frame, and the central axis of each connecting hole points to the center of the spherical cavity; the support rod is connected with the connecting hole on the support frame.
Furthermore, the two support rods are respectively connected with the spherical cavity through connecting holes at the first diagonal position of the top surface of the support frame, the other two support rods are respectively connected with the spherical cavity through connecting holes at the second diagonal position of the bottom surface of the support frame, and the first diagonal is perpendicular to the second diagonal.
Furthermore, the first light passing hole and the second light passing hole are respectively vertical to the side surface of the support frame.
Furthermore, the support rod comprises a rear-end stressing bolt and a front-end support body, one end of the front-end support body is a ball head convex surface matched with the spherical concave surface groove, and a section of external thread is arranged on the front-end support body at a position far away from the ball head convex surface; the rear end stressing bolt is provided with a section of internal thread hole matched with the external thread on the front end supporting body, and the rear end stressing bolt is also provided with an external thread matched with the internal thread of the connecting hole.
Furthermore, a first exhaust hole is formed in the front end supporting body and is a through hole, a second exhaust hole is formed in the rear end stressing bolt and is a through hole, and the second exhaust hole is communicated with the first exhaust hole.
Furthermore, an air exhaust hole is formed in a spherical concave groove connected with the supporting rod on the spherical cavity, the air exhaust hole is a through hole, and the central axis of the air exhaust hole passes through the center of the spherical cavity.
Further, be swing joint between the bulb convex surface of front end supporter and the spherical concave groove on the spherical cavity all seted up the disc on the spherical cavity of logical unthreaded hole both ends department, disc and logical unthreaded hole mutually perpendicular, the central line and the logical unthreaded hole the central axis coincidence of disc, the both ends of leading to the unthreaded hole all are provided with the hi-lite, the hi-lite is connected with the disc.
Furthermore, the support frame is of an integrated structure, and a triangular plane perpendicular to the central axis of the connecting hole is sectioned at each vertex of the support frame.
The utility model discloses a method for installing multi-functional super steady optics reference chamber, including following step:
the first step is as follows: fixing one surface of the support frame on the surface of the optical platform, and lifting the spherical cavity into the support frame;
the second step is that: screwing the part of the front end support body provided with the external thread into the part of the stressing bolt provided with the internal thread hole until the part is screwed tightly, and sleeving the spring gasket on the stressing bolt at the rear end;
the third step: screwing two rear end stressing bolts into two connecting holes on a first diagonal line on the top surface of the support frame until the required pre-tightening force is reached;
the fourth step: and loosening the connection between the support frame and the optical platform, turning the support frame and the spherical cavity by 180 degrees, fixing the support frame and the optical platform, and screwing the other two rear end stressing bolts into the two connecting holes on the second diagonal line on the bottom surface of the support frame until the required pre-tightening force is reached.
Compared with the prior art the utility model discloses following beneficial effect has at least:
the optical reference cavity is designed with a spherical structure and is optimally designed to support the spherical cavity from four different points. The spherical shape has perfect space structure symmetry, and the spherical shape is supported from four different points in combination with the optimized design, so that the spherical shape has the characteristic of low vibration sensitivity in the space three-dimensional direction, and further the influence of low-frequency vibration in the space three-dimensional direction on the super-stable optical reference cavity is reduced. In addition, the device is combined with a damping device (such as a metal rubber damping spring), and four different point supports of the device can meet the requirements of impact and vibration of hundreds of gravitational acceleration generated by space launching and lifting; the hyperstable optical reference cavity is provided with high reflectors in three directions, so that three hyperstable optical reference cavities can be realized by one cavity, and the vibration sensitivity cannot be deteriorated due to the symmetry of the space structure; the ultra-stable optical reference cavities with different wavelengths can be designed according to requirements, and the ultra-stable optical reference cavities with the same wavelength can also be designed, so that the aim of reducing thermal noise by adopting a multi-cavity multi-optical frequency synthesis technology can be fulfilled under the condition of not increasing the resources such as volume, mass and the like; under the condition of not increasing resources, three ultra-narrow linewidth lasers can be realized, and performance evaluation and test of the three ultra-narrow linewidth lasers can be completed.
Further, the main function of the eight spherical concave grooves arranged on the spherical cavity is as follows: the connection between the support rod and the super-stable optical reference cavity is convenient; the supporting rod is in surface contact with the spherical concave groove of the super-stable optical reference cavity, so that stress concentration is reduced, and damage to the super-stable optical reference cavity is reduced; meanwhile, eight spherical concave grooves are formed in the spherical cavity, structural symmetry is achieved in the space direction, faults occur in other concave grooves, and assembly, adjustment and replacement can be facilitated.
Furthermore, the axes of the spherical concave grooves point to the spherical center of the spherical cavity, and form an angle of 54.7 degrees with the positive directions of X, Y and the Z axis, so that the structural good symmetry can be realized.
Furthermore, the supporting rod is made into a front end supporting body and a rear end stressing bolt, and the length of the supporting rod can be adjusted according to specific conditions; when the front end supporting body is connected with the ultra-stable optical reference cavity, the front end supporting body is made of an elastic body such as Teflon or Turon, and the rear end stressing bolt is made of metal, so that rigid threaded connection between the rear end stressing bolt and the connecting hole is guaranteed.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a spherical cavity structure;
FIG. 3 is a schematic view of the overall structure of a spherical cavity;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a cross-sectional view C-C of FIG. 3;
FIG. 6 is a cross-sectional view taken along line D-D of FIG. 3;
FIG. 7 is a cross-sectional view B-B of FIG. 3;
FIG. 8 is a front view of the support rod of FIG. 1; FIG. 9 is a cross-sectional view A-A of FIG. 8; figure 10 is an isometric view of the brace;
FIG. 11 is a schematic view of the overall structure of the support frame; fig. 12 is an enlarged view of a structure shown in fig. 11.
In the drawings, 1-spherical cavity; 2-high reflection mirror, 3-support frame; 4-rear end stressing bolt, 5-front end support, 6-air extraction hole, 7-spherical concave groove, 8-light through hole and 9-internal thread hole; 10-a first exhaust hole, 101-a second exhaust hole, and 11-a connecting hole; 12-triangular plane.
Detailed Description
The invention is further explained with reference to the drawings and the detailed description below:
the multifunctional ultrastable optical reference cavity shown in fig. 1-7 comprises a spherical cavity 1, a support frame 3 and a support rod, wherein a light through hole 8 penetrating through the spherical cavity is formed in the spherical cavity 1, the central axis of the light through hole 8 passes through the spherical center of the spherical cavity 1, the light through hole 8 comprises a first light through hole 8-1, a second light through hole 8-2 and a third light through hole 8-3, and the first light through hole 8-1, the second light through hole 8-2 and the third light through hole 8-3 are mutually perpendicular in pairs. All seted up the disc on the spherical cavity 1 of both ends department that leads to unthreaded hole 8, disc and the central axis coincidence that leads to unthreaded hole 8 of passing through unthreaded hole 8, the central line of disc all is provided with high speculum 2 with the coincidence of the central axis that leads to unthreaded hole 8, and the mode through the optical cement bonds between high speculum 2 and the disc and is in the same place. Eight spherical concave grooves 7 are formed in the outer wall of the spherical cavity 1, the spherical concave grooves 7 are blind holes, the axis of each spherical concave groove 7 points to the center of the sphere of the spherical cavity 1, and an angle of 54.7 degrees is formed between the axis of each spherical concave groove 7 and the positive directions of X, Y and Z axis; the X axis is coincident with the line of the first light through hole 8-1, the Y axis is coincident with the axis of the second light through hole 8-2, and the Z axis is coincident with the axis of the third light through hole 8-3. An air exhaust hole 6 is formed in a spherical concave groove 7 on the spherical cavity 1, and the central axis of the air exhaust hole 6 passes through the spherical center of the spherical cavity 1.
As shown in fig. 1, 11 and 12, the support frame 3 is a cubic frame, the support frame 3 is an integrated structure, and a triangular plane 12 perpendicular to the connecting hole 11 is cut at each vertex of the support frame 3. Connecting holes 11 are formed in the positions of eight vertex sectioning triangular planes 12 of the support frame 3, the axes of the connecting holes 11 point to the sphere center of the spherical cavity 1, and the connecting holes 11 are threaded holes. The spherical cavity 1 is arranged in the support frame 3 and is connected with the support frame 3 through a support rod, one end of the support rod is connected with the spherical concave groove 7, and the other end of the support rod is connected with a connecting hole 11 on the support frame 3. In this embodiment, the spherical cavity 1 is supported by four common support rods, two of the support rods are connected to the spherical cavity 1 through the connecting holes 11 at the first diagonal position on the top surface of the support frame 3, the other two support rods are connected to the spherical cavity 1 through the connecting holes 11 at the second diagonal position on the bottom surface of the support frame 3, and the first diagonal is perpendicular to the second diagonal.
As shown in fig. 1 and fig. 8-9, the support rod comprises a front end support body 5 and a rear end stressing bolt 4, one end of the front end support body 5 is a ball head convex surface matched with the spherical concave groove 7, and the ball head convex surface far away from the front end support body 5 is provided with a section of external thread; the rear end stressing bolt 4 is provided with a section of internal thread hole 9 matched with the external thread on the front end supporting body 5, and the rear end stressing bolt 4 is also provided with an external thread matched with the internal thread of the connecting hole 11. First exhaust hole 10 has been seted up on the front end supporter 5, has seted up second exhaust hole 101 on the afterbody thrust bolt 4, and the central axis of aspirating hole 6, first exhaust hole 10 and second exhaust hole 101 all is on same straight line.
The utility model discloses a method for installing multi-functional super steady optics reference chamber, including following step:
the first step is as follows: fix a face of support frame 3 on optical platform etc. lift spherical cavity 1 and get into the inside of support frame 3, pay attention to and do not let to collide between spherical cavity 1 and the support frame 3 to avoid damaging spherical cavity 1. Since the spherical cavity 1 is generally manufactured by processing a low expansion glass. If in order to save the size of the support frame 3, the support frame 3 can enter the support frame 3 at a certain angle when being lifted into the support frame, the size of the support frame 3 at the moment must meet the minimum size of the spherical cavity 1, otherwise, the support frame cannot enter the spherical cavity. In addition, when the spherical cavity body is lifted into the support frame 3, protective measures are taken to prevent the spherical cavity body 1 from being polluted;
the second step is that: screwing the part with threads at the rear part of the front end support body 5, namely a cylindrical part, into an internal thread hole 9 formed at the front part of the rear end stressing bolt 4 until the part is screwed tightly, and sleeving a spring gasket into the thread part of the rear end stressing bolt 4;
the third step: screwing the rear end stressing bolt 4 into two connecting holes 11 on a first diagonal line on the top surface of the support frame 3, wherein the connecting holes 11 are threaded holes until the rear end stressing bolt is screwed down and reaches the required pre-tightening force;
the fourth step: and loosening the connection between the support frame 3 and the optical platform, turning the support frame 3 and the spherical cavity 1 for 180 degrees, fixing the support frame 3 and the optical platform, and screwing the other two rear-end stressing bolts 4 into the two connecting holes on the second diagonal line on the bottom surface of the support frame 3 until the bolts are screwed down and the required pre-tightening force is reached.
As shown in fig. 1-12, the present invention comprises 1 spherical cavity 1, i.e. spherical ultrastable optical reference cavity, on which 8 spherical concave grooves are arranged, wherein 54.7 ° angles are formed between the axes of the 8 spherical concave grooves 7 and the axes X, Y and Z, 3 light-passing holes and 4 air-extracting holes are formed; 3 high speculum of group, 4 bracing pieces and 1 support frame 3.
The spherical cavity 1 and the 3 groups of high reflectors 2 form a complete ultrastable optical reference cavity together, and the spherical cavity 1 is mutually matched with 4 support rods through 4 of 8 spherical concave grooves 7 to support the spherical ultrastable optical reference cavity; the cavity is connected with three groups of lenses with high reflectivity (more than 99.99 percent) in three orthogonal directions by means of optical cement, and the spherical cavity 1 is provided with light through holes in 3 orthogonal directions. An air suction hole 6 is arranged in the spherical concave groove 7.
The 3 groups of high-reflectivity lenses are respectively adhered to the three orthogonal directions of the cavity in an optical cement mode, the high-reflectivity mirror is plated with a film layer with reflectivity of more than 99.99%, and the size of the mirror is adopted according to the standard. The coating wave band of the mirror is processed according to actual needs, but two mirrors in the same light through hole direction should be film layers of the same wave band.
In one embodiment of the present invention, the support rod is composed of two parts, namely, a rear end boosting bolt 4 and a front end support 5 made of heat insulating material, one end of the front end support 5 is a spherical structure, the spherical structure is matched with a spherical concave groove 7 on the spherical cavity 1, and the other end of the front end support 5 is connected with the rear end boosting bolt 4 through a thread; the rear end stressing bolt 4 is in threaded connection with the support frame 3, and an elastic gasket is tightly pressed between the rear end stressing bolt 4 and the support frame 3.
The utility model discloses an in certain embodiment, support frame 3 is the integral structure, and it passes through threaded connection with 4 bracing pieces, and in this embodiment, support frame 3 is the cube structure, has all processed triangle-shaped plane 12 in its 8 angle departments, and it has connecting hole 11 to open at triangle-shaped plane 12 center, and connecting hole 11 is the internal thread hole, and this screw hole and 4 threaded connection of rear end afterburning bolt realize spherical cavity 1's afterburning pretension, and support frame 3 bears the atress in whole superstable optical reference chamber.
As shown in the structural diagram of the spherical optical reference cavity in fig. 2 and the internal structural diagram of the spherical cavity in fig. 4-7, three orthogonal light passing holes 8 are arranged on the spherical cavity, and all the three light passing holes pass through the spherical center of the spherical cavity and are arranged along the axial directions of X, Y and Z axes respectively, and the diameter of each light passing hole 8 is determined according to the required spot radius, the curvature radius of the concave reflector and the skill of experimental operation. Two circular surfaces are cut at two ends of the light through hole, the size of each circular surface is determined according to the size of the pasted high-reflection mirror, the circular surfaces are perpendicular to the corresponding light through holes, and the centers of the circular surfaces are overlapped with the axes of the light through holes. The round surface is connected with the high-reflection mirror in a glue polishing mode, the round surface is subjected to fine grinding process, the surface roughness meets the glue polishing requirement, and the mirror surface and the round surface are subjected to glue polishing. The purpose of the light through hole 8 is to allow light to pass through, three groups of high-reflectivity lenses are firmly connected with the spherical cavity 1 in a light through optical cement mode, and each group of reflectors can be divided into: concave and planar mirrors, planar and planar mirrors, concave and concave mirrors, and the like. The type of the film plated on the reflector of each group should be consistent, and the 3 groups of reflectors can be plated with different film types according to the needs.
The axis of each air exhaust hole 6 passes through the center of the sphere, the air exhaust holes 6 are mainly used for facilitating vacuum air exhaust, and the spherical concave grooves are matched with the supporting rods to achieve assembly and fixation of the ultrastable optical reference cavity according to a certain angle and pretightening force.
Fig. 11 to 12 show a structure diagram of a supporting relationship of the chamber, an angle of 54.7 degrees is formed between the axis of the air exhaust hole and the positive directions of X, Y and Z axis respectively, the angle is selected through strict calculation, fig. 11 to 12 show a structure diagram of the support frame, the support frame is an integrated structure, the support frame is seen as a cubic structure from the appearance, the geometric structure and the length of each support column are the same, 8 threaded holes are machined in each support column, the size of each threaded hole is the same as that of the rear end forcing bolt, the axis of each threaded hole is collinear with the axis of the air exhaust hole, and the threaded holes are through holes. The eight corners are provided with 8 triangular planes, three sides of each triangular plane are equal, the lengths of the three sides are adjusted according to actual needs, the three sides are perpendicular to the axis of the threaded hole of the part, and the axis of the threaded hole passes through the geometric center of the triangular plane.
The detailed view of the cavity supporting rod is shown in fig. 8-10, and the cavity supporting rod is composed of a front end supporting body and a rear end stressing bolt, an internal threaded hole is machined in the front portion of the rear end stressing bolt, and the size of the threaded hole is the same as that of the rear end thread of the front end supporting body. An air exhaust hole is processed in the center of the rear end stressing bolt, and the air exhaust hole is a through hole. The front part of the front end support body is provided with a spherical convex surface, the convex surface is matched with the spherical concave groove on the cavity, the center of the front end support body is also provided with a central air suction hole, and the hole is a through hole. The material of the front support should be thermally insulating but must also have certain stiffness requirements.
Claims (9)
1. A multifunctional ultrastable optical reference cavity, characterized by: the light guide plate comprises a spherical cavity (1), a support rod and a support frame (3), wherein a light through hole (8) penetrating through the spherical cavity (1) is formed in the spherical cavity (1), the central axis of the light through hole (8) passes through the spherical center of the spherical cavity (1), the light through hole (8) comprises a first light through hole, a second light through hole and a third light through hole, and the first light through hole, the second light through hole and the third light through hole are mutually perpendicular in pairs; the axis of the first light through hole is an X axis, the axis of the second light through hole is a Y axis, and the axis of the third light through hole (8-3) is a Z axis;
eight spherical concave grooves (7) are formed in the outer wall of the spherical cavity (1), the spherical concave grooves (7) are blind holes, the axis of each spherical concave groove (7) points to the center of the sphere of the spherical cavity (1), and angles of 54.7 degrees are formed between the axis of each spherical concave groove and the positive directions of X, Y and Z axis;
the spherical cavity (1) is connected with the support frame (3) through a support rod, one end of the support rod is connected with the spherical concave groove (7), and the other end of the support rod is connected to the support frame (3).
2. The multifunctional ultrastable optical reference cavity of claim 1, wherein: the supporting frame (3) is a cubic structure frame, connecting holes (11) are formed in eight top points of the supporting frame (3), the spherical cavity (1) is arranged in the supporting frame (3), the center of sphere of the spherical cavity (1) is overlapped with the center of the supporting frame (3), and the central axis of each connecting hole (11) points to the center of sphere of the spherical cavity (1); the supporting rod is connected with a connecting hole (11) on the supporting frame (3).
3. The multifunctional ultrastable optical reference cavity of claim 2, wherein: the two supporting rods are respectively connected with the spherical cavity (1) through connecting holes (11) at the first diagonal positions on the top surface of the supporting frame (3), the other two supporting rods are respectively connected with the spherical cavity (1) through connecting holes (11) at the second diagonal positions on the bottom surface of the supporting frame (3), and the first diagonal is perpendicular to the second diagonal.
4. The multifunctional ultrastable optical reference cavity of claim 1, wherein: the first light through hole and the second light through hole are respectively vertical to the side face of the support frame (3).
5. The multifunctional ultrastable optical reference cavity of claim 2, wherein: the supporting rod comprises a rear end stress application bolt (4) and a front end supporting body (5), one end of the front end supporting body (5) is a ball head convex surface matched with the spherical concave surface groove (7), and a section of external thread is arranged on the position, far away from the ball head convex surface, of the front end supporting body (5); the rear end stressing bolt (4) is provided with a section of internal thread hole (9) matched with the external thread on the front end support body (5), and the rear end stressing bolt (4) is also provided with an external thread matched with the internal thread of the connecting hole (11).
6. The multifunctional ultrastable optical reference cavity of claim 5, wherein: first exhaust hole (10) has been seted up on front end supporter (5), first exhaust hole (10) are the through-hole, second exhaust hole (101) have been seted up on rear end afterburning bolt (4), second exhaust hole (101) are the through-hole and second exhaust hole (101) and first exhaust hole (10) intercommunication.
7. The multifunctional ultrastable optical reference cavity of claim 1, wherein: an air exhaust hole (6) is formed in a spherical concave groove (7) connected with the supporting rod on the spherical cavity (1), the air exhaust hole (6) is a through hole, and the central axis of the air exhaust hole passes through the sphere center of the spherical cavity (1).
8. The multifunctional ultrastable optical reference cavity of claim 5, wherein: be swing joint between the bulb convex surface of front end supporter (5) and spherical concave groove (7) on spherical cavity (1) all seted up the disc on spherical cavity (1) of both ends department that leads to unthreaded hole (8), disc and logical unthreaded hole (8) mutually perpendicular, the central line of disc and logical unthreaded hole (8) the central axis coincidence, the both ends that lead to unthreaded hole (8) all are provided with hi-reflector (2), hi-reflector (2) are connected with the disc.
9. The multifunctional ultrastable optical reference cavity of claim 2, wherein: the supporting frame (3) is of an integrated structure, and a triangular plane (12) vertical to the central axis of the connecting hole (11) is cut at each vertex of the supporting frame (3).
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| CN201920258281.9U CN209979910U (en) | 2019-02-28 | 2019-02-28 | Multifunctional super-stable optical reference cavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828342A (en) * | 2019-02-28 | 2019-05-31 | 中国科学院国家授时中心 | The multi-functional super steady optical reference chamber of one kind and its installation method |
| CN114122888A (en) * | 2021-10-22 | 2022-03-01 | 中国科学院国家授时中心 | Frequency-tunable and transportable frequency-stabilized laser system for optical clock |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109828342A (en) * | 2019-02-28 | 2019-05-31 | 中国科学院国家授时中心 | The multi-functional super steady optical reference chamber of one kind and its installation method |
| CN109828342B (en) * | 2019-02-28 | 2024-03-08 | 中国科学院国家授时中心 | Multifunctional ultra-stable optical reference cavity and mounting method thereof |
| CN114122888A (en) * | 2021-10-22 | 2022-03-01 | 中国科学院国家授时中心 | Frequency-tunable and transportable frequency-stabilized laser system for optical clock |
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