CN214311133U

CN214311133U - Laser beam expanding and collimating device for grating writing

Info

Publication number: CN214311133U
Application number: CN202022885373.5U
Authority: CN
Inventors: 刘峰; 宋立; 张心贲
Original assignee: Changfei Wuhan Photosystem Co ltd
Current assignee: Changfei Wuhan Photosystem Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-09-28
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a laser beam expanding and collimating device for grating inscription, including base, Z axle operating system and slide rail module system. The invention can realize the effect of shaping laser beams including Gaussian spots through the Z-axis lifting system and the sliding rail module system so as to obtain uniform spots which can be used for inscribing gratings. The utility model discloses can the effective control write the energy distribution and the shape size of the required laser of bars for the grating of carving reaches required index and does not harm the covering, improves the side mode rejection simultaneously.

Description

Laser beam expanding and collimating device for grating writing

Technical Field

The utility model belongs to the fiber laser field, concretely relates to laser beam expanding and collimating device for grating inscription.

Background

Fiber bragg gratings have been identified as a critical device among many applications in fiber optic communication and sensing systems and fiber lasers, and have all-fiber structures, low insertion loss, high reflection loss or extinction ratio, and potentially low cost advantages over other technologies. The most prominent characteristic of the fiber grating is that the fiber grating can flexibly realize the required spectral characteristics, and physical parameters of the fiber grating, including refractive index variation, grating length, apodization, periodic chirp, stripe arrangement and the like, are adjusted and changed. The realization of these important properties of fiber gratings depends to a large extent on the fiber grating writing technique. The most developed and widely applied fiber grating writing method is the mask method. The mask method is mainly used for determining the beam expansion and collimation of the laser light spot according to the length of the phase mask or the actual use requirement. The existing grid writing method rarely carries out fine shaping on light beams, so that the following problems exist during grid writing: (1) laser damages the cladding, so that the bearable power of the grating is reduced; (2) the bandwidth index of the written grating cannot be accurately controlled.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough and shortcoming among the prior art, the utility model aims to provide a laser beam expanding and collimating device for grating inscription can change the shape of inscription laser.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

a laser beam expanding and collimating device for grating writing comprises a base 1, a Z-axis lifting system and a sliding rail module system; the Z-axis lifting system comprises two Z-axis supports 2 which are vertically and fixedly arranged with the base 1, a screw rod mounting plate 11 which is fixedly arranged at the upper end of the Z-axis supports 2 and is parallel to the base 1, and a screw rod 6 which is arranged below the screw rod mounting plate 11;

two Z-axis guide rails 4 are fixedly mounted on the base 1, the Z-axis guide rails 4 are positioned between 2Z-axis supports 2, Z-axis sliders 5 are mounted on the Z-axis guide rails 4, the Z-axis sliders 5 are fixedly connected with a Z-axis mounting table 3, a square nut 7 with threads is fixedly mounted on the Z-axis mounting table 3, the square nut 7 corresponds to the lead screw, and the lead screw 6 can rotate in the square nut 7 to drive the Z-axis mounting table 3 to move up and down;

the sliding rail module system comprises a Z-axis mounting seat 301 fixedly connected with the Z-axis mounting table 3, and the Z-axis mounting seat 301 is mounted on the other surface of the Z-axis mounting table 3 opposite to the square nut 7; the Z-axis mounting base 301 is fixedly provided with an X-axis slide rail 9, the X-axis slide rail 9 is provided with a slide block, and each slide block is provided with a light tool mounting plate 13.

Preferably, the number of the Z-axis sliders 5 is at least one.

Preferably, the number of the optical tool mounting plates 13 is determined according to the use condition.

Preferably, the lenticular lens mount 1305, the second diaphragm mount 1304, the lens mount 1301, the first diaphragm mount 1302, and the mirror mount 1303 are sequentially mounted on the optical device mounting plate 13 from left to right.

Preferably, a tail end mounting block 901 and a fixed mounting block 902 are respectively mounted at two ends of the X-axis slide rail 9.

Preferably, a micrometer fixing block 1201 is fixedly mounted on one surface, far away from the Z-axis mounting table 3, of the Z-axis mounting base 301, the position of the micrometer fixing block 1201 corresponds to that of the optical fixture mounting plate 13, a micrometer 12 is mounted on the micrometer fixing block 1201, and a sliding rod 1202 penetrating through the micrometer fixing block 1201 is arranged between the tail end mounting block 901 and the fixed mounting block 902, so that the position of the optical fixture mounting plate 13 is adjusted by adjusting the micrometer 12.

Preferably, a handle 8 is arranged on the upper end surface of the screw rod mounting plate 11, and the handle 8 is matched with the tightening block to adjust the up-and-down movement of the screw rod 6.

Preferably, the front side surface between the tail end mounting block 901 and the fixed mounting block 902 is provided with the scale 10.

Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:

the utility model discloses can effectively control the energy distribution and the shape size of writing the required laser of bars for the abbreviation grating reaches required index and does not harm the covering, improves the side mode suppression ratio simultaneously.

Drawings

Fig. 1 is a schematic structural view of a laser beam expanding and collimating device for grating writing.

Fig. 2 is a schematic structural view of another angle of the laser beam expanding and collimating apparatus for grating writing.

Fig. 3 is a schematic structural diagram of a left side view angle of the laser beam expanding and collimating apparatus for grating writing (in which some parts are omitted).

Fig. 4 is a schematic structural view of an X-axis slide rail of a laser beam expanding and collimating apparatus for grating writing.

Detailed Description

The present invention is further described with reference to the following specific examples, which are not intended to limit the invention.

Referring to fig. 1 to 4, a laser beam expanding and collimating device for grating writing comprises a base 1, a Z-axis lifting system and a sliding rail module system; the Z-axis lifting system comprises two Z-axis supports 2 which are vertically and fixedly arranged with the base 1, a screw rod mounting plate 11 which is fixedly arranged at the upper end of the Z-axis supports 2 and is parallel to the base 1, and a screw rod 6 which is arranged below the screw rod mounting plate 11;

Preferably, the optical device mounting plate 13 is sequentially mounted with a second diaphragm mounting seat 1304, a cylindrical lens mounting seat 1305, a lens seat 1301, a first diaphragm seat 1302, and a mirror mounting seat 1303.

Taking the collimation of a gaussian spot as an example, it has been proven theoretically and practically that, among the possible forms of laser beam, the fundamental mode gaussian beam is the most important and most typical. The gaussian beam is focused to increase the optical power density of the laser, and the collimated beam is collimated to reduce the divergence angle and increase the energy transport distance.

The working process is as follows: the reflector mounting base 1303 is provided with a reflector, and the laser is mounted beside the reflector to realize the direction change of the laser; lens mount 1301 adorns the camera lens, diaphragm mount 1302 dress diaphragm, expand beam and collimation to laser, second diaphragm mount pad 1304 dress diaphragm, the size of laser spot after expanding according to actual required control, specifically be the regulation through handle 8, drive the up-and-down motion of Z axle mount table 3, and then drive the up-and-down motion of X axle slide rail 9 through Z axle mount pad 301, horizontal slip through X axle slide rail 9, through the removal of each optical element on micrometer 12 and the supplementary light utensil mounting panel 13 of scale 10, make each optical element on the light utensil mounting panel 13 can both be in suitable position. The cylindrical lens mount 1305 mounts the cylindrical lens to compress the final laser spot, so that the laser used for writing the grating is completely focused on the fiber core, and the laser is prevented from diffusing and damaging the cladding in the grating writing process.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. A laser beam expanding and collimating device for grating writing is characterized by comprising a base (1), a Z-axis lifting system and a sliding rail module system; the Z-axis lifting system comprises two Z-axis supports (2) which are vertically and fixedly arranged with the base (1), a screw rod mounting plate (11) which is fixedly arranged at the upper end of each Z-axis support (2) and is parallel to the base (1), and a screw rod (6) arranged below the screw rod mounting plate (11);

two Z-axis guide rails (4) are fixedly mounted on a base (1), the Z-axis guide rails (4) are located between two Z-axis supports (2), Z-axis sliders (5) are mounted on the Z-axis guide rails (4), Z-axis mounting tables (3) are fixedly connected with the Z-axis sliders (5), threaded square nuts (7) are fixedly mounted on the Z-axis mounting tables (3), the square nuts (7) correspond to the lead screws in positions, and the lead screws (6) can rotate in the square nuts (7) to drive the Z-axis mounting tables (3) to move up and down;

the sliding rail module system comprises a Z-axis mounting seat (301) fixedly connected with the Z-axis mounting table (3), and the Z-axis mounting seat (301) is mounted on the other surface of the Z-axis mounting table (3) opposite to the square nut (7); an X-axis sliding rail (9) is fixedly mounted on the Z-axis mounting seat (301), sliding blocks are mounted on the X-axis sliding rail (9), and a light fixture mounting plate (13) is mounted on each sliding block.

2. The laser beam expanding and collimating device for grating writing according to claim 1, characterized in that the number of the Z-axis sliders (5) is at least one.

3. The laser beam expanding and collimating device for grating writing of claim 1, wherein the number of said optical tool mounting plates (13) is determined according to the usage.

4. The laser expanded beam collimation device for grating writing of claim 2, wherein a cylindrical lens mounting seat (1305), a second diaphragm mounting seat (1304), a lens seat (1301), a first diaphragm seat (1302) and a reflector mounting seat (1303) are sequentially mounted on the optical tool mounting plate (13) from left to right.

5. The laser beam expanding and collimating device for grating writing of claim 1, wherein a tail end mounting block (901) and a fixed mounting block (902) are respectively mounted at two ends of the X-axis sliding rail (9).

6. The laser beam expanding and collimating device for grating writing according to claim 1, wherein a micrometer fixing block (1201) is fixedly mounted on a surface of the Z-axis mounting base (301) far away from the Z-axis mounting table (3), the position of the micrometer fixing block (1201) corresponds to the optical instrument mounting plate (13), a micrometer (12) is mounted on the micrometer fixing block (1201), and a sliding rod (1202) penetrating through the micrometer fixing block (1201) is arranged between the tail end mounting block (901) and the fixed mounting block (902), so that the position of the optical instrument mounting plate (13) is adjusted by adjusting the micrometer (12).

7. The laser beam expanding and collimating device for grating writing according to claim 1, wherein a handle (8) is disposed on the upper end surface of the screw mounting plate (11), and the handle (8) cooperates with the tightening block to adjust the up-and-down movement of the screw (6).

8. The laser expanded beam collimation device for grating writing according to claim 5, wherein a scale (10) is arranged on the front side surface between the tail end mounting block (901) and the fixed mounting block (902).