Residual laser collecting device

Abstract

The utility model discloses a residual laser collecting device, belongs to the technical field of lasers, and aims to solve the problems that a laser is polluted, the stability of the laser is influenced, and the use of the laser is influenced by multiple reflections in a laser shell in the prior art. The residual laser collecting device comprises a transmission light path located in a laser and used for residual laser transmission and a collecting cavity located outside the laser. The transmission light path comprises a lens, a frequency doubling crystal, a spectroscope and a reflector; the lens, the frequency doubling crystal and the spectroscope are arranged along the transmission direction of the residual laser, the residual laser is used as incident light, the incident light is transmitted and converged into the frequency doubling crystal through the lens, and emergent laser after passing through the frequency doubling crystal comprises frequency doubling laser and emergent residual laser; the frequency-doubled laser is transmitted to the light path of the other part of the laser through the spectroscope to be output; and the emergent residual laser is reflected by the reflecting mirror and then enters the collecting cavity to be collected.

Description

Technical Field

[0001] The utility model belongs to the technical field of lasers, and in particular relates to a residual laser collection device. Background Art

[0002] During the use of the laser, stray light and residual laser will appear inside the laser, affecting the use of the laser. The treatment of stray light and residual laser in existing lasers is generally to block the light through an aperture or to place a light absorption box in the laser housing to guide the residual laser into the light absorption box. This treatment method will have a better effect on low-power residual laser. However, if the residual laser power is high, the aperture or the light absorption box will heat up due to laser irradiation, which is more likely to cause laser contamination, and local overheating will affect the stability of the laser to a certain extent; on the other hand, the residual laser collection device placed in the cavity is difficult to avoid multiple reflections in the housing after the residual laser is irradiated on its surface.

[0003] In order to avoid the above situation, we proposed a residual laser collection device to solve and optimize the above problems. Utility Model Content

[0004] The utility model aims to provide a residual laser collection device to solve the problems of laser pollution, laser stability influence and multiple reflections in the laser housing affecting the use of the laser in the prior art.

[0005] To achieve the above-mentioned purpose, a residual laser collection device of the utility model comprises a transmission optical path located inside the laser for transmitting the residual laser and a collection cavity located outside the laser;

[0006] The transmission optical path includes a lens, a frequency doubling crystal, a beam splitter and a reflector; the lens, the frequency doubling crystal and the beam splitter are arranged along the transmission direction of the residual laser, the residual laser is used as the incident light, the incident light is transmitted through the lens and converged into the frequency doubling crystal, and the output laser after passing through the frequency doubling crystal includes the frequency doubling laser and the output residual laser; the frequency doubling laser is transmitted through the beam splitter to the optical path of another part of the laser for output; the output residual laser is reflected by the reflector and enters the collecting cavity for collection.

[0007] The laser housing is provided with a stepped through hole in the direction of light reflected by the reflector, wherein the small hole of the stepped through hole is close to the inner wall of the laser housing, and the large hole of the stepped through hole is close to the outer wall of the laser housing;

[0008] The collecting cavity comprises a window mirror and a cover plate; the window mirror and the cover plate are located in the large hole of the stepped through hole and are arranged in sequence along the direction of light reflected by the reflector, and the window mirror, the cover plate and the inner wall of the large hole of the stepped through hole form a cavity; the laser reflected by the reflector is transmitted through the window mirror and irradiated to the cover plate, and is reflected to the inner wall of the large hole of the stepped through hole through the inclined surface on the cover plate.

[0009] A bevel is provided on the axial position of the reflector reflecting light on the side opposite to the cover plate and the window mirror; the laser reflected by the reflector is transmitted to the bevel on the cover plate through the window mirror, a part of the laser incident on the bevel is absorbed, and the other part is reflected by the bevel to the inner wall of the large hole of the stepped through hole.

[0010] The window mirror is coated with an anti-reflection film.

[0011] The inner wall of the large hole of the stepped through hole is provided with an internal thread, and the laser reflected to the inner wall of the large hole of the stepped through hole through the inclined surface is collected through multiple reflections of the internal thread.

[0012] The collecting chamber also includes:

[0013] An O-ring disposed between the window mirror and the bottom of the large hole of the stepped through hole;

[0014] And a pressing ring is arranged at the other end of the window mirror, the pressing ring is threadedly connected with the internal thread, and a through hole is arranged in the middle of the pressing ring for laser to pass through.

[0015] The reflector is plated with a total reflection film.

[0016] The beam splitter is coated with an anti-reflection film and a total reflection film.

[0017] The beneficial effects of the utility model are as follows: a residual laser collection device of the utility model transmits the residual laser through the transmission optical path located inside the laser, and transmits it to the collection cavity located outside, thereby avoiding various unfavorable factors such as overheating pollution caused by the residual laser in the laser, stray light caused by reflection, or local deformation caused by local heating, and will not affect the overall sealing of the laser. Uncontrollable multiple reflections of the residual laser in the laser are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a residual laser collection device of the utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure distribution of a collection cavity in a residual laser collection device of the utility model;

[0020] Among them: 1. lens, 2. frequency doubling crystal, 3. beam splitter, 4. reflector, 5. window mirror, 6. cover plate, 601, inclined plane, 7. laser housing, 701, stepped through hole, 702, internal thread, 8. O-ring, 9. pressing ring. DETAILED DESCRIPTION

[0021] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0022] See also Figure 1 and Figure 2 , a residual laser collection device of the utility model includes a transmission optical path located inside the laser for residual laser transmission and a collection cavity located outside the laser;

[0023] The transmission optical path includes a lens 1, a frequency doubling crystal 2, a beam splitter 3 and a reflector 4; the lens 1, the frequency doubling crystal 2 and the beam splitter 3 are arranged along the transmission direction of the residual laser, the residual laser is used as the incident light, the incident light is transmitted through the lens 1 and converged into the frequency doubling crystal 2, and the output laser after passing through the frequency doubling crystal 2 includes the frequency doubling laser and the output residual laser; the frequency doubling laser is transmitted through the beam splitter 3 to the optical path of another part of the laser for output; the output residual laser is reflected by the reflector 4 and enters the collecting cavity for collection.

[0024] The laser housing 7 is provided with a stepped through hole 701 in the direction of light reflected by the reflector 4, the small hole of the stepped through hole 701 is close to the inner wall of the laser housing 7, and the large hole of the stepped through hole 701 is close to the outer wall of the laser housing 7;

[0025] The collecting cavity includes a window mirror 5 and a cover plate 6; the window mirror 5 and the cover plate 6 are located in the large hole of the stepped through hole 701 and are arranged in sequence along the direction of light reflected by the reflector 4, and the window mirror 5, the cover plate 6 and the inner wall of the large hole of the stepped through hole 701 form a cavity; the laser reflected by the reflector 4 is transmitted through the window mirror 5 and then irradiated to the cover plate 6, and is reflected to the inner wall of the large hole of the stepped through hole 701 through the inclined surface 601 on the cover plate 6.

[0026] A bevel 601 is provided at the axial position where the reflector 4 reflects the light on the side opposite to the cover plate 6 and the window mirror 5; the laser reflected by the reflector 4 is transmitted to the bevel 601 on the cover plate 6 through the window mirror 5, a part of the laser incident on the bevel 601 is absorbed, and the other part is reflected by the bevel 601 to the inner wall of the large hole of the stepped through hole 701.

[0027] The window mirror 5 is coated with an anti-reflection film, which can ensure that the remaining incident laser light is almost completely transmitted and does not return along the optical path.

[0028] The inner wall of the large hole of the stepped through hole 701 is provided with an internal thread 702 , and the laser reflected to the inner wall of the large hole of the stepped through hole 701 by the inclined surface 601 is collected by multiple reflections by the internal thread 702 .

[0029] The collecting chamber also includes:

[0030] An O-ring 8 is disposed between the window mirror 5 and the bottom of the large hole of the stepped through hole 701;

[0031] A pressing ring 9 is arranged at the other end of the window mirror 5, the pressing ring 9 is threadedly connected to the internal thread 702, and a through hole for laser to pass through is arranged in the middle of the pressing ring 9. The window mirror 5 and the O-ring 8 are pressed and sealed by the pressing ring 9, thereby ensuring the sealing of the laser.

[0032] The reflector 4 is plated with a total reflection film.

[0033] The beam splitter 3 is coated with an anti-reflection film and a total reflection film.

[0034] Due to the special structure of the cover plate 6, the inclined surface 601 will continue to reflect the remaining laser light entering through the window mirror 5 to one side until it contacts the internal thread 702. Since the contact part is a threaded structure, diffuse reflection occurs. The remaining laser light will then be reflected and diffusely reflected multiple times in the space formed by the cover plate 6 and the internal thread 702. The inclined surface 601 of the cover plate 6 effectively prevents the remaining laser light irradiated on its surface from returning along the original path, and the diffuse reflection occurring at the internal thread 702 also effectively reduces the power density of the remaining incident laser light irradiated on its surface.

Claims

1. A residual laser collection device, characterized in that: It includes a transmission optical path located inside the laser for transmitting the remaining laser light and a collection cavity located outside the laser; The transmission optical path comprises a lens (1), a frequency doubling crystal (2), a beam splitter (3) and a reflector (4); the lens (1), the frequency doubling crystal (2) and the beam splitter (3) are arranged along the transmission direction of the residual laser, the residual laser is used as incident light, the incident light is transmitted through the lens (1) and converged into the frequency doubling crystal (2), and the output laser after passing through the frequency doubling crystal (2) comprises the frequency doubling laser and the output residual laser; the frequency doubling laser is transmitted through the beam splitter (3) to the optical path of another part of the laser for output; the output residual laser is reflected by the reflector (4) and enters the collection cavity for collection.

2. A residual laser collection device according to claim 1, characterized in that: The laser housing (7) is provided with a stepped through hole (701) in the direction of light reflected by the reflector (4), the small hole of the stepped through hole (701) being close to the inner wall of the laser housing (7), and the large hole of the stepped through hole (701) being close to the outer wall of the laser housing (7); The collecting cavity comprises a window mirror (5) and a cover plate (6); the window mirror (5) and the cover plate (6) are located in a large hole of the stepped through hole (701) and are arranged in sequence along the direction of light reflected by the reflector (4); the window mirror (5), the cover plate (6) and the inner wall of the large hole of the stepped through hole (701) form a cavity; the laser reflected by the reflector (4) is transmitted through the window mirror (5) and then irradiated onto the cover plate (6), and is reflected onto the inner wall of the large hole of the stepped through hole (701) through the inclined surface (601) on the cover plate (6).

3. A residual laser collection device according to claim 2, characterized in that: A bevel (601) is provided at the axial position of the reflective mirror (4) on the side opposite to the cover plate (6) and the window mirror (5) where the reflected light is located; the laser light reflected by the reflective mirror (4) is transmitted to the bevel (601) on the cover plate (6) through the window mirror (5); a portion of the laser light incident on the bevel (601) is absorbed, and another portion of the laser light is reflected through the bevel (601) to the inner wall of the large hole of the stepped through hole (701).

4. A residual laser collection device according to claim 2 or 3, characterized in that: The window mirror (5) is coated with an anti-reflection film.

5. The residual laser light collection device according to claim 3, characterized in that: The inner wall of the large hole of the stepped through hole (701) is provided with an internal thread (702), and the laser reflected by the inclined surface (601) to the inner wall of the large hole of the stepped through hole (701) is collected after multiple reflections by the internal thread (702).

6. A residual laser collection device according to claim 5, characterized in that: The collecting chamber also includes: An O-ring (8) disposed between the window mirror (5) and the bottom of the large hole of the stepped through hole (701); And a pressing ring (9) is arranged at the other end of the window mirror (5), the pressing ring (9) is threadedly connected to the internal thread (702), and a through hole is arranged in the middle of the pressing ring (9) for laser to pass through.

7. A residual laser collection device according to claim 1, 2 or 3, characterized in that: The reflector (4) is plated with a total reflection film.

8. A residual laser collection device according to claim 1, 2 or 3, characterized in that: The beam splitter (3) is coated with an anti-reflection film and a total reflection film.

Images