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CN-116381950-B - Light beam nested type laser beam combining device for obtaining stepped light intensity distribution

CN116381950BCN 116381950 BCN116381950 BCN 116381950BCN-116381950-B

Abstract

The invention discloses a beam nested laser beam combining device for obtaining stepped light intensity distribution. The beam nesting type laser beam combining device comprises a first laser, a conical mirror, a grooved triangular prism and a second laser, wherein the first laser, the conical mirror and the grooved triangular prism are sequentially arranged from left to right, the second laser is arranged above the grooved triangular prism to enable laser beams output by the second laser to vertically enter a groove surface of the grooved triangular prism, the conical mirror is used for converting the laser beams emitted by the first laser into a circular laser beam with zero middle light intensity and gradually enhanced along the radial direction, the grooved triangular prism is used for rotating the emitting direction of the circular laser beam to be parallel to the emitting direction of the second laser beam by 90 degrees without changing the light intensity distribution of the circular laser beam, and the laser beams emitted by the second laser are transmitted out through the groove surface of the grooved triangular prism and are combined with the circular laser beam after rotating by 90 degrees into a nested type laser beam.

Inventors

  • JIN YUSHI
  • DONG YUAN
  • JIN LONG
  • LIU JINGLIANG
  • CHEN XINYU
  • WU CHUNTING
  • JIN GUANGYONG

Assignees

  • 长春理工大学

Dates

Publication Date
20260512
Application Date
20230410

Claims (7)

  1. 1. The light beam nested type laser beam combining device for obtaining the stepped light intensity distribution is characterized by comprising a first laser (1), a conical mirror (2), a grooved triangular prism (3) and a second laser (4), wherein: the first laser (1), the conical mirror (2) and the grooved triangular prism (3) are sequentially arranged from left to right; the second laser (4) is arranged above the grooved triangular prism (3) so that the laser beam output by the second laser is vertically incident to the groove surface of the grooved triangular prism (3); The conical mirror (2) is used for converting the laser beam emitted by the first laser (1) into a circular laser beam with zero middle light intensity and gradually increased along the radial direction, wherein the conical mirror (2) is a lens with different front and back cone angles; the grooving triangular prism (3) is used for rotating the emergent direction of the circular laser beam by 90 degrees to be parallel to the emergent direction of the laser of the second laser (4) without changing the light intensity distribution of the circular laser beam; The laser beam emitted by the second laser (4) is transmitted out through the groove surface of the grooved triangular prism (3), the grooved triangular prism (3) does not change the emitting path of the laser beam, and the transmitted laser beam and the circular laser beam rotated by 90 degrees are combined into a nested laser beam; The first laser (1) and the second laser (4) are light source lasers for synthesizing light beams.
  2. 2. The apparatus according to claim 1, characterized in that the output power of the first laser (1) and the second laser (4) are the same.
  3. 3. The apparatus according to claim 1, characterized in that the first laser (1) and the second laser (4) are semiconductor pumped 532nm fiber green lasers.
  4. 4. The device according to claim 1, characterized in that the cone angle of the cone (2) 40 ° Back taper angle 60 DEG, clear aperture is mm。
  5. 5. The device according to claim 4, characterized in that the conical mirror (2) is a quartz lens.
  6. 6. The device according to claim 1, characterized in that the 45 ° inclined surface of the grooved triangular prism (3) is coated with a highly reflective film and the grooved surface is coated with a highly transmissive film.
  7. 7. The device according to claim 6, characterized in that the grooved triangular prism (3) is made of fused silica.

Description

Light beam nested type laser beam combining device for obtaining stepped light intensity distribution Technical Field The invention belongs to the technical field of laser beam synthesis, and particularly relates to a beam nested laser beam combining device for obtaining stepped light intensity distribution. Background The single laser can only output laser with single wavelength, and is influenced by element performance, structural size and thermal effect, the output laser power can not be infinitely increased, and laser beam combining technology is often adopted to obtain laser beams with higher power. The laser beam combining technology is widely applied to a plurality of fields such as high-power laser components, two-photon imaging, multiphoton resonance ionization, laser pointing, laser welding, laser coverage, surface hardening and the like. The coherent beam combining method has certain requirements on parameters such as wavelength, phase and polarization of laser, so that the technology has complex scheme, poor stability and high implementation technical difficulty under high output power, incoherent beam combining does not need to control the consistency of the parameters such as wavelength, phase and polarization of each beam, has no requirements on a light source, the device is relatively simple, the quality of an outgoing beam basically depends on the beam combining device, and the method has more reliability and practical significance. The prior patent application 201210078189.7 discloses a pulsed laser beam combining scheme, the structure of which is schematically shown in fig. 1. 101-104 are lasers (output ends), 201-204 are plane reflectors, the positions and the placement angles of the plane reflectors are fixed, 101-104 are placed corresponding to the plane reflectors 201-204, and 301 is a rotary reflecting prism. The proposal adopts the technical proposal that a reflection prism with at least one reflection surface is rotated to reflect a plurality of pulse lasers on each reflection surface so as to realize incoherent beam combination. The scheme has the following four defects that a polygon mirror is a 60-face mirror in the scheme, the processing technology is complex, an encoder is matched for use, accurate control can be realized only when the encoder collects azimuth signals of the mirror, reflected light jitter generated when the mirror continuously rotates causes the quality of laser beams to be reduced, the device has certain requirements on a light source laser due to the rotation speed limitation of the rotating mirror, the light source laser can be realized only by using a laser with low repetition frequency, and the light source laser is distributed in a circular arc shape by taking a reflecting rotating prism as the center, so that the distribution situation is complex and difficult to realize. Disclosure of Invention In view of this, the present invention proposes a device for obtaining a nested beam laser beam combination of stepped light intensity distribution. The beam nested laser beam combining device for obtaining the step type light intensity distribution comprises a first laser 1, a conical mirror 2, a grooved triangular prism 3 and a second laser 4, wherein: The first laser 1, the conical mirror 2 and the slotted triangular prism 3 are sequentially arranged from left to right; the second laser 4 is placed above the grooved triangular prism 3, so that the laser beam output by the second laser is vertically incident to the groove surface of the grooved triangular prism 3; The conical mirror 2 is used for converting the laser beam emitted by the first laser 1 into a circular laser beam with zero middle light intensity and gradually increased along the radial direction; The slotted triangular prism 3 is used for rotating the emergent direction of the circular ring-shaped laser beam by 90 degrees to be parallel to the emergent direction of the laser of the second laser 4, and the light intensity distribution of the circular ring-shaped laser beam is not changed; the laser beam emitted by the second laser 4 is transmitted out through the groove surface of the grooved triangular prism 3, the grooved triangular prism 3 does not change the emitting path of the laser beam, and the transmitted laser beam and the circular laser beam rotated by 90 degrees are combined into a nested laser beam; wherein the first laser 1 and the second laser 4 are light source lasers for synthesizing light beams. Wherein the output power of the first laser 1 and the output power of the second laser 4 are the same. Wherein the first laser 1 and the second laser 4 are semiconductor pumped 532nm optical fiber green lasers. Wherein, the conical lens 2 is a lens with different front and back cone angles. Wherein, the front cone angle theta 1 of the conical mirror 2 is 40 degrees, the back cone angle theta 2 is 60 degrees, and the clear aperture is phi 50mm. Wherein the conical lens 2 is a quartz lens.