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CN-224233131-U - Laser linear adjusting system

CN224233131UCN 224233131 UCN224233131 UCN 224233131UCN-224233131-U

Abstract

The disclosure provides a laser linear adjusting system, which comprises a pumping light source (1), a frequency doubling crystal (2), a mode selection module (3), a low-pass filter (4), a beam expander (5) and a polarization attenuator (6) which are sequentially arranged along an optical path, wherein the pumping light source (1) generates a first light beam, the first light beam is incident to the frequency doubling crystal (2) and is subjected to frequency boosting through the frequency doubling crystal to obtain a second light beam, the second light beam is incident to the mode selection module (3) and is emitted to a third light beam, the third light beam is incident to the low-pass filter (4) and is emitted to a fourth light beam, the fourth light beam is incident to the beam expander (5) and is emitted to the polarization attenuator (6), the fifth light beam is emitted from the polarization attenuator (6), when the angle of the polarization sheet in the polarization attenuator (6) is changed, the energy of the fifth light beam emitted from the polarization attenuator (6) is linearly changed, and the service life of the polarization sheet when the power supply voltage of the pumping light source is adjusted is prolonged.

Inventors

  • LI FUYUN
  • PAN MENGMEI
  • LI RUIFENG
  • DING YUNFENG
  • DUAN CHUANKAI

Assignees

  • 李复云

Dates

Publication Date
20260512
Application Date
20250718

Claims (10)

  1. 1. The laser linear adjusting system is characterized in that a pumping light source (1), a frequency doubling crystal (2), a mode selection module (3), a low-pass filter (4), a beam expander (5) and a polarization attenuator (6) are sequentially arranged along an optical path; The pumping light source (1) generates a first light beam, the first light beam is incident to the frequency doubling crystal (2), and the frequency doubling crystal (2) improves the frequency of the first light beam to obtain a second light beam; the second light beam is incident to the mode selection module (3), and a third light beam is emitted from the mode selection module (3), wherein the divergence angle of the third light beam is smaller than that of the second light beam, and the spot diameter of the third light beam is smaller than that of the second light beam; The third light beam is incident to a low-pass filter (4), and a fourth light beam is emitted from the low-pass filter (4); The fourth light beam is incident to the beam expander (5), and a fifth light beam is emitted from the beam expander (5), wherein the spot diameter of the fifth light beam is larger than that of the fourth light beam; The fourth light beam is incident on the polarization attenuator (6), the fifth light beam is emitted from the polarization attenuator (6), and the energy of the fifth light beam emitted from the polarization attenuator (6) is linearly changed in response to the angle change of the polarizing plate in the polarization attenuator (6).
  2. 2. The system according to claim 1, characterized in that the pump light source (1) comprises a total reflection mirror (7), a Q-switch crystal (8), a polarizer (9), a solid state laser module (10) and an output mirror (11) in the light path direction.
  3. 3. The system of claim 2, wherein the system further comprises a controller configured to control the controller, The distance between the total reflecting mirror (7) and the Q-switch crystal (8) is 60mm; The distance between the Q-switch crystal (8) and the polaroid (9) is 10mm; the distance between the polaroid (9) and the solid laser module (10) is 50mm; The distance between the solid laser module (10) and the output mirror (11) is 70mm.
  4. 4. The system of claim 1, wherein the system further comprises a controller configured to control the controller, The distance between the pumping light source (1) and the frequency doubling crystal (2) is 70mm; the distance between the frequency doubling crystal (2) and the mode selection module (3) is 10mm; the distance between the mode selection module (3) and the low-pass filter (4) is 20mm; the distance between the low-pass filter (4) and the beam expander (5) is 25mm; the distance between the beam expander (5) and the polarization attenuator (6) is more than or equal to 244.4mm.
  5. 5. The system according to claim 1, characterized in that the mode selection module (3) comprises an aperture stop; and responding to the diameter of the small hole diaphragm being 1mm, and taking the light spot mode as a fundamental mode.
  6. 6. The system according to claim 1, characterized in that the frequency doubling crystal (2) is arranged to boost the frequency of the first light beam such that the frequency of the second light beam is 2 times the frequency of the first light beam.
  7. 7. The system of claim 1, wherein the system further comprises a controller configured to control the controller, The low-pass filter (4) is used for filtering fundamental frequency light and enabling light beams with the wavelength of 532nm to pass through.
  8. 8. The system according to claim 1, characterized in that the beam expander (5) is a plano-concave lens with an operating wavelength of 400nm to 700nm.
  9. 9. The system according to claim 1, characterized in that the extinction ratio of the polarizer of the polarization attenuator (6) is greater than 1000:1, the damage threshold is 50mJ/mm 2 , and the operating wavelength is 400nm to 700nm.
  10. 10. The system according to claim 1, characterized in that the beam expander (5) comprises an objective lens and an eyepiece lens; The focal length of the objective lens is 25mm, and the diameter of the objective lens is 12.5mm; The focal length of the ocular is 50mm and the diameter is 12.5mm.

Description

Laser linear adjusting system Technical Field The disclosure relates to the field of optical technology, and in particular, to a laser linear adjustment system. Background In the related art, the energy of the laser emitted by the pumping light source is changed by adjusting the power supply voltage of the pumping light source, but the energy change is nonlinear, and the polarization plate is easy to burn out by high-power laser due to low damage resistance threshold value of the polarization plate, and the polarization plate is extremely easy to damage due to the nonlinearity of the energy change when the power supply voltage of the pumping light source is adjusted. Disclosure of utility model The present disclosure provides a laser linear adjustment system to at least solve the above technical problems existing in the prior art. The present disclosure provides a laser linear adjustment system, which is sequentially provided with a pumping light source 1, a frequency doubling crystal 2, a mode selection module 3, a low-pass filter 4, a beam expander 5 and a polarization attenuator 6 along an optical path; The pumping light source 1 generates a first light beam, the first light beam is incident to the frequency doubling crystal 2, and the frequency doubling crystal 2 raises the frequency of the first light beam to obtain a second light beam; The second light beam is incident to the mode selection module 3, and a third light beam is emitted from the mode selection module 3, wherein the divergence angle of the third light beam is smaller than that of the second light beam, and the spot diameter of the third light beam is smaller than that of the second light beam; the third light beam enters a low-pass filter 4, and a fourth light beam is emitted from the low-pass filter 4; The fourth light beam is incident to the beam expander 5, and a fifth light beam is emitted from the beam expander 5, wherein the spot diameter of the fifth light beam is larger than that of the fourth light beam; The fourth light beam enters the polarization attenuator 6, the fifth light beam is emitted from the polarization attenuator 6, and the energy of the fifth light beam emitted from the polarization attenuator 6 is linearly changed in response to the angle change of the polarizing plate in the polarization attenuator 6. In the above-described scheme, the pump light source 1 includes the total reflection mirror 7, the Q-switch crystal 8, the polarizing plate 9, the solid laser module 10, and the output mirror 11 in the optical path direction. In the scheme, the distance between the total reflecting mirror 7 and the Q-switch crystal 8 is 60mm; the distance between the Q-switch crystal 8 and the polarizing plate 9 was 10mm; the distance between the polarizer 9 and the solid laser module 10 was 50mm; the distance between the solid state laser module 10 and the output mirror 11 was 70mm. In the above scheme, the distance between the pump light source 1 and the frequency doubling crystal 2 is 70mm; The distance between the frequency doubling crystal 2 and the mode selection module 3 is 10mm; The distance between the mode selection module 3 and the low-pass filter 4 is 20mm; the distance between the low-pass filter 4 and the beam expander 5 is 25mm; The distance between the beam expander 5 and the polarization attenuator 6 is greater than or equal to 244.4mm. In the above scheme, the mode selection module 3 includes a small aperture diaphragm; and responding to the diameter of the small hole diaphragm being 1mm, and taking the light spot mode as a fundamental mode. In the above scheme, the frequency doubling crystal 2 is configured to boost the frequency of the first light beam, so that the frequency of the second light beam is 2 times that of the first light beam. In the above scheme, the low-pass filter 4 is configured to filter fundamental frequency light, and let light with a wavelength of 532nm pass. In the above scheme, the beam expander 5 is a plano-concave lens, and the working wavelength is 400nm to 700nm. In the scheme, the extinction ratio of the polaroid of the polarization attenuator 6 is larger than 1000:1, the damage threshold is 50mJ/mm < 2 >, and the working wavelength is 400nm to 700nm. In the above-mentioned scheme, the beam expander 5 includes an objective lens and an eyepiece; The focal length of the objective lens is 25mm, and the diameter of the objective lens is 12.5mm; The focal length of the ocular is 50mm and the diameter is 12.5mm. According to the laser linear adjusting system provided by the embodiment of the disclosure, after the first light beam emitted by the pump light source 1 is transmitted to the polarization attenuator 6 through each optical device by the pump light source 1, the frequency doubling crystal 2, the mode selection module 3, the low-pass filter 4, the beam expander 5 and the polarization attenuator 6 which are designed along the light path, the energy of the emergent light beam is linearl