Laser crystal thermal lens focal length online real-time measurement device and method

A real-time measurement, laser crystal technology, applied in the field of lasers, can solve the problems of different focal lengths of laser crystal thermal lenses, differences in measurement values, etc., and achieve the effect of rapid measurement and accurate measurement results

Inactive Publication Date: 2020-05-19
HARBIN INST OF TECH +2
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Problems solved by technology

When the laser is in working and non-working state, due to the effect of stimulated radiation, the focal length of the thermal lens of the laser crystal is different, especially at high pump power, the measured values ​​in the two states will be quite different

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  • Laser crystal thermal lens focal length online real-time measurement device and method
  • Laser crystal thermal lens focal length online real-time measurement device and method
  • Laser crystal thermal lens focal length online real-time measurement device and method

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[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, according to the first embodiment of the present invention, the present invention provides an online real-time measurement device for the focal length of laser crystal thermal lens in LD end-pumped solid-state lasers, including He-Ne laser 1, 5-10 times the first expan...

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Abstract

The invention discloses a laser crystal thermal lens focal length online real-time measurement device and method for an LD end-pumped solid laser. The device comprises a He-Ne laser (1), a 5-10-time first beam expanding system (2), a variable aperture diaphragm (3), a 45-degree 632.8 nm high-reflectivity mirror (4), a beam splitting cube (5), a 45-degree dichroic mirror (6), an attenuation slice group (7), a 2-5-time second beam expanding system (8), a camera (9) and a guide rail (10). The He-Ne light and the laser pump light are adjusted to be strictly transmitted on the same optical axis byutilizing the high-reflectivity mirror (4) and the beam splitting cube (5); and the He-Ne imaging light spot on the camera (9) is as large as possible through the second beam expanding system (8), butcannot exceed the imaging surface element of the camera (9). The device is accurate in measurement result and can quickly achieve the measurement of the thermal focal length of the laser crystal under different pumping powers and provides a powerful guarantee for the compensation design of the laser.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a device and method for online real-time measurement of the focal length of a laser crystal thermal lens in an LD end-pumped solid-state laser. Background technique [0002] In the LD end-pumped solid-state laser, due to the small pump spot and the concentrated pump light energy, the thermal effect of the laser crystal is serious. In order to improve the performance of the laser, thermal lens compensation design is required. Accurately measuring the focal length of the thermal lens of the laser crystal is the key to the compensation design of the LD end-pumped solid-state laser. When the laser is in working and non-working state, due to the effect of stimulated radiation, the focal length of laser crystal thermal lens is different, especially at high pump power, the measured values ​​in the two states will be quite different. At the same time, considering the needs of laser compens...

Claims

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Application Information

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IPC IPC(8): G01M11/02
CPCG01M11/02G01M11/0207
Inventor 李旭东闫仁鹏陈兆东刘志祥王准王建喜丁明伟朱正才樊荣伟董志伟陈德应廖承林
Owner HARBIN INST OF TECH
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