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A method and device for measuring the focal length of a laser crystal thermal lens using the knife-edge method

A technology for measuring lasers and laser crystals, applied in the field of lasers, can solve the problem of inaccurate thermal lens focal length, etc., and achieve the effect of accurate thermal lens focal length and simple structure

Active Publication Date: 2021-10-15
HARBIN INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used thermal lens focal length measurement methods such as He-Ne direct detection method and resonant cavity stabilization method need to insert other optical components in the laser optical path or change the resonant cavity structure, so that the laser conditions during measurement are different from those during laser operation, resulting in the measured Inaccurate focal length of thermal lens

Method used

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  • A method and device for measuring the focal length of a laser crystal thermal lens using the knife-edge method
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  • A method and device for measuring the focal length of a laser crystal thermal lens using the knife-edge method

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no. 1 approach

[0048] Such as figure 1As shown, according to the first embodiment of the present invention, a method for measuring the thermal focal length of a laser crystal by the knife-edge method provided by the present invention comprises the following steps:

[0049] Build the experimental device, adjust each optical element, and ensure that each optical element is on the same axis (can be adjusted by He-Ne laser alignment method); install a knife edge on a high-precision guide rail to ensure that the guide rail can move in a direction parallel to the optical axis, And the knife edge can cut the light beam, and the knife edge cutting beam is controlled by the micro motor.

[0050] The specific experimental device includes two parts: laser device and measuring device. Wherein, the laser device includes a semiconductor laser 1, a first lens 2, a second lens 3, a first mirror 4, a laser crystal 5, and a second mirror 6; the measuring device includes a third lens 7, a knife edge 8 and an ...

Embodiment approach

[0079] Such as figure 1 As shown, according to the second embodiment of the present invention, the present invention provides a device for measuring the focal length of a laser crystal thermal lens using the knife-edge method, including a laser device and a measuring device;

[0080] Wherein, the laser device includes a semiconductor laser 1, a first lens 2, a second lens 3, a first mirror 4, a laser crystal 5, and a second mirror 6; the measuring device includes a third lens 7, a knife edge 8 and an optical power meter 9;

[0081] The semiconductor laser 1, the first lens 2, the second lens 3, the first reflector 4, the laser crystal 5, the second reflector 6, the third lens 7, the knife edge 8 and the optical power meter 9 are placed on the same axis; The light emitted by the semiconductor laser 1 is collimated by the first lens 2 and then incident on the second lens 3. The second lens 3 focuses the incident light and couples it into the laser crystal 5 through the first ref...

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Abstract

The invention discloses a method and a device for measuring the thermal focal length of a laser crystal in a laser by using the knife-edge method. The measurement method is: measure the beam quality of the output laser by the 90 / 10 knife-edge method, and obtain the spot size and divergence angle of each position of the laser during the transmission process outside the cavity; according to the transmission transformation principle of the laser beam, the second reflection The laser spot and divergence angle size at the mirror 6 place; calculate the spot size at the second mirror 6 place when inserting the thermal lens with focal length f in the resonant cavity, make the spot size of the intracavity oscillation laser at the second mirror 6 place And the divergence angle is the same as the reversed value; the thermal lens focal length of the laser is approximately considered to be f. The invention has the advantages of not needing to insert other optical elements on the laser light path or change the structure of the resonant cavity during the measurement, so that the laser conditions during the measurement are consistent with the operation of the laser, the measurement results are accurate, the device is simple, and the measurement accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of lasers, and relates to a method and a device for measuring the thermal focal length of a laser crystal in a laser by using a knife-edge method. Background technique [0002] Diode pumped solid-state lasers (DPSSL) have the characteristics of compact structure, high efficiency, good stability and long life, and have developed into the most widely used laser light source. Although DPSSL can achieve the matching of pumping wavelength and absorption wavelength and the mode matching of oscillating light and pumping light, compared with the traditional flash lamp-pumped solid-state laser, the influence of thermal effect is greatly reduced, but with the further increase of pump power The thermal effect of the laser medium has a more prominent impact on the performance of the laser. The thermal effect has become an important factor restricting the development of DPSSL to high power and high beam quality. Especia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
CPCG01M11/0292
Inventor 闫仁鹏李旭东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