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Thermal focal length measuring device based on internal focusing collimator

A technology of collimator and measuring device, which is applied in the direction of measuring device, optical instrument test, machine/structural component test, etc. It can solve the problems of many test steps and cumbersome debugging, and achieve the effect of convenient operation and simple structure

Pending Publication Date: 2021-03-16
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Claims
  • Application Information

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Problems solved by technology

The previous thermal focal length measurement methods, such as the probe beam method, need to accurately measure the change of the spot after the probe beam passes through the laser working material; the non-stationary flat cavity method needs to constantly change the position of the cavity mirror, there are many testing steps, and the debugging is cumbersome

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  • Thermal focal length measuring device based on internal focusing collimator
  • Thermal focal length measuring device based on internal focusing collimator

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specific Embodiment approach

[0016] The invention relates to a thermal focal length measurement device based on an internal focusing collimator, which uses the internal focusing collimator to image the reticle placed on the other end of the laser working material when the pump source is not working and working, and through The thermal focal length of the laser working material is obtained by calculating the geometric imaging relationship. The specific implementation is as follows:

[0017] 1. Place a reticle 1 at one end of the laser working substance 2, and place an internal focusing collimator 4 that can display focal length values ​​at the other end.

[0018] 2. The distance between the reticle 1 and the center of the laser working substance 2 is L1.

[0019] 3. Adjust the focal length of the inner focusing collimator 4 to image the reticle 1 placed at the other end of the laser working substance.

[0020] 4. When the pump source 3 is not working, record the focal length of the internal focusing coll...

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Abstract

The invention relates to a thermal focal length measuring device based on an internal focusing collimator, and belongs to the technical field of photoelectricity. A reticle is placed at one end of a laser working substance, and an internal focusing collimator is placed at the other end. When the laser working substance is not pumped, the reticle is imaged by using the internal focusing collimator,and the focal length f1 of the internal focusing collimator at the moment is recorded; and when the laser working substance is pumped, the internal focusing collimator is focused, the reticle is imaged again, and the focal length f2 of the internal focusing collimator at the moment is recorded. According to the focal length difference of the internal focusing collimator before and after pumping and the distance between the reticle and the center of the laser working substance, the thermal focal length of the laser working substance can be calculated through an imaging formula. The thermal focal length is measured by utilizing the focusing characteristic of the internal focusing collimator, and the thermal focal length measuring device is simple in structure, convenient to operate and suitable for measuring the thermal focal lengths of various working substances.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and relates to a thermal focal length measuring device for a working substance in a laser, in particular to a thermal focal length measuring device based on an internal focusing collimator. Background technique [0002] When a high-power laser is working, the laser working substance will often form a thermal lens effect due to uneven heat dissipation, thereby reducing the output power and beam quality of the laser. Therefore, it is necessary to design various measures to compensate the thermal effect of the laser working substance, but the premise is that the thermal focal length of the laser working substance needs to be accurately measured. The previous thermal focal length measurement methods, such as the probe beam method, need to accurately measure the spot change of the probe beam after passing through the laser working material; the non-stationary flat cavity method needs to consta...

Claims

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Application Information

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IPC IPC(8): G01M11/02
CPCG01M11/02G01M11/0207Y02E30/30
Inventor 李毅郝培育
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC