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Crystal laser pretreatment and point-to-point damage testing device and testing method

A technology of laser preprocessing and testing equipment, which is applied in the direction of measuring equipment, optical testing of flaws/defects, and material analysis through optical means. and other problems to achieve the effect of finding points with high precision and high accuracy

Active Publication Date: 2017-05-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the laser pretreatment of optical components, there is no laser damage threshold test process, and the non-contact detection system alone cannot accurately evaluate the pretreatment effect of different laser parameters, and cannot achieve online point-to-point damage testing
These two patents mainly monitor the surface and sub-surface of the optical element, and there is no corresponding monitoring method for the pretreatment and damage of the element body, and neither of the two patents has a technical means to ensure that the pretreatment laser is vertically incident on the optical element

Method used

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  • Crystal laser pretreatment and point-to-point damage testing device and testing method
  • Crystal laser pretreatment and point-to-point damage testing device and testing method

Examples

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Effect test

Embodiment 1

[0046] A crystal laser pretreatment and point-to-point damage testing device, including a sub-nanosecond laser and a nanosecond laser arranged side by side;

[0047] One end of the nanosecond laser is provided with a half-wave plate and a first plane reflector; the half-wave plate is used to change the horizontally polarized light emitted by the nanosecond laser into vertically polarized light;

[0048] One end of the sub-nanosecond laser is provided with a polarizer, a focusing lens, a wedge plate, a small hole diaphragm, a sample crystal to be tested, and a small hole diaphragm, and one side of the wedge plate is equipped with an energy meter, a spot analyzer, a spot analyzer and a computer. The two sides of the sample crystal to be tested are respectively equipped with a He-Ne laser and a CCD camera, and the CCD camera is connected to the computer. The polarizer completely reflects the vertically polarized laser pulse and completely transmits the horizontally polarized laser...

Embodiment 2

[0053] A crystal laser pretreatment and point-to-point damage testing device, the structure of which is as described in Embodiment 1, the difference is that the number of small hole apertures between the wedge plate and the sample crystal to be tested is two. The laser light path of the sub-nanosecond laser pretreatment is determined by two aperture apertures. The relative positional relationship between the aperture aperture and the sample crystal to be tested is fixed. In the subsequent point-to-point damage test, the nanosecond laser is adjusted so that it also It can just pass through these two small apertures, and the strict collinearity of the sub-nanosecond laser pulse and the nanosecond laser pulse ensures that the pretreatment point of the sub-nanosecond laser pulse on the sample crystal to be tested is the point-to-point of the nanosecond laser pulse Online Damage Threshold Test Point.

Embodiment 3

[0055] A crystal laser pretreatment and point-to-point damage testing device, its structure is as described in Embodiment 1, the difference is that three CCD cameras are provided on one side of the sample crystal to be tested, and three He-Ne lasers are provided on the other side of the sample crystal to be tested . Three He-Ne lasers and three CCD cameras are used to observe the damage of the front surface, body and back surface of the sample crystal to be tested, and the observation is more three-dimensional and comprehensive.

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Abstract

The invention relates to a crystal laser pretreatment and point-to-point damage testing device and testing method, which belong to the fields of laser pretreatment and damage testing. The testing method comprises laser pretreatment of a subnanosecond laser pulse on a crystal of a sample to be tested, and on-line damage threshold test of a nanosecond laser pulse on pretreatment points of the crystal of the sample to be tested. Through a half wavelength plate, a polarizing film and an aperture diaphragm in the testing device, collineation of the subnanosecond laser pulse and the nanosecond laser pulse is realized, so that the on-line point-to-point damage threshold test of the crystal is accurately realized. The invention provides a simple and effective testing method and testing device, so that the problem that the pretreatment points are hard to find accurately caused by the fact that the crystal is pretreated and is then subjected to the damage threshold test is effectively solved, the on-line damage threshold test of the crystal after pretreatment can be realized, and the device has the characteristics of simple structure, easiness in operation, and accuracy in finding the points.

Description

technical field [0001] The invention relates to a crystal laser pretreatment and point-to-point damage testing device and testing method, in particular to a testing method and testing device for accurately finding laser preprocessing points on a crystal online, and belongs to the field of laser preprocessing and damage testing of optical components. Background technique [0002] In the current inertial confinement laser driver and other applications involving high-energy laser frequency conversion, the damage problem of frequency conversion crystal has been an important factor limiting the increase of laser energy. The method to improve the crystal damage threshold is usually to pretreat the crystal with sub-nanosecond ultraviolet pulsed laser. The method is to place the crystal on the focal plane and accept focused laser irradiation with an energy lower than its damage threshold, gradually increase the energy density of laser irradiation, and then increase the damage thresh...

Claims

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Application Information

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IPC IPC(8): G01N21/88
CPCG01N21/8806
Inventor 程文雍王军华李晓芳杨厚文李大振
Owner SHANDONG UNIV
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