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Measuring method of geometric size distribution of kdp crystal needle damage points

A technology of geometric dimensions and measurement methods, which is applied in the directions of measuring devices, analyzing materials, optical testing defects/defects, etc., can solve the problems of increased crystal scattering loss, damage of downstream optical components, and increased ratio of downstream beams of crystals, etc., to improve measurement Accuracy, effect of eliminating birefringence effect

Inactive Publication Date: 2018-08-28
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Body damage is manifested as numerous (up to ~10 3 / mm 3 ) needle-shaped damage point, the appearance of body damage will lead to an increase in the scattering loss of the crystal on the one hand, and on the other hand it will also cause an increase in the contrast of the downstream beam of the crystal, thereby inducing damage to the downstream optical components, so the body damage of the KDP crystal is the limit laser inertial constraint One of the bottlenecks in the output capability of fusion drives

Method used

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  • Measuring method of geometric size distribution of kdp crystal needle damage points

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Experimental program
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Effect test

Embodiment 1

[0064] A measuring device for measuring the geometric size distribution of needle-shaped damage points in KDP crystals, including a test laser 1, an energy attenuation device 2, a first reflector 3, a second reflector 4, an optical wedge 5, a first polarizer 6, a half-wave Sheet 7, second cylindrical lens 8, three-dimensional translation stage 9, third mirror 11, third cylindrical lens 12, detection laser 13, microscope 14, PC computer 15, energy meter 16, CCD camera 17, first cylindrical lens 18 , controller 19 and first polarizer 20;

[0065] The test light generated by the test laser 1 passes through the energy attenuation device 2, the first reflector 3, and the second reflector 4 in turn, and then enters the optical wedge 5, and a part of the test light is reflected on the front surface of the optical wedge 5 to form the first reflection Test light, the first reflected test light is imaged to the CCD camera 17 after the first cylindrical lens 18; a part of the test light ...

Embodiment 2

[0067] On the basis of the first embodiment, the probe light incident on the sample 10 to be tested and the transmitted test light incident on the sample 10 to be tested are transmitted collinearly in opposite directions.

Embodiment 3

[0069] On the basis of Embodiment 1 or Embodiment 2, the detection laser 13 is a white light source or a broadband light source.

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Abstract

The invention discloses a measuring device and method for geometric size distribution of needle damage loci formed in an KDP crystal subjected to nanosecond laser pulses, and belongs to a measuring device and method for KDP crystal damage in the technical field of KDP crystals. A damage threshold is generally used for evaluating damage-resistant properties of optical elements including crystals, but the damage threshold itself has the probability and is prone to be affected by testing conditions, testing methods, testing parameters and data processing. The geometric size distribution of the needle damage loci in the crystal serves as an evaluation criterion for evaluating the damage-resistant property of the crystal, and the corresponding testing method and device are provided. The evaluation criterion and the testing method thereof can overcome the defects of the damage threshold and a testing method thereof.

Description

technical field [0001] The invention relates to the technical field of KDP crystals, and relates to a method for measuring body damage of KDP crystals. Background technique [0002] Potassium dihydrogen phosphate (KDP) crystal is a highly valued functional crystal. The artificial growth of KDP crystal has a history of more than half a century, and it is one of the enduring water-soluble crystals. [0003] Since the KDP crystal can grow to a large (~50cm) geometric size at a relatively fast growth rate (~10mm / day), it is the only electro-optic switch and frequency conversion non-conductor that meets the requirements in the current laser inertial confinement fusion driver. linear material. The anti-damage performance of the crystal is an important technical index of the crystal. Existing experiments have confirmed that the damage threshold of the KDP crystal under the action of nanosecond pulses is at least an order of magnitude lower than the intrinsic damage threshold of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
CPCG01N21/8851G01N2021/8874G01N2021/8887
Inventor 郑垠波丁磊周信达巴荣声袁静徐洪磊那进李亚军姜宏振张霖杨晓瑜柴立群陈波
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS