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KDP or DKDP crystal body damage performance high-precision measuring device and measuring method

A measurement method and high-precision technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to obtain the three-dimensional distribution of crystal body damage points, high measurement uncertainty, and mutual occlusion of damage points, so as to achieve convenient debugging, Characterize comprehensive, deliquescence prevention effect

Active Publication Date: 2021-10-08
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is: in order to solve the problems of low lateral resolution, mutual shielding of damage points, high measurement uncertainty and inability to obtain three-dimensional distribution of crystal body damage points in the existing KDP or DKDP crystal body damage measurement, the present invention provides a KDP or DKDP crystal body damage performance high-precision measuring device and measuring method

Method used

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  • KDP or DKDP crystal body damage performance high-precision measuring device and measuring method

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Experimental program
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Effect test

Embodiment 1

[0052] Such as figure 1 As shown, this embodiment provides a high-precision measurement device for KDP or DKDP crystal body damage performance, including a laser 1, a first mirror 3, a second mirror 2, an energy meter 4, a polarizer 5, and a 1 / 2 wave plate 6. Focusing lens 7, optical wedge 8, CCD camera 15, photocell 16, oscilloscope 17, three-dimensional translation stage 10, ring light source 9, broadband polarizer 13, microscope 14, absorption trap 12 and PC computer 18, also includes two-dimensional The translation stage 11 and two translation stage drive controllers (not shown) connected to the two-dimensional translation stage 11 and the three-dimensional translation stage 10 respectively, the field of view of the microscope 14 can be spliced ​​and larger than the spot on the crystal sample to be measured The size and lateral resolution of the microscope 14 are less than 1 μm, the working distance of the microscope 14 is greater than the thickness of the crystal sample t...

Embodiment 2

[0072] This embodiment is further optimized on the basis of Embodiment 1, specifically:

[0073] In S4, the two-dimensional translation stage 11 and the three-dimensional translation stage 10 are controlled by the PC computer 18, so that the microscope 14 performs three-dimensional tomographic photography of the area to be tested, specifically:

[0074] S4.1: Record the three-dimensional coordinates of the shooting starting point, and control the drive controller of the translation platform through the PC computer 18, thereby controlling the movement of the two-dimensional translation platform 11, so that the microscope 14 laterally photographs a certain tomographic surface of the area to be measured;

[0075] S4.2: After the horizontal shooting of the tomographic surface is completed, the three-dimensional translation stage 10 is controlled by the PC computer 18, so that the three-dimensional translation stage 10 is stepped along the longitudinal direction of the crystal sampl...

Embodiment 3

[0079] This embodiment is further optimized on the basis of Embodiment 1, specifically:

[0080] Described S6 specifically comprises the following steps:

[0081] S6.1: Use 3D image processing software, such as Avizo, Amira, etc., to subtract the picture before damage measurement from the picture after damage measurement to obtain the damage map after pulse action;

[0082] S6.2: Eliminate the impact of the surface factors of the crystal sample to be tested on the pulse effect, solve the problems of repeated statistics of damage points, background light elimination, binarization, etc., and use the image moment algorithm to find the centroid of each scattering point;

[0083]S6.3: Perform three-dimensional reconstruction on all tomographic images of the damage map after excluding the influence, and obtain the three-dimensional distribution of damage points in the crystal body;

[0084] S6.4: Analyze the image obtained after three-dimensional reconstruction to obtain the number...

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Abstract

The invention discloses a KDP or DKDP crystal body damage performance high-precision measurement device and measurement method, and relates to the technical field of KDP or DKDP crystal body damage measurement. The invention firstly obtains the crystal after high-power nanosecond laser pulse action through the method of tomography Based on the basic data of volume damage points, problems such as repeated statistics of damage points, background light elimination, and binarization are solved, and the centroid of each scattering point is obtained by using the image moment algorithm, and then the three-dimensional distribution of volume damage points is obtained through the reconstruction algorithm, and then Three individual damage characterization parameters such as crystal body damage density ppd, body damage point geometric size distribution pps, and crystal body damage point three-dimensional distribution are obtained with high precision. The present invention has the advantages of high measurement accuracy and more comprehensive crystal body damage characterization.

Description

technical field [0001] The invention relates to the technical field of KDP or DKDP crystal body damage measurement, and more particularly relates to a high-precision measurement device and a measurement method for KDP or DKDP crystal body damage performance. Background technique [0002] Due to its fast growth rate (10mm / day) and the ability to grow to a larger (~40cm) geometric size, KDP or DKDP crystal is currently the only available frequency conversion material for laser inertial confinement fusion drivers. Under the action of nanosecond laser pulses below the intrinsic damage threshold, KDP or DKDP crystals often exhibit bulk damage, which usually appears in large numbers (~10 3 / mm 3 ), geometric dimensions between 10 0 ~10 1 Needle-shaped damage points on the order of μm. The appearance of body damage points will not only increase the scattering loss, but also increase the contrast of the downstream beam, thereby inducing damage to the downstream optical component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/958
CPCG01N21/958
Inventor 郑垠波巴荣声丁磊周信达李杰徐宏磊李亚军那进张霖刘勇石振东马骅刘昂徐凯源万道明白金玺
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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