Three-dimensional measurement method for high-power laser body damage of KDP (Potassium Dihydrogen Phosphate) crystal

A technology of three-dimensional measurement and optical damage, which is applied in the direction of optical testing for defects/defects, can solve the problem of linking the microscopic mechanism of optical damage that is difficult to achieve, and achieve the effect of increasing the threshold of optical damage

Inactive Publication Date: 2012-07-25
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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However, the literature reported by the LLNL laboratory itself has always stated that due to the macroscopic statistical properties of this detection scheme, it is difficult to link the detected experimental results with the microscopic mechanism of photodamage

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  • Three-dimensional measurement method for high-power laser body damage of KDP (Potassium Dihydrogen Phosphate) crystal
  • Three-dimensional measurement method for high-power laser body damage of KDP (Potassium Dihydrogen Phosphate) crystal
  • Three-dimensional measurement method for high-power laser body damage of KDP (Potassium Dihydrogen Phosphate) crystal

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[0030] The method for three-dimensional measurement of KDP crystal high-power laser body damage of the present invention will be further specifically described below in conjunction with the embodiments and accompanying drawings.

[0031] The KDP crystal high-power laser body damage three-dimensional measurement method of the present invention, the method of the present invention is described below with mathematical language:

[0032] (1) Define two coordinate systems on the section of the object, such as figure 1 As shown, namely:

[0033] ①Fixed coordinate system, namely x 1 and y 1 The axis is relatively fixed to the object;

[0034] ②The projected coordinate system, that is, the x and y axes, the y direction is along the projection direction (the incident direction of the laser ray), and the x 1 The axis is rotated by θ angle relative to the x axis, which is called the projected (space) coordinate system;

[0035] (2) Place the KDP crystal 3 to be measured in an interf...

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Abstract

The invention relates to a three-dimensional measurement method for high-power laser body damage of a KDP (Potassium Dihydrogen Phosphate) crystal. The method substantially comprises the following steps of placing the KDP crystal to be measured into a detection optical path of a digital hologram interferometric device, and detecting a phase distribution outline of body damage in the crystal, i.e.a two-dimensional phase distribution image; carrying out angle scanning on the crystal to be measured, carrying out Fourier transform on the two-dimensional phase distribution image obtained from each angle sampling point, and constructing a three-dimensional phase distribution appearance of the body damage through the Fourier transform. The three-dimensional fine structure of the body damage canbe utilized as an important parameter for qualitatively describing laser damage characteristics, and become a key environment correlated with laser damage macroscopic characteristics and micromechanisms and has important application to exploration of a KDP / DKDP (Deuterated Potassium Dihydrogen Phosphate) crystal laser damage mechanism and improvement of a laser damage threshold.

Description

technical field [0001] The invention relates to a KDP / DKDP crystal, which is a three-dimensional measurement method for high-power laser body damage of the KDP / DKDP crystal. Background technique [0002] In the laser inertial confinement nuclear fusion large-scale engineering device, large-scale potassium dihydrogen phosphate (Potassium Dihydrogen Phosphate, hereinafter referred to as KDP) crystals and Deuterated Potassium Dihydrogen Phosphate (abbreviated as DKDP) crystals are currently internationally recognized as Pockels The only effective high-power crystal material for Stein cell and frequency doubling conversion. At present, the laser damage threshold of KDP / DKDP crystals is far lower than the theoretical laser damage threshold calculated by the valence bond structure theory, which seriously limits the energy flux density of laser output and the service life of crystals. Therefore, the laser damage threshold of KDP / DKDP crystals has become a constraint The bottleneck...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
Inventor 孙平平刘德安张艳丽张燕刘芳张雪洁
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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