Share Email Print
cover

Proceedings Paper

Prejudgement of hot-images’ damage based on gradient direction matching method in high power laser system
Author(s): Aihua Yang; Dean Liu; Yaru Gao; Jie Miao; Jianqiang Zhu
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Hot-images’ formation process from damage sites to locations after nonlinear mediums is analyzed under high flux theoretically and numerically. Analysis shows that peak intensities of hot images scarcely change with damage depth whereas there can be a variation of locations which is approximately the thickness of the nonlinear medium. Considering that hot images appear periodically on alternating mediums, a gradient direction matching method with high signal-to-noise ratio is proposed to prejudge hot images, which is calculated efficiently with FFT method. It calculates damage sites’ properties inversely with the extracted diffraction intensities from the detected ring’s center. Accuracies of the inversed diffraction length and damage size are experimentally studied with the single diffraction ring. As intensity is disturbed by random noise, accuracy of damage size has an error of about tens of microns. Images are usually full of random noise. Experimental result shows that this algorithm can accurately find the diffraction center under this circumstance. Rings are generally overlapped with each other, so the resolution is studied when two rings are overlapped with different percentages. Experimental result shows that the minimum spacing between two damage sites is 1.374 mm when diffraction length is 245 mm. A method using a fan-shaped template is put forward to improve the resolution of the overlapped diffraction rings when the diffraction intensities are disturbed seriously. Results show that this algorithm can prejudge hot images quickly prior to the initiation of a full-system shot.

Paper Details

Date Published: 1 August 2017
PDF: 10 pages
Proc. SPIE 10339, Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers, 103390K (1 August 2017); doi: 10.1117/12.2272159
Show Author Affiliations
Aihua Yang, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Dean Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Yaru Gao, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Jie Miao, Shanghai Institute of Optics and Fine Mechanics (China)
Jianqiang Zhu, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 10339:
Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

© SPIE. Terms of Use
Back to Top