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Proceedings Paper

Evolution of low-frequency noise passing through spatial filter in high power laser system
Author(s): Pingping Sun; Dean Liu; Yanli Zhang; Xiaoyan Li; Yan Zhang; Jianqiang Zhu
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Paper Abstract

In high power laser systems, the high-frequency noise generated by nonlinear effect is effectively removed by low-pass spatial filter, and the low-frequency noise passing through pinhole is always considered as very safe to optical devices in downstream. However, in practical applications both modulation contrast ratio and spatial frequency of the low-frequency noise will be changed and possibly become dangerous components, depending on different magnification ratios of spatial filter. In this paper, the evolution of low-frequency noise is theoretically analyzed and numerical simulated depending on different magnification ratios of spatial filter. The analysis results show that both modulation contrast ratio and spatial frequency of the low-frequency noise passing through pinhole will be changed 1/M times, where M is magnification ratio of spatial filter. For M<1, the safe low-frequency noise will be extruded into high-frequency which is the fastest growing components and finally develop into the most dangerous part to the damage of optical devices again. It is significant to consider the evolution of low-frequency noise in practical applications of spatial filter for high power laser system.

Paper Details

Date Published: 23 August 2010
PDF: 10 pages
Proc. SPIE 7789, Laser Beam Shaping XI, 778910 (23 August 2010); doi: 10.1117/12.860531
Show Author Affiliations
Pingping Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Dean Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Yanli Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaoyan Li, Shanghai Institute of Optics and Fine Mechanics (China)
Yan Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Jianqiang Zhu, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 7789:
Laser Beam Shaping XI
Andrew Forbes; Todd E. Lizotte, Editor(s)

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