Study on impact of spatial filter on a hot image through medium with gain

Zhang, Junyong; Jiao, Zhaoyang; Sun, Meizhi; Liu, Dean; Zhu, Jianqiang

doi:10.1016/j.ijleo.2015.03.014

Cited by 9 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to ensure the safe operation of the system, solutions are proposed to circumvent this threat. The spatial filter is a conventional method to suppress hot images in the main amplifier section, which is used to remove those Fourier spectrum components that would experience high gains [14, 15] . In 2017, Yang et al.…”

Section: Introductionmentioning

confidence: 99%

Direct prejudgement of hot images with detected diffraction rings in high power laser system

Yang

Zhan

Liu

et al. 2018

High Pow Laser Sci Eng

Self Cite

View full text Add to dashboard Cite

A direct prejudgement strategy that takes the diffraction ring as the analysis target is put forward to predict hot images induced by defects of tens of microns in the main amplifier section of high power laser systems. Analysis of hot-image formation process shows that the hot image can be precisely calculated with the extracted intensity oscillation of the diffraction ring on the front surface of the nonlinear plate. The gradient direction matching (GDM) method is adopted to detect diffraction rings. Recognition of simulated diffraction rings shows that it is feasible to directly prejudge hot images induced by those closely spaced defects and the defects that are far apart from each other. Image compression and cluster analysis are utilized to optimize the performance of the GDM method in recognizing actually collected diffraction images. Results show that hot images induced by defects of tens of microns can be directly prejudged without redundant information.

show abstract

Section: Introductionmentioning

confidence: 99%

Direct prejudgement of hot images with detected diffraction rings in high power laser system

Yang

Zhan

Liu

et al. 2018

High Pow Laser Sci Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7]. In MOPA-based high power lasers, spatial filter is an essential component for improving the output beam quality, which is comprised of a focusing-lens and collimating-lens pair with a pinhole placed at their common focus [8][9][10][11]. The far-field stability of the laser beam is relative to whether the pulse seed can smoothly propagate through the pinhole and it also contributes to the long-term stable operation of the laser system.…”

Section: Introductionmentioning

confidence: 99%