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19 November 2019 Suppression effect of the spectral dispersion of sinusoidal phase modulated light on formation of hot images
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Abstract
In high-power laser systems for inertial confinement fusion, hot images may be intense enough to damage expensive optical components. Basing on split-step fast-Fourier-transform algorithm, the intensity and location of hot images of a spectrally dispersed sinusoidal phase modulated laser beam is numerically investigated. It is found that, the time-average intensity of hot image firstly decreases monotonically with the modulation depth and eventually reaches a certain minimum, then increases slowly and reaches a saturated value; in addition, with the modulation frequency and the grating dispersion coefficient increasing, the time-average intensity of hot image decreases generally; while the location of hot image always does not change. Finally, the influence of the distance from the obscuration to the nonlinear optical element on the suppression effect of spectral dispersion of sinusoidal phase modulated light on formation of hot images is discussed. The result is helpful to appropriately choose parameters of the spectrally dispersed sinusoidal phase modulated light to minimize the threat of optical damage of hot image and improve the performance of high-power laser system.
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Youwen Wang, Xiaohui Ling, Yiqing Zhong, Zhiping Dai, Liezun Chen, and Shizhuan Lu "Suppression effect of the spectral dispersion of sinusoidal phase modulated light on formation of hot images", Proc. SPIE 11181, High-Power Lasers and Applications X, 111810W (19 November 2019); https://doi.org/10.1117/12.2537434
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