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Proceedings Paper

Characteristics of nonlinear imaging of broadband laser stacked by chirped pulses
Author(s): Youwen Wang; Kaiming You; Liezun Chen; Shizhuan Lu; Zhiping Dai; Xiaohui Ling
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Paper Abstract

Nanosecond-level pulses of specific shape is usually generated by stacking chirped pulses for high-power inertial confinement fusion driver, in which nonlinear imaging of scatterers may damage precious optical elements. We present a numerical study of the characteristics of nonlinear imaging of scatterers in broadband laser stacked by chirped pulses to disclose the dependence of location and intensity of images on the parameters of the stacked pulse. It is shown that, for sub-nanosecond long sub-pulses with chirp or transform-limited sub-pulses, the time-mean intensity and location of images through normally dispersive and anomalously dispersive self-focusing medium slab are almost identical; While for picosecond-level short sub-pulses with chirp, the time-mean intensity of images for weak normal dispersion is slightly higher than that for weak anomalous dispersion through a thin nonlinear slab; the result is opposite to that for strong dispersion in a thick nonlinear slab; Furthermore, for given time delay between neighboring sub-pulses, the time-mean intensity of images varies periodically with chirp of the sub-pulse increasing; for a given pulse width of sub-pulse, the time-mean intensity of images decreases with the time delay between neighboring sub-pulses increasing; additionally, there is a little difference in the time-mean intensity of images of the laser stacked by different numbers of sub-pulses. Finally, the obtained results are also given physical explanations.

Paper Details

Date Published: 18 November 2014
PDF: 11 pages
Proc. SPIE 9266, High-Power Lasers and Applications VII, 92661O (18 November 2014); doi: 10.1117/12.2073359
Show Author Affiliations
Youwen Wang, Hengyang Normal Univ. (China)
Kaiming You, Hengyang Normal Univ. (China)
Liezun Chen, Hengyang Normal Univ. (China)
Shizhuan Lu, Hengyang Normal Univ. (China)
Zhiping Dai, Hengyang Normal Univ. (China)
Xiaohui Ling, Hengyang Normal Univ. (China)


Published in SPIE Proceedings Vol. 9266:
High-Power Lasers and Applications VII
Ruxin Li; Upendra N. Singh; Robert F. Walter, Editor(s)

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