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Analysis on FM-to-AM conversion of SSD beam induced by etalon effect in a high-power laser system

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Abstract

FM-to-AM (frequency modulation-to-amplitude modulation) conversion caused by nonuniform spectral transmission of broadband beam is harmful to high-power laser facility. Smoothing by spectral dispersion (SSD) beam is a special broadband beam for its monochromatic feature at the given time and space on the near field. The traditional method which uses the optical spectral transfer function as filters cannot accurately describe its AM characteristics. This paper presents the theoretical analysis of the etalon effect for SSD beam. With a low-order approximation, the analytic model of the temporal shape of SSD beam is obtained for the first time, which gives the detailed AM characteristics at local and integral aspects, such as the variation of ripples width and amplitude in general situation. We also analyze the FM-to-AM conversion on the focal plane; in the focusing process, the lens simply acts as an integrator to smooth the AM of SSD beam. Because AM control is necessary for the near field to avoid optics damage and for the far field to ensure an optimal interaction of laser–target, our investigations could provide some important phenomena and rules for pulse shape control.

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DOI:10.1017/hpl.2018.74

所属栏目:Research Articles

基金项目:The reported investigations were supported by the National Natural Science Foundation of China (No. 11404306) and the Presidential Foundation of the China Academy of Engineering Physics (No. YZJJLX2016008).

收稿日期:2018-10-23

录用日期:2018-12-17

网络出版日期:2019-06-05

作者单位    点击查看

Ping Li:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Wei Wang:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Jingqin Su:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Xiaofeng Wei:Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

联系人作者:Xiaofeng Wei(xfwei@caep.cn)

备注:The reported investigations were supported by the National Natural Science Foundation of China (No. 11404306) and the Presidential Foundation of the China Academy of Engineering Physics (No. YZJJLX2016008).

引用该论文

Ping Li, Wei Wang, Jingqin Su, and Xiaofeng Wei, "Analysis on FM-to-AM conversion of SSD beam induced by etalon effect in a high-power laser system," High Power Laser Science and Engineering 7(2), e21 (2019)

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