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

  • Ping Li (a1), Wei Wang (a1), Jingqin Su (a1) and Xiaofeng Wei (a1)

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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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Correspondence to:  X. Wei, 919-988 mail-box, Mianyang 621900, China. Email: xfwei@caep.cn

References

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Keywords

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

  • Ping Li (a1), Wei Wang (a1), Jingqin Su (a1) and Xiaofeng Wei (a1)

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