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Proceedings Paper

Research of frequency modulation to amplitude modulation with multi-frequency modulation
Author(s): Yuliang Zhou; Sui Zhan; Yuanchao Geng; Lanqin Liu; Lixin Xu; Hai Ming
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Paper Abstract

For better performance of laser coupling in inertial confinement fusion (ICF), beam shaping of the focus spot is required. Among all the beam smoothing methods, the multi frequency modulation smoothing by spectral dispersion (MultiFM-SSD) proposed by LLE has the advantages of the faster smoothing and better operability. Strong frequency modulation to amplitude modulation conversion(FM-to-AM) will take place because of the complex spectrum imposed by the multi frequency modulators applied in the Multi FM-SSD method. The FM-to-AM effect is studied with numerical simulation including the polarization mode dispersion and group velocity dispersion. The results reveal that the modulation frequencies and bandwidths of multi modulators will influence the contrast degree of the FM-to-AM effect. The compensation of the FM-to-AM with arbitrary waveform generator (AWG) is also numerically simulated. The FM-to-AM effect is effectively suppressed, i.e. the non-uniformity of the pulse decreases substantially, by applying multiple intensity and phase compensation (the compensation function is obtained via G-S algorithm).

Paper Details

Date Published: 31 December 2013
PDF: 5 pages
Proc. SPIE 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 90420H (31 December 2013); doi: 10.1117/12.2036156
Show Author Affiliations
Yuliang Zhou, Univ. of Science and Technology of China (China)
China Academy of Engineering Physics (China)
Sui Zhan, China Academy of Engineering Physics (China)
Yuanchao Geng, China Academy of Engineering Physics (China)
Lanqin Liu, China Academy of Engineering Physics (China)
Lixin Xu, Univ. of Science and Technology of China (China)
Hai Ming, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 9042:
2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Xiaocong Yuan; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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