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).
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