Abstract
In order to avoid stimulated Brillouin scattering and smooth the final focal
spot that reaches the D-T capsule, spectral broadening is essential. However, the
modulation of spectral structure might result in frequency-to-amplitude modulation
(FM-to-AM) conversion. The spatial filter pinhole is used to cut off the
high-frequency transmission laser, and to ensure the desired pass. Improper
parameter of pinhole would lead a negative impact. Using the spatial filter pinhole,
we analyze the characteristic of intensity modulation using several pinholes of
improper parameters. We then compare these results with the intensity modulation
obtained from an experiment. Experimental diagnosis and design of an appropriate
pinhole parameter would be highly beneficial to the field of high-power lasers.
© 2012 Chinese Optics Letters
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