Abstract
We use a transient-grating (TG) process in a Kerr bulk medium to clean a
femtosecond laser pulse. Using the technique, the temporal contrast of the generated
TG signal is improved by more than two orders of magnitude in comparison with the
incident pulse in a 0.5-mm-thick fused silica plate. The laser spectrum is smoothed
and broadened, and the pulse duration is shortened simultaneously. We expect to
extend this technique to a clean pulse with broadband spectral bandwidth at a wide
spectral range because it is a phase-matched process.
© 2011 Chinese Optics Letters
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