Abstract
An extra-cavity pulse narrowing technique is demonstrated in which a frequency-swept optical pulse is compressed by the application of a spectral window. The pulses from a cw mode-locked Nd:YAG laser were passed through an optical fibre in a regime where self-phase modulation was the dominant nonlinear mechanism, and group velocity dispersion and stimulated Raman scattering were negligible. A 3-fold compression ratio was obtained, in good agreement with theoritical predictions.
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