Abstract
We demonstrate a new technique to measure the temporal coherence length of mode-locked laser pulses. As suggested by Johnson et al.,1 we make each laser pulse interfere with itself in a photorefractive crystal. However, we improve on their technique by encoding different time delays across a single laser beam, so that the entire electric field autocorrelation function can be determined in essentially real time (a few milliseconds).
© 1990 Optical Society of America
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