Abstract

We introduce a transient-grating beam geometry for frequency-resolved optical-gating measurements of ultrashort laser pulses and show that it offers significant advantages over currently used geometries. Background free and phase matched over a long interaction length, it is the most sensitive third-order pulse-measurement geometry. In addition, for pulses greater than 300 fs in length and 1µJ in energy, the nonlinear medium can be removed and the nonlinearity of air can be used to measure the pulse.

© 1997 Optical Society of America

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