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 1   µJ 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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