We demonstrate what is to our knowledge the first frequency-resolved optical gating (FROG) technique to measure ultrashort pulses from an unamplified Ti:sapphire laser oscillator without direction-of-time ambiguity. This technique utilizes surface third-harmonic generation as the nonlinear-optical effect and, surprisingly, is the most sensitive third-order FROG geometry yet.
© 1996 Optical Society of America
Thomas Tsang, Marco A. Krumbügel, Kenneth W. DeLong, David N. Fittinghoff, and Rick Trebino, "Frequency-resolved optical-gating measurements of ultrashort pulses using surface third-harmonic generation," Opt. Lett. 21, 1381-1383 (1996)