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We use the technique of Frequency Resolved Optical Gating (FROG) [1] to measure the amplitude and phase of an ultrashort pulse.[2] Although there are several variations of the FROG technique which use different nonlinear processes, second harmonic generation (SHG) FROG is particularly well suited for measuring unamplified nJ pulses directly from a modelocked Ti:sapphire oscillator, since SHG produces a much larger signal than the higher order nonlinear processes. Experimentally, SHG FROG is similar to a second-order intensity autocorrelation, except that the second harmonic spectrum is measured as a function of time.
© 1996 Optical Society of America
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