title: Chirp and self-phase modulation in induced-grating autocorrelation measurements of ultrashort pulses.
abstract: We show that induced-grating/four-wave-mixing ultrashort-pulse autocorrelation techniques that use slowly responding media offer the same phase information as interferometric second-harmonic generation. We also show that autocorrelation traces from nearly all possible induced-grating/four-wave-mixing beam geometries provide this information, with all yielding the same theoretical result, an integral of a fourth-order electric-field coherence function. Such traces clearly reveal chirp and self-phase-modulation effects without high-frequency fringes. Experiments using a two-beam-coupling arrangement in photorefractive media illustrate these effects.
authors.forename: R
authors.initials: R
authors.lastname: Trebino
authors.forename: C C
authors.initials: CC
authors.lastname: Hayden
authors.forename: A M
authors.initials: AM
authors.lastname: Johnson
authors.forename: W M
authors.initials: WM
authors.lastname: Simpson
authors.forename: A M
authors.initials: AM
authors.lastname: Levine