title: Picosecond photorefractive beam coupling in GaAs.
abstract: We report the first observation to our knowledge of the photorefractive effect on picosecond time scales. Photorefractive beam coupling in GaAs with picosecond, 1.06-microm pulses is observed owing to charge separation between electrons and the ionized defect EL2(+) at low fluences and to separation between free electrons and holes created by two-photon interband absorption for high fluences. The accompanying processes of linear absorption, two-photon absorption, and transient energy transfer are also observed.
authors.forename: G C
authors.initials: GC
authors.lastname: Valley
authors.forename: A L
authors.initials: AL
authors.lastname: Smirl
authors.forename: M B
authors.initials: MB
authors.lastname: Klein
authors.forename: K
authors.initials: K
authors.lastname: Bohnert
authors.forename: T F
authors.initials: TF
authors.lastname: Boggess