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-µm 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.
© 1986 Optical Society of America
George C. Valley, Arthur L. Smirl, M. B. Klein, K. Bohnert, and Thomas F. Boggess, "Picosecond photorefractive beam coupling in GaAs," Opt. Lett. 11, 647-649 (1986)