Valley G C, Smirl A L, Klein M B, Bohnert K, Boggess T F
Opt Lett. 1986 Oct 1;11(10):647-9. doi: 10.1364/ol.11.000647.
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.
据我们所知，我们首次观测到了皮秒时间尺度上的光折变效应。在低通量下，由于电子与电离缺陷EL2(+)之间的电荷分离，以及高通量下双光子带间吸收产生的自由电子与空穴之间的分离，观测到了用皮秒、1.06微米脉冲在砷化镓中的光折变光束耦合。还观测到了线性吸收、双光子吸收和瞬态能量转移等伴随过程。
