Title :
Theory of transient energy transfer in gallium arsenide
Author :
Valley, George C. ; Smirl, Arthur L.
Author_Institution :
Hughes Res. Lab., Malibu, CA, USA
Abstract :
Numerical calculations are given for optical two-beam coupling in undoped, semi-insulating GaAs using picosecond pulses. Absorption at the intrinsic defect EL2, two-photon absorption, free-carrier absorption, photorefractive gratings, free-carrier gratings, and absorption gratings are included. Results for normalized probe transmission as a function of pump fluence and as a function of pump-probe delay show that the major effects are energy transfer from pump to probe or from probe to pump (depending on crystal orientation) due to the photorefractive effect, two-photon absorption, and free-carrier transient energy transfer from the pump to the probe.<>
Keywords :
III-V semiconductors; diffraction gratings; gallium arsenide; nonlinear optics; photorefractive effect; two-photon spectra; GaAs; III-V semiconductor; absorption; absorption gratings; crystal orientation; free-carrier absorption; free-carrier gratings; intrinsic defect EL2; normalized probe transmission; numerical calculations; optical two-beam coupling; photorefractive gratings; pump fluence; pump-probe delay; transient energy transfer; two-photon absorption; undoped semiinsulating GaAs; Absorption; Delay effects; Energy exchange; Gallium arsenide; Gratings; Optical coupling; Optical pulses; Optical pumping; Photorefractive effect; Probes;
Journal_Title :
Quantum Electronics, IEEE Journal of
