N. Stelmakh et al., Intensity-invariant subpicosecond absorption saturation in heavy-ion irradiated bulk GaAs, APPL PHYS L, 73(25), 1998, pp. 3715-3717
We demonstrate that bulk GaAs irradiated by heavy Au+ ions shows efficient
saturable absorption with subpicosecond recovery time and without any relax
ation rate saturation up to excitation densities as high as 1.6 mJ/cm(2). A
comparison with other types of ion irradiation shows that heavy-ion-irradi
ated GaAs is a very promising material for ultrafast optoelectronics and op
tical processing at high repetition rates. (C) 1998 American Institute of P
hysics. [S0003-6951(98)00851-1].