The charge transfer processes in photorefractive CdTe:Ge were modeled using
the data of optical absorption, magnetic circular dichroism (MCD) and elec
tron paramagnetic resonance (EPR) spectroscopies. Within the developed mode
l the variations in the photorefractive properties of different CdTe:Ge sam
ples are explained by differences in the relative concentrations of donor a
nd trap centers. The existence of two different centers of comparable conce
ntrations, each in two charge states, allows charge redistribution between
them and gives rise to optical sensitization of some CdTe:Ge samples for ph
otorefractive recording under an auxiliary illumination. In the present art
icle we follow the proposal of pseudo-3D presentation of light-induced abso
rption to distinguish the main charge transfer processes at different excit
ation energies and explain the sensitization of CdTe:Ge for photorefractive
recording at 1.06, 1.32 and 1.55 mum by light with appropriate wavelength.
(C) 2001 Elsevier Science B.V. All rights reserved.