A purely electronic model of photoinduced optical anisotropy in glassy semi
conductors is formulated. The model is based on the concept of geminate ele
ctron-hole pairs captured by correlated deep traps. The kinetics of photoin
duced anisotropy are controlled by the photogeneration, trapping and recomb
ination of geminate pairs. Predictions of the model are shown to be in agre
ement with experimentally observed basic characteristic features of photoin
duced anisotropy.