The probabilities of two-photon transitions between electron states of the continuous spectrum (in the valence band or the conduction band) and discrete deep-impurity states in the band-gap region have been calculated. A two-band model of a zero-radius potential is used in the calculations to describe the deep-impurity states.
© 2010 Optical Society of America
R. S. Levitskiĭ, E. Yu. Perlin, and A. A. Popov, "Multiphoton generation of electron-hole pairs in crystals with deep impurities. I. Two-photon band-impurity transition probabilities," J. Opt. Technol. 77, 593-597 (2010)