Absorption of femtosecond light pulses due to indirect interband transitions in crystals

摘要

The theory of absorption of femtosecond light pulses due to indirect interband transitions in crystals is developed. The absorption occurs due to two-quantum processes with participation of a photon and a phonon. Expressions governing J, the density of energy absorbed during the laser pulse action, and its dependence on laser pulse duration, temperature, and frequency of light are obtained.