Stimulated two-quantum photon–phonon transitions in indirect-gap semiconductors

An analysis is made of two-quantum photon–phonon transitions in indirect semiconductors in which either the optical or the acoustic components of the transition, or both may be stimulated simultaneously. A study is reported of possible generation of coherent transverse acoustic phonons in the 10¹²–10¹³ Hz frequency range by indirect photon–phonon interband transitions.