  The paper examines superradiance in impurity crystals in the field of a
coherent phonon wave excited by two ultrashort laser pulses via Raman
scattering processes at the moment of preparation of the initial state of an
ensemble of emitters. It is shown that by varying the power of the excitation
pulses and their mutual direction of propagation, one can control the
superradiance parameters and extract data on the electron-phonon coupling
constant and its anisotropy.

Optics