Constants characterising the efficiency of far-infrared (FIR) photon coupling to anharmonic lattice vibrations are elucidated from existing experimental data in CdTe and ZnTe crystals. Two-phonon difference processes are concluded to play leading role in the FIR absorption in the range of 1-4 THz. Absorption modulation in electric field acting on the conduction-band electrons is considered using original Monte Carlo modeling data. If the lattice is cooled down well below the liquid nitrogen temperature the absorption is predicted to change its sign (i.e., convert to stimulated emission) under condition of inverted phonon band filling produced by electrons accelerated in electric field.

The work is partially supported by the Lithuanian State Science and Studies Foundation project V-06085

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