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PACS 78.30.Fs Constants characterising the efficiency of far-infrared (FIR) photon coupling to phonon sum and difference combination processes 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. LO phonon band population inversion relative to LA band at the same phonon momentum is revealed in electric field acting on the conduction-band electrons using Monte Carlo method. Radiative decay of acumulated LO phonons and daughter TO and LA phonons is considered.

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