The photoconductivity, photoluminescence, and Raman scattering of ligh
t were studied in high resistivity, undoped, cubic ZnSe crystals with
different concentrations of accidental impurities, which were subjecte
d to nanosecond ruby laser pulses of subthreshold intensity. The stead
y-state photoconductivity increased. The spectrum of the photoconducti
vity of the samples with a low accidental impurity concentration chang
ed. Laser bombardment altered the defect structure of the surface laye
rs of crystals.