  A complex studies of optoelectronics, non-linear optical and laser stimulated
piezoelectric features of chalcogenide powder-like chalcogenide crystals pure
and rare earth doped AgGaGe3 Se8 crystallites are presented. It is shown
principal role of the morphology for the titled materials. The contribution to
nonlinear optical, photoconductivity and laser stimulated piezoelectricity are
comparable. The temperature dependences are explored. The possibilityity to
operate by the features of the titled crystallites in the optically reflected
regime is shown. This may be important for laser operated triggers, modulators,
photo detectors etc. The relaxation processes are studied. Among the NLO
features main attention is devoted to second harmonic generation efficiencies
in the reflected regime where principal role is played by morphology.
Additionally the laser stimulated piezoelectric for the near the surface states
with different morphology of grains is explored. It is demonstrated that
contribution of the near-the surface states for such kind of effects will be
commensurable to the bulk-like contribution.
