ABSTRACTOptical second harmonic generation in epitaxial layers of
CdxZn1−xS and CdxZn1−xS:ZnS
and CdS:CdxZn1−xS strained layer superlattices which
had been removed from their substrates has been investigated. Some evidence
for resonant enhancement of the second order non-linear susceptibility has
been found for one sample where the onset of optical absorption was at
photon energies close to that of the second harmonic radiation.