The paper is a study into the spectroscopic and nonlinear-optical properties of semiconductor photorefractive crystals based on cadmium telluride (CdTe) doped with transition metals or irradiated by electrons and gamma-quanta. The protorefractive response is analyzed using the four-wave mixing pattern of laser pulses one of which is delayed in time. It is found that both irradiation and doping of cadmium telluride crystals with vanadium, titanium or iron leads to changes in the spectroscopic and nonlinear-optical properties of the crystals. Apart from relatively narrow (about 100 nm ) bands appearing in the absorption spectra due to additional energy levels within the band gap, one can observe variations in the absorption factor over a wide spectral region ( 1-3 μm). Recording of dynamic holograms is realized with no external electric field owing to pulsed laser radiation at a wavelength of 1.06 μm and diffraction efficiency of 1-2%. Continuous laser excitation (1.5 μm wavelength and an applied external electric field of about 2 kV /cm ) with the use of the two-wave mixing pattern has enabled energy transfer to a weak wave giving the amplification factor that comes to 1 cm^-1.

Date Published: 18 April 2006
PDF: 7 pages
Proc. SPIE 6180, Photonics, Devices, and Systems III, 61801Q (18 April 2006); doi: 10.1117/12.675823

Published in SPIE Proceedings Vol. 6180:
Photonics, Devices, and Systems III
Pavel Tománek; Miroslav Hrabovský; Miroslav Miler; Dagmar Senderákova, Editor(s)