The photorefractive effect in lithium tantalate and irradiated lithium niobate
Spinhirne, James Michael
Estle, Thomas L.
Master of Arts
Holographic techniques were used to study the photorefractive effect in y or electron irradiated LiNb3 and in two LiTa3 crystals containing different impurity concentrations. Volume phase holograms were written in the crystals with two intersecting laser beams and were erased either thermally or optically by exposure to a single laser beam. Changes in the writing response of the crystals after optical erasure were measured. Optical absorption spectra and E.P.R. spectra were taken in an attempt to identify defects in the crystals and to measure any changes in the crystals caused by irradiation or by exposure to laser light.