Abstract
The mechanism of optical damage has been studied in LiNbO3 single crystals. The excitation and migration processes have been investigated from photocurrent, and the trapping process from thermally stimulated luminescence. The correlation between the susceptibility to optical damage and the photoconductivity of the crystal, and the effect of an applied field on optical damage are discussed. The magnitude of the photocurrent is found to be proportional to the refractive index change. It also turns out that optical damage in reduced LiNbO3 can be easily controlled by applying an external field. A broad peak of thermally stimulated luminescence is observed at about 145°C for Rh-doped LiNbO3. From this result the trap level is estimated to be ∼1.1 eV below the conduction band.
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