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Optically induced birefringence change (``optical damage'') has been studied in undoped LiNbO3 from 400 to 800 nm by using an incoherent light source. Optical damage was observed over the entire wavelength range, with damage peaking near 415 nm. Structure, which could not be observed by normal optical absorption measurements, was seen in at least three regions of the damage-wavelength curve.
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Serreze et al. (1973) studied this question.
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