Optical Damage in LiTaO_3

概要

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Optically-induced refractive index inhomogeneities (optical damage) in LiTaO_3 are studied in terms of the variations of light extinction. A simple relation between the laser-induced natural birefringence and light extinction is presented. The effects of the melt stoichiometry, the poling procedures and the oxygen-annealing on the optical damage in LiTaO_3 are examined from the measurements of extinction ratios. Furthermore, the observation of the thermal decay of extinction ratio indicates that the thermal activation energy is 1.1〜1.3 eV based on the diffusion theory of Amodei. By an improved technique and treatments a LiTaO_3 crystal which is made resistant to optical damage by an Ar-ion laser (4880 Å) with power density as high as 14 kW/cm^2 is successfully obtained.
社団法人応用物理学会の論文
1973-12-05