Recovery of second-order optical nonlinearity in annealedproton-exchanged LiNbOx |
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Authors: | Cao X Srivastava R Ramaswamy RV Natour J |
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Affiliation: | Dept. of Electr. Eng., Florida Univ., Gainesville, FL; |
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Abstract: | The second-order nonlinear coefficients measured in proton-exchanged LiNbO3 as a function of annealing time are discussed. Measurements of reflected second-harmonic power indicate that the second-order nonlinear coefficient d33 is reduced to 60% of the bulk value as a result of proton exchange in pure benzoic acid. It is also shown that annealing restores the d-coefficients to almost the original value of the virgin crystal. For example, recovery to ~90% of the bulk value was obtained for a sample with a 0.3-μm-bulk proton-exchanged layer, annealed for 10 h at 350°C |
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