Optical characterization of lithium tantalate channel waveguides

William V. Davis; Mool C. Gupta

doi:10.1117/12.239646

10 May 1996 Optical characterization of lithium tantalate channel waveguides

William V. Davis, Mool C. Gupta

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239646
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We present the results of a study of the optical properties of channel waveguides fabricated in z-cut lithium tantalate single crystals through proton-exchange in pyrophosphoric acid. A mask with lines 4 micrometers wide was used to fabricated these waveguides. The extraordinary effective refractive indices and near-field mode profiles of a waveguide proton-exchanged at 260 degree(s)C for 12 min and annealed at 400 degree(s)C for up to 3 h, are measured for TM polarized laser light at wavelengths 442, 543, 632, and 780 nm. The effective indices of the waveguide were measured through prism coupling. We observed that the variation of the extraordinary effective index with annealing time displays the anomalous behavior reported previously in the literature and it is maximum for an annealing time of 9 min. Using a prism coupler to individually excite each mode, we measured the near-field mode profiles by magnifying and imaging the end of the waveguide onto an optical multichannel analyzer. The variation of the FWHM in the width and depth directions as a function of wavelength and annealing time are presented. For the longest annealing time, we compare our results with the theoretical predictions obtained through numerical modeling.

Citation Download Citation

William V. Davis and Mool C. Gupta "Optical characterization of lithium tantalate channel waveguides", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239646

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