Photorefractive damage to bulk crystals and channel waveguides in periodically poled lithium tantalate

William V. Davis; Mool C. Gupta

doi:10.1117/12.239686

10 May 1996 Photorefractive damage to bulk crystals and channel waveguides in periodically poled lithium tantalate

William V. Davis, Mool C. Gupta

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239686
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We present the results of an experimental study of photorefractive damage caused by laser light at a wavelength of 488 nm in z-cut lithium tantalate bulk crystals and channel waveguides. The photorefractive damage was measured using both imaging technique and interferometry. Initially, we measured the photorefractive damage in virgin-poled crystal samples of various grades purchased from several sources. As expected, the amount of photorefractive damage is least in optical-grade crystals. In addition, we compared photorefractive damage in waveguides fabricated in virgin-poled and periodically poled optical-grade z-cut crystals. Our results confirm that the amount of photorefractive damage that occurs during irradiation is less in periodically poled waveguides. Furthermore, heating the waveguide devices to a temperature of 100 degree(s)C during irradiation removes most of the visible distortions of the waveguide mode profile that result from photorefractive damage for both the virgin-poled and periodically poled waveguides.

Citation Download Citation

William V. Davis and Mool C. Gupta "Photorefractive damage to bulk crystals and channel waveguides in periodically poled lithium tantalate", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239686

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