Internal field in lithium tantalate single crystals

Venkatraman Gopalan; Mool C. Gupta

doi:10.1117/12.239659

10 May 1996 Internal field in lithium tantalate single crystals

Venkatraman Gopalan, Mool C. Gupta

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239659
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

An in-built internal field of 5 KV/mm was measured in Z-cut LiTaO₃ single crystals in the direction of the original polarization. This was reflected in the asymmetry (along the field axis) in the polarization hysteresis curve as a function of external electric field. Measurement of internal field as a function of crystal thickness revealed that the internal field is a volume effect. Using infrared absorption measurements, the spectrum of the hydroxl ions (OH^-) present in these crystals was measured at room temperature. The shape of the spectrum changes with polarization reversal in these crystals indicating a strong correlation with the direction of internal field with respect to the polarization direction. It suggests that the origin of internal field lies in point defect complexes involving OH^- ions.

Citation Download Citation

Venkatraman Gopalan and Mool C. Gupta "Internal field in lithium tantalate single crystals", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239659

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