10 May 1996 Periodic domain inversion in Z-cut LiTaO3 by electron beam scanning assisted by an internal field within the crystal
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Abstract
The coercive field for domain reversal in a 0.5 mm Z-cut LiTaO3 was measured to be 21 KV/mm. However, if the polarization of the crystal is reversed using an electric field of 21 KV/mm, the coercive field for a second reversal is found to be 11 KV/mm. This asymmetry is due to the presence of an in-built internal field of 5 KV/mm in the virgin crystal. If the electron beam writing is done on the new C-face of the polarization reversed region of the crystal, (1) no cracking was observed, (2) the writing required less charge for domain inversion because of the reduced coercive field, thereby facilitating shorter scan times. We have obtained uniform 3.6 micrometers period domain inversion grating using this technique.
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Venkatraman Gopalan, Venkatraman Gopalan, Alan C. G. Nutt, Alan C. G. Nutt, Mool C. Gupta, Mool C. Gupta, } "Periodic domain inversion in Z-cut LiTaO3 by electron beam scanning assisted by an internal field within the crystal", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); doi: 10.1117/12.239671; https://doi.org/10.1117/12.239671
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