Prediction of second harmonic generation efficiency in real periodically poled lithium niobate structures grown by the off-center Czochralski technique

Proceedings of 2005 IEEE/LEOS Workshop on Fibres and Optical Passive Components, 2005. Pub Date : 2005-06-22 DOI:10.1109/WFOPC.2005.1462111

E. Autizi, A. Capobianco, F. Pigozzo, C. Someda, N. Argiolas, M. Bazzan, E. Cattaruzza, P. Mazzoldi, C. Sada

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Abstract

The work focuses on periodically poled lithium niobate crystals grown by the off-center Czochralski technique and exhibiting an appreciable second harmonic generation efficiency. Several samples have been characterized through experimental measurements of domains periods in order to find out the real period values and drifts of the border domains positions. By means of the nonlinear bidirectional beam propagation method (NL Bi-BPM), the governing equations describing the interaction between the wave at fundamental frequency and the wave at second harmonic have been integrated and the theoretical SHG efficiency was numerically determined. In order to take into account the border domain effects, the normalized efficiency was used to rescale the calculated value furnishing the real SHG efficiency. As an interesting result an efficiency of 0.5% in forward QPM SHG has been predicted for a reference structure of 0.5 mm length.

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偏中心chzochralski技术生长的周期性极化铌酸锂结构中二次谐波产生效率的预测

这项工作的重点是周期性极化的铌酸锂晶体生长的偏离中心的Czochralski技术，并显示出可观的二次谐波产生效率。为了找出边界域位置的真实周期值和漂移，对几个样品进行了域周期的实验测量。利用非线性双向波束传播方法(NL Bi-BPM)，对描述基频波与次谐波波相互作用的控制方程进行了积分，并对理论SHG效率进行了数值计算。为了考虑边界域效应，采用归一化效率对计算值进行了缩放，得到了真实的SHG效率。一个有趣的结果是，对于长度为0.5 mm的参考结构，预测正向QPM SHG的效率为0.5%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of 2005 IEEE/LEOS Workshop on Fibres and Optical Passive Components, 2005.

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