Izdebski M, Kucharczyk W, Raab R E
Institute of Physics, Technical University of Lódź, Poland.
J Opt Soc Am A Opt Image Sci Vis. 2002 Jul;19(7):1417-21. doi: 10.1364/josaa.19.001417.
Taking KDP as an example of a uniaxial crystal, we analyze contributions to its quadratic electro-optic response with a view to explaining differences in published values of certain quadratic coefficients. In an eigenvalue theory of light propagation we show that the linear electro-optic coefficient contributes to the quadratic response, even under ideal laboratory conditions. In addition, the effect of imperfect crystal cutting and alignment is investigated by means of computer calculations based on the Jones calculus. It is found that, for relatively small inaccuracies, the calculated values of the quadratic coefficient g(xyxy) are approximately two orders of magnitude greater when measured with a static field than with a dynamic one. This finding could explain the observed spread in some results for KDP-type crystals.
以磷酸二氢钾（KDP）这种单轴晶体为例，我们分析其二次电光响应的贡献，旨在解释某些二次系数已发表值的差异。在光传播的本征值理论中，我们表明即使在理想的实验室条件下，线性电光系数也会对二次响应有贡献。此外，通过基于琼斯算法的计算机计算研究了晶体切割和取向不完善的影响。结果发现，对于相对较小的误差，当用静态场测量时，二次系数g(xyxy)的计算值比用动态场测量时大约大两个数量级。这一发现可以解释在KDP型晶体的一些结果中观察到的差异。
