Kumar Pradeep, Maydykovskiy A I, Levy Miguel, Dubrovin N V, Aktsipetrov O A
Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA.
Opt Express. 2010 Jan 18;18(2):1076-84. doi: 10.1364/OE.18.001076.
The present article highlights the lattice-imperfection and compositional origins of the nonlinear optical response in bismuth-substituted iron garnet films. In particular the roles of lattice mismatch strain and micro-strain on second harmonic generation in (Bi,Y)(3)(Fe,Ga)(5)O(12) films are elucidated based on experimental findings. It is found that lattice mismatch strain drives the second harmonic signal in (Bi,Y)(3)(Fe,Ga)(5)O(12) films, in agreement with theoretical predictions; however micro-strain was found not to correlate significantly with the second harmonic signal at the micro-strain levels present in these samples. The present study also elaborates on the influence of the film's constitutive elements and finds the nonlinear response to increase with yttrium concentration.
本文重点介绍了铋取代铁石榴石薄膜中非线性光学响应的晶格缺陷和成分起源。特别是基于实验结果阐明了晶格失配应变和微应变对（Bi，Y）（3）（Fe，Ga）（5）O（12）薄膜二次谐波产生的作用。研究发现，晶格失配应变驱动（Bi，Y）（3）（Fe，Ga）（5）O（12）薄膜中的二次谐波信号，这与理论预测一致；然而，在这些样品中存在的微应变水平下，发现微应变与二次谐波信号没有显著相关性。本研究还阐述了薄膜组成元素的影响，并发现非线性响应随钇浓度的增加而增强。
