铌酸锂
二次谐波产生
材料科学
光学
非线性光学
光子学
波长
去极化
薄膜
极化(电化学)
光电子学
非线性系统
物理
激光器
纳米技术
化学
医学
量子力学
内分泌学
物理化学
作者
Junjun Ma,Jiaxin Chen,Mengxin Ren,Wei Wu,Wei Cai,Jingjun Xu
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2019-12-19
卷期号:45 (1): 145-145
被引量:20
摘要
In this Letter, we present systematic studies of the second-harmonic generation (SHG) behaviors of lithium niobate (LN) thin film, including comprehensively evaluating its second-order nonlinear susceptibility elements and characterizing the SH polarization states as functions of fundamental wavelengths and polarizations. Moreover, the film shows an advantage of SH enhancement resulting from Fabry–Perot resonance compared with its bulk counterpart. We further show a type of nonlinear effect from LN film, called the nonlinear depolarization effect, in which the degree of polarization (DOP) of SH is nonlinearly dependent on the intensity of the fundamental frequency wave. Such a nonlinear effect would enable novel light sources with controllable DOP. Our results would be useful in developing compact SHG devices and the related multi-functional monolithic integrated LN photonic chips.
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