A 2D μ-Raman analysis of low repetition rate femto-waveguides in lithium niobate by using a finite element model

被引：8
|
作者：
Tejerina, M. R. [1 ]
Jaque, D. [2 ]
Torchia, G. A. [1 ]
机构：
[1] CONICET La Plata CIC, Ctr Invest Opt, RA-1897 Pcia Buenos Aires, Argentina
[2] Univ Autonoma Madrid, Fac Ciencias C4, Dept Fis Mat, E-28049 Madrid, Spain
来源：
OPTICAL MATERIALS | 2014年 / 36卷 / 05期
关键词：
Lithium niobate; Femtosecond laser written optical; waveguides; Raman shift mapping; Refractive index field; Residual strain field; LASER; STRAIN;
D O I：
10.1016/j.optmat.2013.12.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a mu-Raman two-dimensional analysis of 1 kHz femtosecond laser written waveguides in an x-cut lithium niobate crystal. At first, the fitting between a two-dimensional elastic model and experimental micro Raman spectroscopy data (MR) were examined to validate the numerical model. In this, the Raman Potential Deformation Theory (RPDT) was employed to fit the wavenumber shift of the A(1)(TO)(4) phonon. Then, the adequate values for geometrical parameters of the numerical model (horizontal and vertical ellipse radius) were estimated. Finally, using these parameter values, the guided modes were computed for different ellipse expansions and compared with experimental guided modes. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：936 / 940
页数：5
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