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Two-dimensional interferometric characterization of laser-induced refractive index profiles in bulk Topas polymer

机译:本体Topas聚合物中激光诱导的折射率分布的二维干涉表征

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In this paper we precisely determine laser-induced refractive index profiles created in cyclic olefin copolymer Topas 6017 employing a sophisticated phase shifting Mach-Zehnder interferometry approach. Beyond the usual one-dimensional modification depth measurement we highlight that for straight waveguide structures also a two-dimensional refractive index distribution can be directly obtained providing full information of a waveguide's exact cross section and its gradient refractive index contrast. Deployed as direct data input in optical waveguide simulation, the evaluated 2D refractive index profiles permit a detailed calculation of the waveguides' actual mode profiles. Furthermore, conventional one-dimensional interferometric measurements for refractive index depth profiles with varying total imposed laser fluence of a 248 nm KrF excimer laser are included to investigate the effect on refractive index modification depth. Maximum surface refractive index increase turns out to attain up to 1.86.10(-3) enabling laser-written optical waveguide channels. Additionally, a comprehensive optical material characterization in terms of dispersion, thermo-optic coefficient and absorption measurement of unmodified and UV-modified Topas 6017 is carried out. (C) 2017 Elsevier B.V. All rights reserved.
机译:在本文中,我们使用复杂的相移Mach-Zehnder干涉法精确确定了在环状烯烃共聚物Topas 6017中产生的激光诱导的折射率分布。除了通常的一维修改深度测量之外,我们强调,对于直波导结构,还可以直接获得二维折射率分布,从而提供波导精确横截面及其梯度折射率对比度的完整信息。评估后的2D折射率分布被部署为光波导模拟中的直接数据输入,可以对波导的实际模式分布进行详细计算。此外,还包括常规的一维干涉测量方法,用于测量折射率深度分布,其中改变了248 nm KrF准分子激光的总施加激光注量,以研究对折射率改变深度的影响。事实证明,最大的表面折射率增加可以达到1.86.10(-3),从而可以进行激光写入的光波导通道。此外,还对未改性和经紫外线改性的Topas 6017的色散,热光系数和吸收率测量进行了全面的光学材料表征。 (C)2017 Elsevier B.V.保留所有权利。

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