连续偏光干涉法测量波片宽波段延迟量变化

为了测量石英波片宽光谱下相位延迟量,根据连续偏光干涉原理,提出了一种新的测量方法,并给出了相应波长的延迟量数据处理办法。采用岛津UV-3101PC分光光度计双光路比对测量方法,增加了采集数据的稳定可靠性,获得了已知厚度的石英波片300nm~800nm波段的连续偏光干涉谱,进行了理论分析和实验验证,获得了波片的宽光谱相位延迟量数据。结果表明,实验曲线和理论曲线吻合较好,测量平均误差不大于2°。这一结果对研究波片延迟量色散性质以及工艺进程的引导有重要实际意义。

Numerical simulation of waveguide opto-combiner fabricated by femtosecond laser

In order to analyze the feasibility of machining micro- or nanophotonic devices using femtosecond laser, effect of the coupling angles on the coupled beam field of cosine style of Y combiners was simulated based on the optical beam propagation equation solved by finite difference iterative, and the relationship among field intensity, coupling angle and transmission loss was analyzed. The results show that when the coupling angle is 0.6rad and the incident fields are completely isolated, the transmission loss is as low as 0.45dB, and the transmission efficiency is as high as 90%. The numerical simulation provides a basic preanalysis for fabricating opto-combiners in fused silica with high damage threshold by femtosecond laser. Furthermore, it has great significance for micromaching micro- or nanophotonic and waveguide-based devices using femtosecond laser.