为了实现对Si、Ge、GaAs等红外材料应力缺陷检测，采用两个工作在不同频率的光弹性调制器级联，构成偏振测量系统。应力缺陷引入的双折射延迟量和快轴方位角两个参数，被加载到偏振测量系统调制信号中；利用数字锁相技术同时获取调制信号的基频项和差频项幅值，然后完成两个应力参数求解。详细分析了检测原理，并搭建了实验系统进行验证。实验结果表明，该检测方法及实验系统实现了应力方向角标准偏差为0.31°，应力双折射延迟量标准偏差为0.72 nm，高速、高精度和高重复度的应力缺陷检测，并且实现了Ge样品的应力缺陷方向和值大小分布测量，可为红外材料质量测试分析和评估提供有效手段。

为了实现对波片快轴方位角和延迟量参数快速、高精度测试，提出了一种基于双弹光级联差频调制的波片参数测量方案。选用两个工作频率不相同的弹光调制器级联，构成偏振分析测量装置。波片的两个参数被加载到偏振分析装置的调制信号中，采用数字锁相技术同时提取调制信号的基频项和差频项，然后完成波片全部参数求解。按照原理分析，搭建了实验系统，并完成了系统初始偏移值定标，完成了632.8 nm的1/4波片，532 nm的1/4波片和1/2波片实验测量。实验结果表明，本文方案的快轴方位角测量最大偏差为0.2°，角度测量标准偏差为0.02°；波片的相位延迟量标准偏差优于5.64×10^-4 rad，单点数据测量时间仅为200 ms。考虑到波片材料的双折射色散，根据检测激光波长下测量的相位延迟量，进一步计算出应用波长的波片延迟量。测量值与理论值最大偏差不超过1.17 nm，延迟精度优于λ/300。本文方案实现了高速、高精度和高灵敏的波片参数测量，可为波片加工测试和实验定标提供有效手段。

A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics. The customized design of the resonance curve aiming at specific detection requirements can be achieved. According to the model, a probe-type nano-modified fiber optic configurable plasmonic resonance (NMF-CPR) sensor with tip hot spot enhancement is demonstrated for the measurement of the refractive index in the range of 1.3332–1.3432 corresponding to the low-concentration biomarker solution. The new-type sensing structure avoids excessive broadening and redshift of the resonance dip, which provides more possibilities for the surface modification of other functional nanomaterials. The tip hot spots in nanogaps between the Au layer and Au nanostars (AuNSs), the tip electric field enhancement of AuNSs, and the high carrier mobility of the WSe₂ layer synergistically and significantly enhance the sensitivity of the sensor. Experimental results show that the sensitivity and the figure of merit of the tip hot spot enhanced fiber NMF-CPR sensor can achieve up to 2995.70 nm/RIU and 25.04 RIU⁻¹, respectively, which are 1.68 times and 1.29 times higher than those of the conventional fiber plasmonic resonance sensor. The results achieve good agreements with numerical simulations, demonstrate a better level compared to similar reported studies, and verify the correctness of the dispersion model. The detection resolution of the sensor reaches up to 2.00×10⁻⁵ RIU, which is obviously higher than that of the conventional side-polished fiber plasmonic resonance sensor. This indicates a high detection accuracy of the sensor. The dense Au layer effectively prevents the intermediate nanomaterials from shedding and chemical degradation, which enables the sensor with high stability. Furthermore, the terminal reflective sensing structure can be used as a practical probe and can allow a more convenient operation.

垂直扫描白光干涉法（VSWLI）是一种非接触式三维表面轮廓测量方法。蝙蝠翼作为VSWLI当中一种固有的缺陷，尤其在被测样品的台阶高度小于光源的相干长度时，台阶边缘处的蝙蝠翼尤为显著。相移干涉法不存在这种缺陷，但是存在相位模糊的问题。提出一种将Carré等步长相移算法与快速傅里叶变换（FFT）相干峰值检测技术相结合的白光干涉解调算法。该算法基于逐次变分模态分解（SVMD）与Hausdorff 距离（HD）联合去噪。分别以高度为500 nm和1 200 nm的连续台阶器件和高度为10 μm的标准台阶作为测试样品，进行实验测量验证。所提出的算法能够有效地抑制台阶高度跳变处的蝙蝠翼，克服相位模糊问题。