涡旋相位退化共路径干涉测量
Vortex phase deterioration common path interferometry
AI总结：
本文提出热光折射干涉测量方法，通过热透镜叠加涡旋光束与非涡旋光束，利用牛奶样品分析输出干涉图的相位退化，为研究材料介质驱动的相位变化提供新型干涉测量手段。
摘要：
共路径干涉仪（CPI）因其结构紧凑和抗振动性而具有重要意义。CPI 中通常面临的挑战源于参考光束与样品光束之间的间距非常小，其中将参考光束穿过样品被视为一种限制。但这一限制也使得探测光束与材料之间的相互作用随其相位结构变化变得困难。本研究可为一种新型干涉测量方法铺平道路，该方法能够提供独特的相位特征来研究样品。本文提出并演示了一种基于热光折射的新方法，使两束光都穿过样品，并探测由于光束在材料介质中的相对相互作用而产生的相位退化。在此，热光折射干涉测量（TORI）通过热透镜现象实现了高阶涡旋光束与非涡旋光束的叠加。非涡旋光束由另一台激光器以可控方式扩束。扩束的非涡旋光束与涡旋光束在样品内的相对相互作用产生输出干涉图。对输出干涉图的相位退化分析阐明了介质驱动的相位变化。该技术通过记录 OAM 光束的均方根方位角相位退化，使用牛奶样品进行了演示。
英文摘要：
Common path interferometers (CPI) are significant due to their compactness and vibration resistance. The usual challenge in CPI would arise due to a very small separation between reference and sample beams, where sending a reference beam through a sample is considered as a limitation. But this limitation also makes it difficult to probe the interaction of beams with material as a function of their phase structure. This study can pave the way for a new kind of interferometry that can provide unique phase signatures to study the sample. The paper proposes and demonstrates a novel approach based on thermo-optic refraction, to send both beams through the sample and probe the phase deterioration due to the relative interaction of beams in the material medium. Here, thermo-optic refraction interferometry (TORI) allows the superposition of a higher order vortex beam with a non-vortex beam through the phenomenon of thermal lensing. The non-vortex beam is made to expand in a controlled fashion by another laser. The relative interaction of the expanding non-vortex beam and the vortex beam within the sample, results in the output interferogram. The phase deterioration analysis of the output interferogram elucidate medium driven phase changes. This technique is demonstrated using the milk samples by recording the RMS azimuthal phase deterioration of the OAM beam.
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