Braun Amanda M, Slipchenko Mikhail N, Leicht Jason, Meyer Terrence R, Danehy Paul M, Roy Sukesh
Opt Lett. 2023 Aug 1;48(15):4005-4008. doi: 10.1364/OL.487369.
In the filtered Rayleigh scattering (FRS) technique, Doppler or homogeneously broadened light from weak molecular scattering is separated from orders-of-magnitude stronger elastic scattering from surfaces, windows, particles, and/or droplets using a narrowband filter. In this work, high-speed detection of such weak molecular scattering is enabled by a burst-mode laser system that can achieve a spectral purity of ∼0.999999. This allows for an additional two orders of magnitude of attenuation from a narrowband iodine molecular filter for high-speed detection of gas-phase FRS in the presence of direct surface scattering at 532 nm. The methodology, system characterization, and feasibility of single-shot gas-phase FRS at 100 kHz or higher are presented and discussed.
在滤波瑞利散射（FRS）技术中，利用窄带滤波器将来自弱分子散射的多普勒或均匀展宽光与来自表面、窗口、颗粒和/或液滴的强度强几个数量级的弹性散射分开。在这项工作中，一种脉冲模式激光系统实现了对这种微弱分子散射的高速探测，该系统的光谱纯度可达~0.999999。这使得在532nm存在直接表面散射的情况下，通过窄带碘分子滤波器进行额外两个数量级的衰减，以实现气相FRS的高速探测。本文介绍并讨论了100kHz及以上单次气相FRS的方法、系统特性和可行性。
