Ren Liqing, Asher Maor, Yaffe Omer, Silberberg Yaron, Oron Dan
Opt Lett. 2019 Aug 1;44(15):3637-3640. doi: 10.1364/OL.44.003637.
Coherent anti-Stokes Raman scattering (CARS) has found wide applications in biomedical research. Compared with alternatives, single-beam CARS is especially attractive at low frequencies. Yet, currently existing schemes necessitate a relatively complicated setup to perform high-resolution spectroscopy. Here we show that the spectral sharp edge formed by an ultra-steep long-pass filter is sufficient for performing CARS spectroscopy, simplifying the system significantly. We compare the sensitivity of the presented methodology with available counterparts both theoretically and experimentally. Importantly, we show that this method, to the best of our knowledge, is the simplest and most suitable for vibrational imaging and spectroscopy in the very low-frequency regime (<200 cm).
相干反斯托克斯拉曼散射（CARS）已在生物医学研究中得到广泛应用。与其他方法相比，单光束CARS在低频时特别具有吸引力。然而，目前现有的方案需要相对复杂的设置来进行高分辨率光谱分析。在此我们表明，由超陡长波通滤光片形成的光谱锐边足以用于进行CARS光谱分析，从而显著简化了系统。我们在理论和实验上都将所提出方法的灵敏度与现有方法进行了比较。重要的是，据我们所知，该方法是最简单且最适合在极低频范围（<200 cm）内进行振动成像和光谱分析的方法。
