Abstract

A Faraday anomalous dispersion optical filter (FADOF) and an atomic resonant absorption filter are used in tandem to demonstrate a low-frequency shift Raman measurement down to few ${\mathrm{cm}}^{-1}$. The FADOF, with an ultralow bandwidth of $0.08{\mathrm{cm}}^{-1}$ at 780 nm, serves as a bandpass filter, while the rubidium atomic cell acts as a notch filter which has a bandwidth of $0.3{\mathrm{cm}}^{-1}$. A proof-of-concept study to measure a Raman signal generated from a silica optical fiber is performed, demonstrating a low-frequency measurement of both the Stokes and the anti-Stokes shift down to $3{\mathrm{cm}}^{-1}$ at an equivalent signal level. These results indicate the prospect for gigahertz–terahertz low-energy Raman spectroscopy based on atomic filters.

© 2016 Optical Society of America

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