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2 November 2016 Low wavenumber Raman spectroscopy using atomic filters (Conference Presentation)
Xiaobo Xue, Corey Janisch, Yizhu Chen, Zhiwen Liu, Jingbiao Chen
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Proceedings Volume 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV; 99560C (2016) https://doi.org/10.1117/12.2238338
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States
Abstract
Low-wavenumber Raman spectroscopy has long been demonstrated as a method of optical characterization in a variety of applications, such as thermal detection and semiconductor analysis. However, accessing low-wavenumber Raman shifts remains a challenge, usually requiring an expensive and complex multi-stage spectrographic system to measure several cm-1 Raman shifts. In this work, we demonstrate a method to measure low-wavenumber Raman shifts down to 1 cm-1 using atomic filters. By using a narrow-band Faraday anomalous dispersion optical filter to remove spontaneous emission noise from the laser cavity and a heated atomic cell as a notch filter to remove the excitation laser, the system is able to measure low Raman shifts (down to 1 cm-1). To demonstrate the capabilities, we measure the broadband Raman spectrum from a silica optical fiber with approximately 0.3 cm-1 resolution, detecting both Stokes and Anti-Stokes Raman shift as low as 0.7 cm-1.
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Xiaobo Xue, Corey Janisch, Yizhu Chen, Zhiwen Liu, and Jingbiao Chen "Low wavenumber Raman spectroscopy using atomic filters (Conference Presentation)", Proc. SPIE 9956, Ultrafast Nonlinear Imaging and Spectroscopy IV, 99560C (2 November 2016); https://doi.org/10.1117/12.2238338
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KEYWORDS
Raman spectroscopy
Optical filters
Imaging spectroscopy
Complex systems
Laser resonators
Laser systems engineering
Linear filtering
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