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Spectrometer-less Raman detection using rotating, tunable band-pass filters

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Abstract

Rotation of thin-film, angle-tunable, band-pass filters was used to detect atmospheric-pressure nitrogen in a capillary-waveguide, Raman system. The sinusoidal rotation (frequency f) varies the center of the filters’ pass-band and a 2f electrical signal was detected.

© 2012 Optical Society of America

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