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Cavity attenuated phase shift Faraday rotation spectroscopy
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abstract
Cavity attenuated phase shift Faraday rotation spectroscopy has been developed and demonstrated by oxygen detection near 762 nm. The system incorporates a high-finesse cavity together with phase-sensitive balanced polarimetric detection for sensitivity enhancement and achieves a minimum detectable polarization rotation angle (1{\sigma}) of $5.6\times 10^{-9}$ rad/$\surd$Hz, which corresponds to an absorption sensitivity of $4.5\times 10^{-10}$ cm$^{-1}/{\surd}$Hz without the need for high sampling rate data acquisition.
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