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- W2004576595 abstract "Cavity-enhanced resonant photoacoustic spectroscopy with optical feedback cw diode lasers (OF-CERPAS) is introduced as a novel technique for ultratrace gas analysis and high-resolution spectroscopy. In the scheme, a single-mode cw diode laser (3 mW, 635 nm) is coupled into a high-finesse linear cavity and stabilized to the cavity by optical feedback. Inside the cavity, a build-up of laser power to at least 2.5 W occurs. Absorbing gas phase species inside the cavity are detected with high sensitivity by the photoacoustic effect using a microphone embedded in the cavity. To increase sensitivity further, coupling into the cavity is modulated at a frequency corresponding to a longitudinal resonance of an organ pipe acoustic resonator (f=1.35 kHz and Q≈10). The technique has been characterized by measuring very weak water overtone transitions near 635 nm. Normalized noise-equivalent absorption coefficients are determined as α≈4.4×10−9 cm−1 s1/2 (1 s integration time) and 2.6×10−11 cm−1 s1/2 W (1 s integration time and 1 W laser power). These sensitivities compare favorably with existing state-of-the-art techniques. As an advantage, OF-CERPAS is a “zero-background” method which increases selectivity and sensitivity, and its sensitivity scales with laser power." @default.
- W2004576595 created "2016-06-24" @default.
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- W2004576595 date "2010-07-28" @default.
- W2004576595 modified "2023-10-18" @default.
- W2004576595 title "Cavity-enhanced resonant photoacoustic spectroscopy with optical feedback cw diode lasers: A novel technique for ultratrace gas analysis and high-resolution spectroscopy" @default.
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- W2004576595 doi "https://doi.org/10.1063/1.3461061" @default.
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