Design and experiment of re-injection off-axis integrated cavity output spectroscopy technology in 2 μm band
نویسندگان
چکیده
منابع مشابه
Sensitivity enhancement in off-axis integrated cavity output spectroscopy.
We report on a detailed model of an improved three mirror off-axis integrated cavity output spectroscopy (OA-ICOS) setup, which re-injects the light reflected by the optical cavity. The model simulates the impact of design parameters on instrument sensitivity and can be used for any off-axis configuration. We demonstrate the application of this model for the real-time detection of ethylene with...
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Off-axis integrated cavity output spectroscopy (OA-ICOS) has generated much interest because it potentially allows highly sensitive field measurements with robust optical alignment. We discuss here design choices involved in design of an OA-ICOS instrument and how these choices impact instrument sensitivity, using as our example the design of the Harvard ICOS isotope instrument, which demonstra...
متن کاملOptimum signal-to-noise ratio in off-axis integrated cavity output spectroscopy.
The signal-to-noise ratio (SNR) in off-axis integrated cavity output spectroscopy (OA-ICOS) is investigated and compared to direct absorption spectroscopy using multipass absorption cells [tunable diode laser absorption spectroscopy (TDLAS)]. Applying measured noise characteristics of a near-IR tunable diode laser and detector, it is shown that the optimum SNR is not generally reached at the hi...
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A continuous-wave, mid-infrared, distributed feedback , interband cascade laser was used to detect and quantify formaldehyde (H 2 CO) using off-axis, integrated cavity output spectroscopy in gas mixtures containing ≈ 1–25 parts in 10 6 by volume (ppmV) of H 2 CO. Analysis of the spectral measurements indicates that a H 2 CO concentration of 150 parts in 10 9 by volume (ppbV) would produce a spe...
متن کاملOptical parametric oscillator based off-axis integrated cavity output spectroscopy for rapid chemical sensing.
An optical parametric oscillator (OPO), pumped by a fiber-amplified diode laser, is combined with off-axis integrated cavity output spectroscopy (OA-ICOS). The cw OPO (power 1.2 W, tunability 3-4 μm, 5 cm(-1) mode-hop-free tuning) has a tuning speed of 100 THz/s, which is ideal for rapid and sensitive trace gas detection. Combined with OA-ICOS, a detection limit of 50 parts per trillion by volu...
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ژورنال
عنوان ژورنال: Acta Physica Sinica
سال: 2019
ISSN: 1000-3290
DOI: 10.7498/aps.68.20190061