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Proceedings Paper

CW-OPO-based cavity-leak-out spectrometer for ultrasensitive and selective mid infrared trace gas analysis
Author(s): Frank Kuhnemann; Frank Muller; Golo von Basum; Daniel Halmer; Alexander Popp; Stephen Schiller; Peter Hering; Manfred Muertz
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Paper Abstract

An all-solid-state infrared trace gas sensor is presented combining a continuous-wave optical parametric oscillator (OPO) with Cavity Leak-Out spectroscopy (CALOS), a cw version of Cavity Ring Down spectroscopy. The PPLN based pump resonant, singly resonant OPO is pumped at 1064 nm (2 W). Dual cavity design allows to select any desired wavelength within the emission range of the OPO (3.1 - 3.8 μm) and to use different tuning schemes in order to scan absorption features. To detect the CALOS signals the OPO frequency is scanned over the cavity resonance at kHz rates. The high power of the OPO (up to 100 mW at each end of the cavity) allows a strong excitation of the TEM00 mode of the cavity, yielding large detector signals. A noise-equivalent absorption coefficient of 1.6*10-10cm-1/√Hz is reached for integration times up to 180 sec. This corresponds to a detection limit for ethane at sub-ppt level. Measurements at reduced pressure (100 mbar) combined with a scanning of the OPO over cm-1 wide regions allows a multi-gas analysis of ambient air and human breath samples without a cooling-trap.

Paper Details

Date Published: 14 June 2004
PDF: 11 pages
Proc. SPIE 5337, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III, (14 June 2004); doi: 10.1117/12.532580
Show Author Affiliations
Frank Kuhnemann, Bonn Univ. (Germany)
Max Planck Institute of Chemical Ecology (Germany)
Frank Muller, Bonn Univ. (Germany)
Dusseldorf Univ. (Germany)
Golo von Basum, Dusseldorf University (Germany)
Daniel Halmer, Dusseldorf University (Germany)
Alexander Popp, Bonn Univ. (Germany)
Stephen Schiller, Dusseldorf University (Germany)
Peter Hering, Dusseldorf University (Germany)
Manfred Muertz, Dusseldorf University (Germany)


Published in SPIE Proceedings Vol. 5337:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III
Kenneth L. Schepler; Dennis D. Lowenthal, Editor(s)

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