Two schemes for trace detection using cavity ringdown spectroscopy

• DOI: 10.1007/s00340-003-1363-8
• Publication Date: 2004-03-03T22:35:10Z
• Authors: J. Morville; D. Romanini; A.A. Kachanov; M. Chenevier
• Keywords: TRACE (psycholinguistics); Trace gas; Spectral resolution

We describe and compare two schemes of high-sensitivity cavity ringdown spectroscopy (CRDS), both functioning with telecom diode lasers. The first (cw-CRDS) gives high spectral resolution, which is useful for low-pressure trace detection or for laboratory spectroscopy applications. We present a compact prototype partly based on fiber technology. The second scheme exploits optical feedback (of-CRDS) and results in a much simpler setup, more appropriate for realizing low-cost trace-detection devices.