A multiple-pass cell for mid-IR spectrometry that has been designed to operate in an evacuable environmental chamber is described. Using this new modified White arrangement, we can significantly increase the path length while keeping the spectrometric beam stable. An approximate expression that ties the number of reflections to the optimal signal-to-noise ratio in multiple-reflection cells is derived.
© 1999 Optical Society of America
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(230.1150) Optical devices : All-optical devices
(230.3120) Optical devices : Integrated optics devices
(230.4040) Optical devices : Mirrors
Jean-Fraņois Doussin, Ritz Dominique, and Carlier Patrick, "Multiple-Pass Cell for Very-Long-Path Infrared Spectrometry," Appl. Opt. 38, 4145-4150 (1999)