Abstract
We present a cell for studies of light transmission through very strongly absorbing gases. It uses a fixed window and a mirror, parallel to the latter and attached to a micrometric linear motion feedthrough monitoring mirror-window distances from 0 to a couple of centimeters. This device is tested by recording gas spectra near 4.3 μm using a Fourier transform spectrometer. Their analysis shows that optical-path lengths between 20 and 2000 μm have been obtained. This now enables spectroscopic measurements of self-broadening coefficients of lines in the band, for instance, and opens perspectives for optical soundings of thin films of porous materials.
© 2014 Optical Society of America
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