Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5415379 | Journal of Molecular Spectroscopy | 2009 | 7 Pages |
Abstract
The room temperature operating GaInAsSb/AlGaAsSb based diode laser and 66 K InAsSb/InAsSbP laser diode both operating in spectral range of formaldehyde absorption 4350-4361 cmâ1 and 2821-2823 cmâ1 have been characterized and compared. Very precise arrangement of laser absorption together with high resolution Fourier transform technique was tested. The photoacoustic technique was employed to determine the detection limit of formaldehyde (less than 1 ppmV) diluted by nitrogen for the strongest absorption line of the ν3 + ν5 band in the emission region of the GaInAsSb/AlGaAsSb diode laser. The detection limit (less than 10 ppbV) of formaldehyde was achieved in the 2820 cmâ1 spectral range in case of InAsSb/InAsSbP laser (fundamental bands of ν1, ν5).
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Jaroslav Cihelka, Irena Matulková, Svatopluk CiviÅ¡,