Journal
OPTICS LETTERS
Volume 26, Issue 12, Pages 887-889Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.26.000887
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We present photoacoustic (PA) spectroscopy measurements of carbon dioxide, methanol, and ammonia. The light source for the excitation was a single-mode quantum cascade distributed-feedback laser, which was operated in pulsed mode at moderate duty cycle and slightly below room temperature. Temperature tuning resulted in a typical wavelength range of 3 cm(-1) at a linewidth of 0.2 cm(-1). The setup was based on a Herriott multipass arrangement around the PA cell; the cell was equipped with a radial 16-microphone array to increase sensitivity. Despite the relatively small average laser power, the ammonia detection limit was 300 parts in 10(9) by volume. (C) 2001 Optical Society of America.
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