Faculté des sciences

Photoacoustic spectroscopy with quantum cascade distributed-feedback lasers

Hofstetter, Daniel ; Beck, Mattias ; Faist, Jérôme ; Nägele, Markus ; Sigrist, Markus W.

In: Optics Letters, 2001, vol. 26, no. 12, p. 887-889

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-1at a linewidth of 0.2... Plus

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    Summary
    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-1at 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.