Abstract
Measurements of ammonia (NH 3) and carbon dioxide (CO 2) using a Fabry–Perot strained layer quantum well laser operating at 1.94 μm have been made. Fourier-transform infrared (FTIR) measurements, in the 1.4–2.1 μm region, were also made in order to compare the strength of different absorption bands of NH 3 and CO 2. The FTIR measurements showed that the absorption line intensities for NH 3 and CO 2 in the 2 μm wavelength region were up to two orders of magnitude stronger than the line intensities in the 1.5 μm region. An NH 3 sensitivity of 3 ppm·m, at atmospheric pressure, using 1 Hz detection bandwidth, is demonstrated using wavelength modulation spectroscopy and second harmonic detection. Furthermore, the sensitivity for NH 3 was estimated at 0.03 ppm·m in the 2 μm region.
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