Abstract
We apply a newly developed 2-μm distributed Bragg reflector (DBR) laser to CO2 spectroscopy. We achieve mode-hop free wavelength tuning over 4 nm by sweeping the DBR current and phase control current, simultaneously. The sensitivity of this laser spectroscopy system is better than 5 × 10−3, which is the noise level, and means that a CO2 concentration of 400 ppm can be detected with a path length of 1 m. We confirm that the DBR laser in the 2-μm region maintains a wide tunability of 4 nm even when rapidly swept at a scan rate of 10 kHz.
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