Abstract
A new type of semiconductor laser based on an InAsSb/InAsSbP double heterostructure and having just a single tuned spectral line is described for spectroscopy of atmospherically important molecules in the 3100 cm−1 region. The lasers are tested using a closed-cycle He-cryostat in the temperature range 12–100 K. The optimal characteristics of the lasers are found to be a temperature range of 17–80 K and a drive current range of 50–400 mA. Under these conditions, the laser emission can be tuned in a single-mode regime over a range greater than 10 cm−1. Experiments are performed to measure the rovibrational absorption spectra of CH3Cl, NH3 , OCS and H2O, which prove the generation to be the single-mode one. The estimated spectral emission line-widths vary from 7 to 30 MHz depending on current and from laser to laser.
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