Single-mode InAsSb/InAsSbP laser (λ≈3.2 μm) Tunable over 100 Å

A report is presented on the development of a single-mode laser based on the InAsSb/InAsSbP double heterostructure and operating at wavelengths of 3.2–3.3 µm in a temperature range of 12–90 K. The single-mode regime is assumed to be realized due to a smooth optical waveguide formed across the laser cavity in which the radiation flux oscillates and maintains its oscillations and intensity. An analysis is made of the effect of the current-induced shifts of the lasing frequency and the peak of the gain spectrum on the probability of single-mode lasing. Experiments were made on the scanning of OCS, NH3, CH3Cl, and H2O gas media with radiation of the given laser in the frequency range with a record width of 10 cm−1 (104 Å).