A room-temperature resonant-cavity light source emitting at is presented. It combines a CdHgTe light-emitting layer, grown by molecular beam epitaxy, and two evaporated Bragg mirrors. The emitter is optically pumped by a commercial low-power GaAs laser diode. Compared with an unprocessed sample, this microcavity device shows a drastic (10-fold) linewidth reduction, a 3.3-fold intensity increase at , and a 2.4-fold angular-spread decrease. The emitted optical power is , and the device is used as a light source in a basic gas-detection setup. Measurements of a butane–propane mixture in the 1 to bar range with a 5-cm-long single-path gas cell are demonstrated.
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