Abstract
The results of studying the temperature characteristics of arched quantum-cascade lasers of 7-8 μm spectral range with different geometric sizes are presented. Laser heterostructure was grown by molecular beam epitaxy. The active region consisted of 50 cascades based on heteropairs of solid alloys In0.53Ga0.47As/Al0.48In0.52As. Single-mode lasing was demonstrated for lasers with a half-ring diameter of 100 μm and a length of linear section of 1 mm. The maximum side-mode suppression ratio at a temperature of 290 K was 26 dB, the lasing wavelength was 7.73 μm.
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