Abstract
The results of studies of 7.5–8.0 μm range surface-emitting ring quantum-cascade lasers are presented. A second- order diffraction grating with a calculated coupling coefficient of ~9 cm–1 is formed on the entire surface of the ring cavity by focused ion beam milling. Surface-emitting lasing at room temperature near 7.75 μm with a threshold current density of ~8 kA/cm2 and an outer radius of the ring cavity of 202 μm is demonstrated. The results of studying the intensity distribution in the far-field near the normal to the surface showed the presence of two maxima. It is shown that the implemented coupling coefficient is not sufficient to ensure single-mode lasing in the studied ring quantum-cascade lasers.
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This study was supported financially by a grant from the Russian Science Foundation (project no. 20-79-10285).
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Babichev, A.V., Mikhailov, D.A., Kolodeznyi, E.S. et al. Surface-Emitting Quantum-Cascade Lasers with a Grating Formed by Focused Ion Beam Milling. Semiconductors 57, 445–450 (2023). https://doi.org/10.1134/S1063782623090038
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DOI: https://doi.org/10.1134/S1063782623090038