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Surface Emitting Quantum-Cascade Lasers with a Second-Order Grating and Elevated Coefficient of Coupling

A. V. Babichev, E. S. Kolodeznyi, A. G. Gladyshev,N. Yu. Kharin, A. D. Petruk,V. Yu. Panevin,G. V. Voznyuk,M. I. Mitrofanov,S. O. Slipchenko, A. V. Lyutetskii,V. P. Evtikhiev,L. Ya. Karachinsky, I. I. Novikov, N. A. Pikhtin, A. Yu. Egorov

Bulletin of the Russian Academy of Sciences: Physics（2023）

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Abstract
A study is performed of features of surface-emitting quantum-cascade lasers with a ring resonator and second-order diffraction grating. The coefficient of coupling can be raised to 12 cm −1 by selecting the modes for direct ion lithography etching. Lasing is done near 7.6 μm with a threshold current density of only 0.3 kA/cm 2 .
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quantum-cascade,second-order
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