New Open Access paper is published in Issue 6 (June 2023):
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, Surface Emitting Quantum-Cascade Lasers with a Second-Order Grating and Elevated Coefficient of Coupling, Bulletin of the Russian Academy of Sciences: Physics, volume 87, issue 6, pages 750-754 (2023).
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/cm2.