Study of the spatial characteristics of emission of surface-emitting ring quantum-cascade lasers
Babichev A.V. 1, Mikhailov D. A.2, Chistyakov D. V. 2, Kolodeznyi E.S. 1, Gladyshev A. G. 1, Voznyuk G. V. 2, Mitrofanov M. И. 2,3, Denisov D. V. 4, Slipchenko S.O. 2, Lyutetskii A. V. 2, Dudelev V. V. 2, Evtikhiev V. P. 2, Karachinsky L.Ya. 1, Novikov I.I. 1, Pikhtin N. A. 2, Egorov A.Yu. 5, Sokolovskii G.S. 2
1 ITMO University, St. Petersburg, Russia
2Ioffe Institute, St. Petersburg, Russia
3Submicron Heterostructures for Microelectronics, Research and Engineering Center, Russian Academy of Sciences, St. Petersburg, Russia
4St. Petersburg State Electrotechnical University “LETI", St. Petersburg, Russia
5Alferov Federal State Budgetary Institution of Higher Education and Science Saint Petersburg National Research Academic University of the Russian Academy of Sciences, St. Petersburg, Russia
Email: a.babichev@mail.ioffe.ru

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The results of studies of ring quantum-cascade lasers with surface emission due to a second-order grating formed in the top cladding layers are presented. Surface emission near 7.85 μm with a low threshold current density (3.8 kA/cm2), in comparison with ridge quantum-cascade lasers of the same cavity length is demonstrated. The results of measurements of the intensity distribution of the near and far fields at different pumping levels are presented. The estimated value of the angle of beam extraction relative to the surface normal is in the range (5.7-6.7)o. Keywords: ring cavity, grating, focused ion beam (FIB) etching, superlattices, quantum-cascade laser, epitaxy, indium phosphide.
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