Single-mode quantum-cascade lasers with variable etching depth of grating slits
Babichev A. V. 1, Kharin N. Yu.2, Kolodeznyi E. S. 1, Papylev D. S.1, Voznyuk G. V.3, Mitrofanov M. I.3,4, Gladyshev A. G. 1, Slipchenko S. O. 3, Lyutetsky A. V. 3, Evtikhiev V. P.3, Panevin V. Yu.2, Karachinsky L. Ya.1, Novikov I. I. 1, Pikhtin N. A. 3, Egorov A. Yu. 1
1ITMO University, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
3Ioffe Institute, St. Petersburg, Russia
4Submicron Heterostructures for Microelectronics, Research and Engineering Center, Russian Academy of Sciences, St. Petersburg, Russia
Email: a.babichev@mail.ioffe.ru
The results of the study of surface-emitting quantumcascade lasers with a ring cavity radius of 284 μm were presented. The use of a grating with a variable etching depth (up to 4.6 μm) provided a single-mode lasing at a wavelength of 7.42 and 7.66 μm at a temperature of 85 and 293 K. The maximum side-mode suppression ratio was 23 dB at 293 K. The characteristic temperature T0 was 166 K. Keywords: quantum-cascade laser, single-mode lasing, indium phosphide, direct ion-beam lithography, grating.
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