Surface-emitting quantum-cascade lasers with a grating formed by focused ion beam milling

Authors :: null Egorov A. Yu.
null Pikhtin N. A.
null Sokolovskii G. S.
null Novikov I. I.
null Karachinsky L. Ya.
null Evtikhiev V. P.
null Dudelev V. V.
null Lyutetskii A. V.
null Slipchenko S. O.
null Denisov D. V.
null Mitrofanov M.I .
null Voznyuk G. V.
null Gladyshev A. G.
null Kolodeznyi E. S.
null Mikhailov D. A.
null Babichev A. V.
Source :: Semiconductors. 56:689
Publication Year :: 2022
Publisher :: Ioffe Institute Russian Academy of Sciences, 2022.
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. Keywords: superlattices, quantum-cascade laser, epitaxy, indium phosphide, focused ion beam milling.

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