Bimodal Whispering-Gallery Mode Lasing in Micropillar Cavity Lasers
Babichev A. V. 1, Makhov I. S. 2, Kryzhanovskaya N. V. 2, Zadiranov Yu. M. 1, Salii Yu. A. 1, Kulagina M. M. 1, Kovach Ya. N.1,3, Bobrov M. A. 1, Vasiliev A. P. 1, Blokhin S. A. 1, Maleev N. A.1, Karachinsky L. Ya. 3, Novikov I. I. 3, Egorov A. Yu. 3
1Ioffe Institute, St. Petersburg, Russia
2HSE University, St. Petersburg, Russia
3ITMO University, St. Petersburg, Russia
Email: a.babichev@mail.ioffe.ru

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The results of the study of whispering-gallery mode splitting in lasers of the spectral range of 930-950 nm based on a vertical microcavity are presented. The use of non-absorbing distributed Bragg reflectors based on alternating Al0.2Ga0.8As/Al0.9Ga0.1As layers, made it possible to reduce the threshold optical pump power to 180 μW (for a 3 μm micropillar cavity laser). The bare quality factor for whispering-gallery modes exceeded 14 000. A significant energy distance between the modes (~ 80 μeV), along with high stability of the lasing wavelength with increasing pump level (~220 μeV), indicates the prospects for using these lasers to modulate the polarization of radiation. Keywords: quantum dots, molecular-beam epitaxy, Stransky-Krastanov mechanism, gallium arsenide, birefringence, bimodality.
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