V. V. Dyudelev, D. A. Mikhailov, A. V. Babichev, S. N. Losev, D. V. Chistyakov, E. A. Kognovitskaya, D. D. Avrov, S. O. Slipchenko, A. V. Lyutetskiy, N. A. Pikhtin, A. G. Gladyshev, L. Ya. Karachinsky, I. I. Novikov, V. I. Kuchinskii, A. Yu. Egorov, G. S. Sokolovskii, “Generation of frequency combs by quantum cascade lasers emitting in the 8-<nobr>$\mu$</nobr>m wavelength range”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2019, Volume 45, Issue 20,Pages <nobr>18

This article is cited in 2 papers

Generation of frequency combs by quantum cascade lasers emitting in the 8-$\mu$m wavelength range

V. V. Dyudelev^a, D. A. Mikhailov^b, A. V. Babichev^a, S. N. Losev^a, D. V. Chistyakov^c, E. A. Kognovitskaya^ab, D. D. Avrov^b, S. O. Slipchenko^a, A. V. Lyutetskiy^a, N. A. Pikhtin^a, A. G. Gladyshev^d, L. Ya. Karachinsky^cd, I. I. Novikov^cd, V. I. Kuchinskii^a, A. Yu. Egorov^c, G. S. Sokolovskii^a

^a Ioffe Institute, St. Petersburg
^b Saint Petersburg Electrotechnical University "LETI"
^c St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^d Connector Optics LLC, St. Petersburg

Abstract: We have studied the generation of frequency combs by quantum cascade lasers (QCLs) emitting in the 8-$\mu$m wavelength range. Results showed the presence of a self-pulsation regime near the lasing threshold. Further increase in the pumping current led to a sharp increase in width of the lasing spectrum, which allowed us to obtain frequency combs with a spectral width exceeding 1.5 THz. This behavior of QCLs can be explained by radiation absorption at the stripe edge that is related to the penetration of waveguide mode into unpumped regions.

Keywords: quantum cascade laser, frequency comb, Q-switching, mode locking.

Received: 05.06.2019
Revised: 05.06.2019
Accepted: 01.07.2019

DOI: 10.21883/PJTF.2019.20.48387.17905