Generation of Frequency Combs by Quantum Cascade Lasers Emitting in the 8-μm Wavelength Range

Journal Article · Tue Oct 15 00:00:00 EDT 2019 · Technical Physics Letters

DOI:https://doi.org/10.1134/S1063785019100201· OSTI ID:22929150

Dudelev, V. V. ^[1]; Mikhailov, D. A. ^[2]; Babichev, A. V.; Losev, S. N. ^[1]; Chistyakov, D. V. ^[3]; Kognovitskaya, E. A. ^[1]; Avrov, D. D. ^[2]; Slipchenko, S. O.; Lyutetskii, A. V.; Pikhtin, N. A. ^[1]; Gladyshev, A. G. ^[4]; Karachinsky, L. Ya.; Novikov, I. I. ^[3]; Kuchinskii, V. I. ^[1]; Egorov, A. Yu. ^[3]

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1. Ioffe Institute (Russian Federation)
2. St. Petersburg Electrotechnical University LETI (Russian Federation)
3. ITMO University (Russian Federation)
4. Connector Optics LLC (Russian Federation)

We have studied the generation of frequency combs by quantum cascade lasers (QCLs) emitting in the 8-μm 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.

• OSTI ID: 22929150
• Journal Information: Technical Physics Letters, Journal Name: Technical Physics Letters Journal Issue: 10 Vol. 45; ISSN 1063-7850
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
LASERS
MODE LOCKING
PULSATIONS
PUMPING
Q-SWITCHING
SPECTRA
THZ RANGE
WAVEGUIDES
WAVELENGTHS