Results 51 to 60 of about 28,891 (190)

Electric field domains in p-Si/SiGe quantum cascade structures [PDF]

, 2006
The formation of domains in quantum cascade structures is one of the mechanisms strongly affecting the operation of quantum cascade lasers, quantum-well infrared detectors, and other devices.
Harrison, P., Ikonic, Z., Kelsall, R.W.
core   +1 more source

Anti-correlation phenomena in quantum cascade laser frequency combs

APL Photonics, 2023
In quantum cascade laser frequency combs, the intensity distribution of the optical spectrum can be split into two well-separated lobes of longitudinal modes that, even when far apart, have a common phase relation and preserve equal frequency separation.
B. Chomet, T. Gabbrielli, D. Gacemi, F. Cappelli, L. Consolino, P. De Natale, F. Kapsalidis, A. Vasanelli, Y. Todorov, J. Faist, C. Sirtori   +10 more
doaj   +1 more source

Short pulse generation and mode control of broadband terahertz quantum cascade lasers

, 2016
We report on a waveguide engineering technique that enables the generation of a bandwidth up to 1 THz and record ultra-short pulse length of 2.5 ps in injection seeded terahertz quantum cascade lasers.
Bachmann, Dominic, Beck, Mattias, Darmo, Juraj, Faist, Jérôme, Rösch, Markus, Scalari, Giacomo, Süess, Martin J., Unterrainer, Karl   +7 more
core   +2 more sources

Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives

Sensors, 2016
We propose a self-consistent method for the analysis of granular materials at terahertz (THz) frequencies using a quantum cascade laser. The method is designed for signals acquired from a laser feedback interferometer, and applied to non-contact ...
She Han, Karl Bertling, Paul Dean, James Keeley, Andrew D. Burnett, Yah Leng Lim, Suraj P. Khanna, Alexander Valavanis, Edmund H. Linfield, A. Giles Davies, Dragan Indjin, Thomas Taimre, Aleksandar D. Rakić   +12 more
doaj   +1 more source

High Power Mid-Infrared Quantum Cascade Lasers Grown on GaAs

Photonics, 2022
The motivation behind this work is to show that InP-based intersubband lasers with high power can be realized on substrates with significant lattice mismatch.
Steven Slivken, Manijeh Razeghi
doaj   +1 more source

Analytical coupled-wave model for photonic crystal quantum cascade lasers

, 2017
A coupled-wave model is developed for photonic-crystal quantum cascade lasers. The analytical model provides an efficient analysis of full three-dimensional large-area device structure, and the validity is confirmed via simulations and previous ...
Faist, Jérôme, Hu, Weiwei, Liang, Yong, Peng, Chao, Wang, Zhixin, Yin, Xuefan   +5 more
core   +2 more sources

Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit

, 2010
A comprehensive investigation of the frequency-noise spectral density of a free-running mid-infrared quantum-cascade laser is presented for the first time.
Bartalini, S., Borri, S., Cancio, P., Castrillo, A., De Natale, P., Galli, I., Gianfrani, L., Giusfredi, G., Mazzotti, D.   +8 more
core   +1 more source

Laser feedback interferometry with THz QCLs: A new technology for imaging and materials analysis [PDF]

, 2016
Considerable interest exists for sensing and imaging technologies in the terahertz (THz) spectral range, in particular for the interrogation of materials of an organic or biological nature.
Agnew, G, Bertling, K, Cooper, JD, Davies, AG, Dean, P, Grier, A, Harrison, P, Ikonic, Z, Indjin, D, Khanna, SP, Lachab, M, Lim, YL, Linfield, EH, Qi, X, Rakic, AD, Taimre, T, Valavanis, A, Wilson, SJ   +17 more
core   +1 more source

Room temperature quantum cascade laser with ∼31% wall-plug efficiency

AIP Advances, 2020
In this article, we report the demonstration of a quantum cascade laser emitting at λ ≈ 4.9 μm with a wall-plug efficiency of ∼31% and an output power of ∼23 W in pulsed operation at room temperature with 50 cascade stages (Ns).
F. Wang, S. Slivken, D. H. Wu, M. Razeghi   +3 more
doaj   +1 more source

Active mode locking of quantum cascade lasers in an external ring cavity. [PDF]

Nat Commun, 2016
Revin DG, Hemingway M, Wang Y, Cockburn JW, Belyanin A.   +4 more
europepmc   +2 more sources