Results 81 to 90 of about 28,891 (190)
High-speed modulation of a terahertz quantum cascade laser by coherent acoustic phonon pulses
Nature Communications, 2020 The typical electronic modulation of terahertz quantum cascade lasers is fundamentally limited at fast timescales by device properties. Here the authors propose and study an alternative, acoustic mechanism for modulating such THz QCLs at high speed.
Aniela Dunn +13 more
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Substrate-emitting ring interband cascade lasers [PDF]
, 2017 The authors acknowledge the support by the Austrian Science Fund (FWF) projects P26100-N27 (H2N) and NextLite (F4909-N23), and the State of Bavaria. HD acknowledges financial support through an APART fellowship from the Austrian Academy of Sciences.We ...
Detz, Hermann +7 more
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Mode-locked short pulses from an 8 μm wavelength semiconductor laser
Nature Communications, 2020 Producing pulses in the mid-IR often requires bulky sources and has been inaccessible with compact and versatile quantum cascade lasers (QCLs). Here, the authors demonstrate actively mode-locked, mid-IR QCL operation at room temperature.
Johannes Hillbrand +6 more
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Extending device performance in photonic devices using piezoelectric properties [PDF]
, 2013 This study focuses on the influence of epi-layer strain and piezoelectric effects in asymmetric GaInAs/GaAlAs action regions that potentially lead to intra-cavity frequency mixing. The theoretical limits for conduction and valence band offsets in lattice-
Triplett, Gregory Edward
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New Opportunities in Mid-Infrared Emission Control
Sensors, 2015 Tunable laser absorption spectroscopy (TLAS) has been well accepted as a preferred measurement technique for many industrial applications in recent years, especially for in situ applications. Previously, mainly near-infrared lasers have been used in TLAS
Peter Geiser
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Estimating optical feedback from a chalcogenide fiber in mid-infrared quantum cascade lasers
AIP Advances, 2016 The amount of optical feedback originating from a chalcogenide fiber used to couple light from a mid-infrared quantum cascade laser is evaluated experimentally. Threshold reduction measurements on the fibered laser, combined with an analytical study of a
L. Jumpertz +8 more
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Interband Mid-IR Semiconductor Lasers
IEEE Photonics Journal, 2010 Significant advances in the room-temperature (RT) continuous-wave (CW) output power of both type-I quantum-well (QW) active-layer lasers and interband cascade lasers have been reported within the 3–4- $\mu\hbox{m}$ wavelength region in 2009 ...
L. J. Mawst
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Simulation of Transport and Gain in Quantum Cascade Lasers
, 2003 Quantum cascade lasers can be modeled within a hierarchy of different approaches: Standard rate equations for the electron densities in the levels, semiclassical Boltzmann equation for the microscopic distribution functions, and quantum kinetics ...
Lee, S. -C. +2 more
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Quantum-Dot Cascade Laser: Proposal for an Ultra-Low-Threshold Semiconductor Laser
, 1996 We propose a quantum-dot version of the quantum-well cascade laser of Faist et al. [Science {\bf 264}, 553 (1994)]. The elimination of single phonon decays by the three-dimensional confinement implies a several order-of-magnitude reduction in the ...
Stafford, Charles A., Wingreen, Ned S.
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Retrieval of phase relation and emission profile of quantum cascade laser frequency combs
, 2019 The major development recently undergone by quantum cascade lasers has effectively extended frequency comb emission to longer-wavelength spectral regions, i.e. the mid and far infrared.
Bartalini, Saverio +14 more
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