Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides.
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Single-mode surface-emitting distributed feedback terahertz quantum-cascade lasers operating around 2.9 THz are developed in metal-metal waveguides using precise control of phase of reflection at the facets and use of metal on the sidewalls to eliminate higher-order lateral modes allow robust single-mode operation over a range of approximately 0.35 THz.Abstract:
Single-mode surface-emitting distributed feedback terahertz quantumcascade lasers operating around 2.9 THz are developed in metal-metal waveguides. A combination of techniques including precise control of phase of reflection at the facets, and u e of metal on the sidewalls to eliminate higher-order lateral modes allow robust single-mode operation over a range of approximately 0.35 THz. Single-lobed far-field radiation pattern is obtained using a pi phase-shift in center of the second-order Bragg grating. A grating device operating at 2.93 THz lased up to 149 K in pulsed mode and a temperature tuning of 19 .7 GHz was observed from 5 K to 147 K. The same device lased up to 78 K in continuous-wave (cw) mode emitting more than 6 m W of cw power at 5 K. ln general, maximum temperature of pulsed operation for grating devices was within a few Kelvin of that of multi-mode Fabry-Perot ridge lasersread more
Citations
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Terahertz quantum-cascade lasers
TL;DR: In this paper, the state-of-the-art and future prospects for terahertz quantum-cascade laser systems are reviewed, including efforts to increase their operating temperatures, deliver higher output powers and emit longer wavelengths.
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Quantum cascade lasers: 20 years of challenges.
TL;DR: The most recent technological and application advances of quantum cascade lasers are reviewed, underlining the present milestones and future directions from the Mid-infrared to the Terahertz spectral range.
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Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions
Yannick Chassagneux,Raffaele Colombelli,W. Maineult,Stefano Barbieri,Harvey E. Beere,David A. Ritchie,Suraj P. Khanna,Edmund H. Linfield,Alexander Giles Davies +8 more
TL;DR: By demonstrating a general technique to implement reflecting or absorbing boundaries, this work produces evidence that whispering-gallery-like modes or true photonic-crystal states can be alternatively excited and provides a solution for the quasi-total lack of directionality typical of THz semiconductor lasers based on metal–metal waveguides.
Journal ArticleDOI
Quantum cascade lasers: a versatile source for precise measurements in the mid/far-infrared range
TL;DR: In this article, the authors provide an overview of recent developments of quantum cascade lasers (QCLs), from the mid-infrared (mid-IR) to the far-IR (THz) range, with a special focus on their metrological-grade applications in a number of fields.
Journal ArticleDOI
Low-divergence single-mode terahertz quantum cascade laser
TL;DR: In this article, a distributed feedback design of a double-metal waveguide quantum cascade laser is presented, which features a grating resonant with the third-order Bragg condition.
References
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Terahertz semiconductor-heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: A monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is reported, which is very promising for extending the present laser concept to continuous-wave and high-temperature operation, which would lead to implementation in practical photonic systems.
Terahertz semiconductor heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: In this article, a monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is presented.
Journal ArticleDOI
Optical properties of fourteen metals in the infrared and far infrared: Al, Co, Cu, Au, Fe, Pb, Mo, Ni, Pd, Pt, Ag, Ti, V, and W.
TL;DR: Refinements in the fitting technique have resulted in only slight changes in the Drude model parameters for Al, Au, Ag, and W, and the optical resistivity has been calculated from the Druded model parameters ωτ and ωp and compared to handbook values for the dc resistivity.
Journal ArticleDOI
Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode.
TL;DR: The demonstration of a terahertz quantum-cascade laser that operates up to 164 K in pulsed mode and 117 K in continuous-wave mode at approximately 3.0 THz is reported.
Journal ArticleDOI
Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement
TL;DR: In this article, a double-sided metal waveguide was used for lasing at ∼3.0 ε-THz (λ≈98-102 µm) in a quantum-cascade structure.