Terahertz quantum cascade lasers

@article{Williams2008TerahertzQC,
  title={Terahertz quantum cascade lasers},
  author={Benjamin S. Williams},
  journal={2008 Asia Optical Fiber Communication \& Optoelectronic Exposition \& Conference},
  year={2008},
  pages={1-3}
}
  • B. Williams
  • Published 1 September 2007
  • Physics
  • 2008 Asia Optical Fiber Communication & Optoelectronic Exposition & Conference
An overview of terahertz quantum cascade lasers based on resonant-phonon depopulation is presented. Limiting mechanisms for high-temperature operation are discussed. 

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We report the demonstration of quantum-cascade lasers at ~4.4 THz (lambda ~ 68 mum) that emit 248 mW peak power in pulsed mode, and 138 mW continuous-wave power at heat-sink temperatures of 10 K.

Horn antennas for terahertz quantum cascade lasers

Far-field pattern and extraction efficiency of double metal 1.8 THz quantum cascade lasers (QCL) are controlled using miniaturised horn antennas. Enhancement of the optical output power of ten times

Far infrared quantum-cascade lasers based on a bound-to-continuum transition

Laser emission at about 3.5 THz from quantum cascade lasers based on a bound-to-continuum transition is reported. Maximum pulsed operation temperature is above liquid nitrogen (90 K). CW operation

Terahertz quantum-cascade lasers based on a three-well active module

The authors report on a design of terahertz quantum-cascade lasers based on three-well active modules. Each module consists of two tunnel-coupled wells for the two lasing states and another well for

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TLDR
The spectral linewidths of three continuous-wave quantum cascade lasers operating at terahertz frequencies are measured by heterodyning the free-running quantum cascade laser with two far-infrared gas lasers using a GaAs diode mixer and a microwave spectrum analyzer.

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THz quantum cascade lasers based on a novel buried cavity geometry are demonstrated by combining double-metal waveguides with proton im plantation. Devices are realised with emission at 2.8 THz,

Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K.

TLDR
The improvement in the maximum operating temperature is achieved by using a three-quantum-well active region design with resonant-phonon depopulation and by utilizing copper, instead of gold, for the cladding material in the metal-metal waveguides.

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Low-threshold terahertz quantum-cascade lasers

A quantum-cascade laser operating at λ=66 μm is demonstrated. It consists of a three-quantum-well chirped-superlattice active region embedded in a waveguide based on a single interface plasmon and a

Low frequency terahertz quantum cascade laser operating from 1.6to1.8THz

The authors report a GaAs∕Al0.1Ga0.9As quantum cascade laser based on a bound-to-continuum transition optimized for low frequency operation. High tunability of the gain curve is achieved by the Stark
...