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Resonant-phonon terahertz quantum-cascade laser operating at 2.1 THz (λ≃141 μm)

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4 Author(s)
Williams, B.S. ; Dept. of Electr. Eng., Massachusetts Inst. of Technol., Cambridge, MA, USA ; Kumar, S. ; Hu, Q. ; Reno, J.L.

The development of quantum-cascade lasers (QCLs) at 2.1 THz (λ≃141 μm), which is the longest wavelength QCL to date without the assistance of magnetic fields, is reported. This laser uses a structure based on resonant-phonon depopulation, and a metal-metal waveguide to obtain high modal confinement with low waveguide losses. Lasing was observed up to a heatsink temperature of 72 K in pulsed mode and 40 K in continuous-wave (CW) mode, and 1.2 mW of power was obtained in CW mode at 17 K.

Published in:

Electronics Letters  (Volume:40 ,  Issue: 7 )

Date of Publication:

1 April 2004

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