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

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Published 28/07/2012

Abstract

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.

Inspec keywords: optical waveguides; quantum cascade lasers; laser modes; submillimetre wave lasers; optical losses; resonant tunnelling

Other keywords: 141 micron; continuous wave mode; heatsink temperature; 17 K; 72 K; resonant phonon depopulation; resonant tunnelling; optical scattering; 40 K; high modal confinement; 2.1 THz; terahertz quantum cascade laser; 1.2 mW; low waveguide losses; pulsed mode

Subjects: Semiconductor lasers; Optical waveguides and couplers; Optical waveguides; Design of specific laser systems; Lasing action in semiconductors

References

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      • Faist, J.: 2003, Personal communication
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      • Kumar, S.: `Continuous-wave operation of terahertz quantum-cascade lasers above liquid nitrogen temperature', Appl. Phys. Lett., 2004
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