Continuous-wave operation of terahertz quantum-cascade lasers above liquid-nitrogen temperature

Kumar, Sushil; Williams, Benjamin S.; Kohen, Stephen; Hu, Qing; Reno, John L.
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2494
Academic Journal
We report cw operation of a quantum-cascade laser at 3.2 THz (λ≈94 μm) up to a heat-sink temperature of 93 K. Resonant longitudinal-optical phonon scattering is used to depopulate the lower radiative state and a low-loss metal–metal waveguide is used to provide high modal confinement. Optical powers of ∼1.8 mW at 10 K and ∼400 μW at 78 K are observed from a single facet of a 40-μm-wide and 1.35-mm-long laser device. A threshold current density of 432 A/cm2 at 10 K and 552 A/cm2 at 78 K was obtained in cw mode. The same device lased up to 129 K in pulsed mode with a threshold current density of 419 A/cm2 at 5 K. © 2004 American Institute of Physics.


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