Terahertz quantum-cascade laser operating up to 137 K

Williams, Benjamin S.; Kumar, Sushil; Callebaut, Hans; Qing Hu; Reno, John L.
December 2003
Applied Physics Letters;12/22/2003, Vol. 83 Issue 25, p5142
Academic Journal
We report operation of a terahertz quantum-cascade laser at 3.8 THz (λ≈79 μm) up to a heat-sink temperature of 137 K. A resonant phonon depopulation design was used with a low-loss metal–metal waveguide, which provided a confinement factor of nearly unity. A threshold current density of 625 A/cm[sup 2] was obtained in pulsed mode at 5 K. Devices fabricated using a conventional semi-insulating surface-plasmon waveguide lased up to 92 K with a threshold current density of 670 A/cm[sup 2] at 5 K. © 2003 American Institute of Physics.


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