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Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K
Mikhail A Belkin1, Jonathan A Fan, Sahand Hormoz
1Harvard School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA. mbelkin@seas.harvard.edu
Optics Express
|June 11, 2008
Abstract:
We report terahertz quantum cascade lasers operating in pulsed mode at an emission frequency of 3 THz and up to a maximum temperature of 178 K. 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.
