Title :
Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions
Author :
Wienold, M. ; Schrottke, L. ; Giehler, M. ; Hey, Roger ; Anders, W. ; Grahn, H.T.
Author_Institution :
Paul-Drude-Inst. fur Festkorperelektronik, Berlin, Germany
Abstract :
A report is presented on GaAs/(Al,Ga)As terahertz (THz) quantum-cascade lasers (QCLs) based on alternating photon and longitudinal optical (LO) phonon-assisted transitions between quasi-minibands. The design is optimised for low threshold current densities and low operating voltages, resulting in reduced ohmic heating during continuous-wave (CW) operation. The QCLs exhibit lasing over a broad range of frequencies from 2.91 to 3.21 THz. Using single-plasmon waveguides, pulsed operation up to 114 K and CW operation up to 65 K has been achieved.
Keywords :
phonons; quantum cascade lasers; submillimetre wave lasers; current density; frequency 2.91 THz to 3.21 THz; longitudinal optical phonons; phonon-assisted interminiband transitions; quantum-cascade lasers; submillimetre wave lasers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2009.1371
