Abstract

The quantum cascade laser (QCL) is a semiconductor laser that employs radiative transitions of an electron between the bounded states in a superlattice (SL) and phenomenon of resonant tunnelling. Here we present a QCL that operates in the terahertz (THz) spectral region at wavelength of 95μm. Important difference compared to previous terahertz QCL's based on GaAs/AlGaAs material system is choice of In_0.47Ga_0.53As/In_0.48Al_0.52As lattice matched to InP which has lighter electron effective mass that should lead to higher gain and better operation [1].

© 2009 IEEE