Low frequency terahertz quantum cascade laser operating from 1.6to1.8THz

Abstract

The authors report a $\mathrm{Ga}\mathrm{As}∕{\mathrm{Al}}_{0.1}{\mathrm{Ga}}_{0.9}\mathrm{As}$ quantum cascade laser based on a bound-to-continuum transition optimized for low frequency operation. High tunability of the gain curve is achieved by the Stark effect and laser emission is measured between 1.6 and $1.8\mathrm{THz}$ . Pulsed mode operation up to $95\mathrm{K}$ and continuous wave operation up to $80\mathrm{K}$ are reported. The dynamical range in current is as high as 43%.