Step well quantum cascade laser emitting at 3 THz

摘要

A quantum cascade laser based on a three well active module and emitting at 3 THz is demonstrated. The optical transition is vertical in real space and localized in an Al_(0.03)Ga_(0.97)As quantum well. Maximum operating temperature of 123 K in pulsed mode is reported, with threshold current densities as low as 110 A/cm~2 at 10 K and 175 A/cm~2 at 100 K. High slope efficiency values testify the good internal quantum efficiency of the structure.