DUAL-WAVELENGTH LASER-EMISSION FROM A COUPLED SEMICONDUCTOR MICROCAVITY

We report photopumped operation of a monolithic coupled semiconductor microcavity laser. The structure consists of two lambda-sized GaAs ver tical cavities, one on top of the other, coupled together through a co mmon mirror. Due to a wedge induced into each cavity, the detuning bet ween the cavities can be continuously varied when moving across the sa mple. Depending on the detuning, laser action is simultaneously achiev ed at two different wavelength, or occurs only st one wavelength. At r esonance, we observe coupled dual-wavelength laser emission at two wid ely spaced wavelengths (13 nm) with the same threshold and same depend ence on pump power. (C) 1997 American Institute of Physics.