Anisotropy of optoelectronic properties in InAs quantum-dash lasers on InP

Summary form only given. The spectral dependence of modal gain and the linewidth enhancement factor was investigated for a new type of diode laser. The active media of the laser was composed of low-dimensional nanostructures in the form of short wires. These wire-like nanostructures typically have length-to-width ratios of between 6:1 and 15:1 and are called "quantum dashes" (QDashes). It was shown previously that such lasers showed dependence of the threshold current density on the laser cavity orientation. Here we extend the study of these lasers by investigating the wavelength dependence of modal gain and the linewidth enhancement factor at subthreshold current densities for two different orientations of the dashes with respect to the axis of the laser cavity.