Imaging of emission patterns in a T-shaped quantum wire laser

TL;DR

This paper presents spatially and spectrally resolved imaging of emission patterns in a GaAs T-shaped quantum wire laser, revealing detailed insights into the emission characteristics of the ground state and spontaneous emission.

Contribution

It provides high-resolution imaging that unambiguously assigns emission patterns to specific quantum wire states, enhancing understanding of their optical behavior.

Findings

Laser emission is circular and localized at the waveguide core.

Laser emission area is smaller than spontaneous emission area.

All emissions are attributed to the wire ground state and intersecting wells.

Abstract

Spatially and spectrally resolved microscopic images of spontaneous and stimulated emissions are imaged at the mirror facets of a GaAs T-shaped quantum wire laser with high uniformity. Laser emission from the one-dimensional ground state reveals a circular image located at the core of a T-shaped optical waveguide but significantly smaller in area than the low power spontaneous emission from the same waveguide. These images unambiguously allow assignment of all spontaneous and laser emissions to the wire ground state and respective intersecting wells in the structure.