Gain in a quantum wire laser of high uniformity

TL;DR

This paper reports the development of a highly uniform multi-quantum wire laser operating in the 1-D ground state, demonstrating narrow emission lines, low lasing threshold, and Coulomb interaction effects on gain.

Contribution

It presents a novel high-uniformity quantum wire laser with detailed analysis of Coulomb interactions affecting lasing behavior.

Findings

Achieved laser operation in a highly uniform quantum wire structure.

Observed free exciton emission with unprecedented narrow width.

Identified Coulomb interactions as significant in laser gain and emission shifts.

Abstract

A multi-quantum wire laser operating in the 1-D ground state has been achieved in a very high uniformity structure that shows free exciton emission with unprecedented narrow width and low lasing threshold. Under optical pumping the spontaneous emission evolves from a sharp free exciton peak to a red-shifted broad band. The lasing photon energy occurs about 5 meV below the free exciton. The observed shift excludes free excitons in lasing and our results show that Coulomb interactions in the 1-D electron-hole system shift the spontaneous emission and play significant roles in laser gain.