Semiconductor waveguide quantum well lasers

TL;DR

This paper demonstrates coherent semiconductor waveguide quantum well laser arrays compatible with silicon photonics, achieving low lasing thresholds and maintaining mutual coherence in arrays with specific modal widths and separations.

Contribution

It introduces a novel waveguide geometry for quantum well lasers on silicon substrates, with detailed analysis of their emission and coherence properties.

Findings

Lasing thresholds as low as 60 mW.

Arrays maintain mutual coherence.

Modal widths of 5-10 μm with 10-20 μm separation.

Abstract

Coherent laser arrays compatible with silicon photonics are demonstrated in a waveguide geometry in epitaxially grown semiconductor membrane quantum well lasers transferred on substrates of silicon carbide and oxidised silicon; we record lasing thresholds as low as 60 mW of pump power. We study the emission of single lasers and arrays of lasers in the sub-mm range. We are able to create waveguide laser arrays with modal widths of approximately 5-10 {\mu}m separated by 10-20 {\mu}m, using real and reciprocal space imaging we study their emission characteristics and find that they maintain their mutual coherence while operating on either single or multiple longitudinal modes per lasing cavity.