Lasing of Quantum-Dot Micropillar Lasers under Elevated Temperatures

TL;DR

This paper models micropillar lasers with hybrid mirrors, showing high quality factors and lasing up to 220 K with specific thresholds, advancing understanding of temperature effects in quantum-dot lasers.

Contribution

It provides a detailed numerical analysis of microcavity parameters and demonstrates lasing performance at elevated temperatures.

Findings

High quality-factor (~65000) for 5 μm pillars with hybrid dielectric-semiconductor mirrors.

Minimum laser threshold (~370 μW) at 130 K close to zero gain-cavity detuning.

Lasing achieved up to 220 K with a threshold of about 2.2 mW.

Abstract

A comprehensive numerical modelling of microcavity parameters for micropillar lasers with optical pumping was presented. The structure with a hybrid dielectric-semiconductor top mirror has a significantly higher calculated quality-factor (~65000 for 5 $\mu$m pillar) due to better vertical mode confinement. The minimum laser threshold (~370 $\mu$W for 5 $\mu$m pillar) coincided with a temperature of 130 K, which is close to zero gain to cavity detuning. Lasing up to 220 K was demonstrated with a laser threshold of about 2.2 mW.