Demonstration of coherent emission from high-$\beta$ photonic crystal nanolasers at room temperature

TL;DR

This paper demonstrates room-temperature coherent lasing from high-$eta$ photonic crystal nanolasers using quantum dots, showing a smooth transition to coherence and operation at low thresholds.

Contribution

It presents the first room-temperature coherent emission from high-$eta$ photonic crystal nanolasers with quantum dots, highlighting their low threshold and high efficiency.

Findings

Lasing achieved at room temperature and telecom wavelength

High spontaneous emission coupling factor ($eta$) observed

Coherent emission confirmed at 8 times the threshold

Abstract

We report on lasing at room temperature and at telecommunications wavelength from photonic crystal nanocavities based on InAsP/InP quantum dots. Such laser cavities with a small modal volume and high quality factor display a high spontaneous emission coupling factor beta. Lasing is confirmed by measuring the second order autocorrelation function. A smooth transition from chaotic to coherent emission is observed, and coherent emission is obtained at 8 times the threshold power.