Femtosecond superradiance in multiple-section InGaN/GaN quantum well laser structures

TL;DR

This paper theoretically investigates the potential for femtosecond superradiant emission in InGaN/GaN quantum well laser structures, predicting ultra-short, high-power pulses due to macroscopic coherence buildup.

Contribution

It introduces a model based on Maxwell-Bloch equations linking superradiance with phase transition theory in GaN-based quantum wells.

Findings

Predicts superradiant pulses as short as 500 fs

Peak powers over 200 W in the blue/violet range

Shows superradiance governed by Ginzburg-Landau phase transition

Abstract

We analyze theoretically a possibility of the superradiant emission (SR) in GaN-based quantum well (QW) laser heterostructures. Our model is based on travelling wave Maxwell-Bloch equations predicts building up of macroscopic coherences in the ensemble of carriers in the QWs. We show that SR is covered by the Ginzburg-Landau equation for phase transition to coherent matter state. The generation of superradiant pulses as short as 500 fs at peak powers of over 200 W has been predicted for InGaN/GaN heterostructure QWs with the peak emission in the blue/violet wavelength range.