Using Quantum Coherence to Enhance Gain in Atomic Physics

TL;DR

This paper explores how quantum coherence can be utilized to significantly enhance gain in atomic systems, leading to more efficient lasing in the extreme ultra-violet and infra-red regimes, with a pedagogical focus.

Contribution

It demonstrates the application of quantum coherence to boost laser gain in specific wavelength regimes, providing a detailed, educational overview of the underlying physics.

Findings

Enhanced lasing energy in XUV and IR regimes using quantum coherence

Moderate external coherent drive can substantially increase laser gain

Discussion of the role of coherence in lasing enhancement

Abstract

Quantum coherence and interference effects in atomic and molecular physics has been extensively studied due to intriguing counterintuitive physics and potential important applications. Here we present one such application of using quantum coherence to generate and enhance gain in extreme ultra-violet(XUV)(@58.4nm in Helium) and infra-red(@794.76nm in Rubidium) regime of electromagnetic radiation. We show that using moderate external coherent drive, a substantial enhancement in the energy of the lasing pulse can be achieved under optimal conditions. We also discuss the role of coherence. The present paper is intended to be pedagogical on this subject of coherence-enhanced lasing.