Spectral Singularities and a New Method of Generating Tunable Lasers

TL;DR

This paper investigates spectral singularities in a mirrorless gain medium setup and proposes a practical method for creating tunable lasers by adjusting gain parameters to achieve resonance effects.

Contribution

It introduces a simple planar slab gain medium configuration to realize spectral singularities and a novel method for tuning laser wavelength via gain coefficient adjustments.

Findings

Identified the gain and width parameters needed for spectral singularities.

Proposed a practical approach for tunable laser generation.

Potential applications in developing adjustable laser devices.

Abstract

We use a simple setup based on an infinite planar slab gain medium with no mirrors to explore the possibility of realizing a recently discovered resonance effect related to the mathematical concept of spectral singularity. In particular we determine the range of the gain coefficient g and the width L of the gain region required to achieve this resonance effect. We outline a method that allows for amplifying waves of desired wavelength by adjusting the gain coefficient (pumping intensity). We expect this method to have important practical applications in building tunable lasers