Two-Level Laser Dynamics with a Noiseless Vacuum Reservoir

TL;DR

This paper investigates the quantum properties of light emitted by a two-level laser system with a noiseless vacuum reservoir, revealing conditions for coherent and chaotic light generation and photon confinement.

Contribution

It provides a novel analysis of two-level laser dynamics coupled to a vacuum reservoir, highlighting the nature of emitted light and photon distribution.

Findings

Laser generates coherent light above threshold

Laser produces chaotic light at threshold

Photon number is confined to a small frequency range

Abstract

We analyze the quantum properties of the light generated by a two-level laser in which the two-level atoms available in a closed cavity are pumped to the upper level by means of electron bombardment. We consider the case in which the two-level laser is coupled to a vacuum reservoir via a single-port mirror and seek to carry out our analysis by putting the noise operators associated with the vacuum reservoir in normal order. It is found that the two-level laser generates coherent light when operating well above threshold and chaotic light when operating at threshold. Moreover, we have established that a large part of the total mean photon number is confined in a relatively small frequency interval.