Nonlinear dynamics in an artificial feedback spin maser

TL;DR

This paper explores complex nonlinear behaviors in an artificial feedback spin maser through simulations, revealing phenomena like harmonics and frequency combs, and proposes a pulse feedback protocol for enhanced magnetic sensing.

Contribution

It provides a comprehensive simulation of nonlinear dynamics in spin masers with artificial feedback and introduces a novel pulse feedback protocol for precision magnetometry.

Findings

Revealed high order harmonics and nonperiodic oscillations in spin masers

Demonstrated frequency comb generation via artificial feedback

Proposed a pulse feedback scheme for ultralow field magnetic sensing

Abstract

Spin masers with optical detection and artificial feedback are widely used in fundamental and practical applications. However, a full picture of the maser dynamics is still absent. By solving the feedback driven Bloch equations, we simulated the dynamics of an ideal spin maser in a broad parameter space. Rich nonlinear dynamics including high order harmonics generation, nonperiodic spin oscillations and frequency comb were revealed when the artificial feedback interaction exceeds the normal spin-field interaction. We also propose a pulse feedback spin maser protocol, which constructs an ultralow field magnetic frequency comb and could be useful in precision atomic magnetometers in searching for spin-dependent exotic interactions.