SABRE and PHIP pumped RASER and the route to chaos.

ABSTRACT: In a RASER (Radio-frequency Amplification by Stimulated Emission of Radiation), the fast relaxing electromagnetic modes of an LC resonator are enslaved by the slow nuclear spin motion, whose coherence decays with the transverse relaxation rate γ_m=1/T₂^∗. Such a system obeys the slaving principle, mathematically identical with the adiabatic elimination procedure, leading to multi-mode RASER equations. If the pumping rate of nuclear spin polarization Γ>>γ_m, a second adiabatic elimination process applies and the spectral properties of the RASER can be predicted. The resulting model is similar to the model of two non-linear coupled oscillators and predicts the observed RASER phenomena, including frequency combs and mode collapse. If the second adiabat

SUBMITTER: Appelt S 

PROVIDER: S-EPMC8026265 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature