Open AccessBroadening of magnetic linewidth by spin-exchange interaction in the K-Rb-21Ne comagnetometer
Author(s) -
Kai Wei,
Tian Zhao,
Xiujie Fang,
Zitong Xu,
Yueyang Zhai,
Wei Quan,
Bangcheng Han
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.404259
Subject(s) - laser linewidth , relaxation (psychology) , polarization (electrochemistry) , magnetic field , alkali metal , spin polarization , atomic physics , materials science , condensed matter physics , nuclear magnetic resonance , physics , chemistry , optics , electron , psychology , social psychology , laser , quantum mechanics
The elimination of relaxation resulting from spin-exchange (SE) interaction is crucial for ultrasensitive atomic comagnetometers. In this study, we demonstrate the SE relaxation is only partially suppressed and significantly broadens the magnetic linewidth in the K-Rb- 21 Ne comagnetometer. The SE relaxation arises from the compensation magnetic field when operating in the self-compensation regime. We propose a new method to measure the SE relaxation in the self-compensation regime where the alkali-metal and noble-gas spin ensembles are coupled. In the presence of SE relaxation, we find the optimal alkali-metal polarization for maximizing the sensitivity is shifted from the typical value. Under various conditions, we present a detailed study of the SE relaxation and the scale factor as a function of alkali-metal polarization, which are further verified by the theoretical models. The reduction of SE relaxation and improvement of scale factor by using 87 Rb atoms is also studied.