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Spin Noise Spectroscopy in Rb Vapor
published by the University of Minnesota
Although undergraduate physics majors are introduced to concepts such as the fluctuation-dissipation theorem in statistical mechanics courses, they are almost never presented with a situation (with the possible exception of Johnson noise) in which useful information is extracted from a noise measurement. The experiment presented here demonstrates how detailed spectroscopic information about an atomic system can be extracted from a noise spectrum. The experiment is essentially a noise-based analog to the popular optical pumping experiment already present in many undergraduate laboratories. In this case, Faraday rotation is used to probe spin fluctuations of a gas of alkali atoms in thermal equilibrium in a small magnetic field. The demonstration will focus on Rb-85 and Rb-87, for which the low-field spectrum in a magnetic field is described by the Breit-Rabi formalism. Transitions between Zeeman-split hyperfine levels can be observed as peaks in the noise spectrum of the Faraday rotation signal, which is read out by a fast digitizer card and then Fourier-transformed. The experiment provides an excellent introduction to atomic physics, noise measurements, and signal processing.
Subjects Lab Level Resource Types
General Physics
- Collections
= Advanced Laboratories
Modern Physics
- Atomic Physics
= Fine Splitting
Quantum Physics
- Quantum Experiments
Thermo & Stat Mech
- General
- Advanced Undergraduate
- Instructional Material
= Instructor Guide/Manual
= Laboratory
= Student Guide
Material Category Formats Ratings
- Lab Manual
- application/pdf
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Format:
application/pdf
Access Rights:
Free access
Restriction:
© 2014 University of Minnesota
Keywords:
Faraday Rotation, noise, noise-based analog
Record Creator:
Metadata instance created December 8, 2015 by Ramon Torres-Isea
Record Updated:
December 8, 2015 by Ramon Torres-Isea
Last Update
when Cataloged:
August 1, 2014
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Record Link
AIP Format
(University of Minnesota, Minneapolis, 2014), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243).
AJP/PRST-PER
Spin Noise Spectroscopy in Rb Vapor, (University of Minnesota, Minneapolis, 2014), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243>.
APA Format
Spin Noise Spectroscopy in Rb Vapor. (2014, August 1). Retrieved July 25, 2017, from University of Minnesota: http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243
Chicago Format
University of Minnesota. Spin Noise Spectroscopy in Rb Vapor. Minneapolis: University of Minnesota, August 1, 2014. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243 (accessed 25 July 2017).
MLA Format
Spin Noise Spectroscopy in Rb Vapor. Minneapolis: University of Minnesota, 2014. 1 Aug. 2014. 25 July 2017 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243>.
BibTeX Export Format
@misc{ Title = {Spin Noise Spectroscopy in Rb Vapor}, Publisher = {University of Minnesota}, Volume = {2017}, Number = {25 July 2017}, Month = {August 1, 2014}, Year = {2014} }
Refer Export Format

%T Spin Noise Spectroscopy in Rb Vapor
%D August 1, 2014
%I University of Minnesota
%C Minneapolis
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243
%O application/pdf

EndNote Export Format

%0 Electronic Source
%D August 1, 2014
%T Spin Noise Spectroscopy in Rb Vapor
%I University of Minnesota
%V 2017
%N 25 July 2017
%8 August 1, 2014
%9 application/pdf
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=13825&DocID=4243


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