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Spin Noise Spectroscopy in Rb Vapor
written by Nicholas Nicholas and Paul Crowell
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 85Rb and 87Rb, 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
Modern Physics
- Atomic Physics
- General
- Advanced Undergraduate
- Instructional Material
= Laboratory
Material Category Formats Ratings
- Lab Manual
- application/pdf
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Format:
application/pdf
Access Rights:
Free access
Restriction:
Does not have a copyright, license, or other use restriction.
Keywords:
Noise Spectroscopy, Signal Processing
Record Creator:
Metadata instance created February 1, 2017 by Jeremiah Williams
Record Updated:
May 10, 2017 by Jeremiah Williams
Last Update
when Cataloged:
July 14, 2014
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Record Link
AIP Format
N. Nicholas and P. Crowell, (2014), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673).
AJP/PRST-PER
N. Nicholas and P. Crowell, Spin Noise Spectroscopy in Rb Vapor, (2014), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673>.
APA Format
Nicholas, N., & Crowell, P. (2014, July 14). Spin Noise Spectroscopy in Rb Vapor. Retrieved June 22, 2017, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673
Chicago Format
Nicholas, Nicholas, and Paul Crowell. Spin Noise Spectroscopy in Rb Vapor. July 14, 2014. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673 (accessed 22 June 2017).
MLA Format
Nicholas, Nicholas, and Paul Crowell. Spin Noise Spectroscopy in Rb Vapor. 2014. 14 July 2014. 22 June 2017 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673>.
BibTeX Export Format
@misc{ Author = "Nicholas Nicholas and Paul Crowell", Title = {Spin Noise Spectroscopy in Rb Vapor}, Volume = {2017}, Number = {22 June 2017}, Month = {July 14, 2014}, Year = {2014} }
Refer Export Format

%A Nicholas Nicholas
%A Paul Crowell
%T Spin Noise Spectroscopy in Rb Vapor
%D July 14, 2014
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673
%O application/pdf

EndNote Export Format

%0 Electronic Source
%A Nicholas, Nicholas
%A Crowell, Paul
%D July 14, 2014
%T Spin Noise Spectroscopy in Rb Vapor
%V 2017
%N 22 June 2017
%8 July 14, 2014
%9 application/pdf
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=14313&DocID=4673


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