Editing Axion (section)

=== Light shining through walls ===
Another technique is so called "light shining through walls",<ref>
{{cite conference
 |last=Ringwald |first=A.
 |date=16–21 October 2001
 |title=Fundamental Physics at an X-Ray Free Electron Laser
 |book-title=Electromagnetic Probes of Fundamental Physics – Proceedings of the Workshop
 |pages=63–74
 |conference=Workshop on Electromagnetic Probes of Fundamental Physics
 |location=[[Erice]], Italy
 |arxiv=hep-ph/0112254   |doi=10.1142/9789812704214_0007
 |isbn=978-981-238-566-6
}}</ref> where light passes through an intense magnetic field to convert photons into axions, which then pass through metal and are reconstituted as photons by another magnetic field on the other side of the barrier. Experiments by BFRS and a team led by Rizzo ruled out an axion cause.<ref name="rizzo_1">
{{cite journal
 |last1=Robilliard |first1=C.
 |last2=Battesti   |first2=R.
 |last3=Fouche     |first3=M.
 |last4=Mauchain   |first4=J.
 |last5=Sautivet   |first5=A.-M.
 |last6=Amiranoff  |first6=F.
 |last7=Rizzo      |first7=C.
 |year=2007
 |title=No 'light shining through a wall': Results from a photoregeneration experiment
 |journal=Physical Review Letters
 |volume=99  |issue=19  |page=190403
 |arxiv=0707.1296  |doi=10.1103/PhysRevLett.99.190403  |pmid=18233050
 |bibcode=2007PhRvL..99s0403R  |s2cid=23159010
}}
</ref> GammeV saw no events, reported in a 2008 Physics Review Letter. ALPS I conducted similar runs,<ref>
{{cite journal
 |last1=Ehret     |first1=Klaus    |last2=Frede      |first2=Maik
 |last3=Ghazaryan |first3=Samvel  |last4=Hildebrandt |first4=Matthias
 |last5=Knabbe    |first5=Ernst-Axel |last6=Kracht   |first6=Dietmar
 |last7=Lindner   |first7=Axel     |last8=List       |first8=Jenny
 |last9=Meier     |first9=Tobias   |last10=Meyer     |first10=Niels
 |last11=Notz     |first11=Dieter  |last12=Redondo   |first12=Javier
 |last13=Ringwald |first13=Andreas |last14=Wiedemann |first14=Günter
 |last15=Willke   |first15=Benno
 |display-authors=6
 |title=New ALPS results on hidden-sector lightweights
 |date=May 2010
 |journal= Physics Letters B
 |volume=689 |issue=4–5 |pages=149–155
 |doi=10.1016/j.physletb.2010.04.066
 |bibcode=2010PhLB..689..149E  |arxiv=1004.1313  |s2cid=58898031
 |url=http://pubman.mpdl.mpg.de/pubman/faces/viewItemOverviewPage.jsp?itemId=escidoc:417635
}}</ref> setting new constraints in 2010; ALPS&nbsp;II began collecting data in May 2023.<ref>{{cite journal |last1=Diaz Ortiz |first1=M. |last2=Gleason |first2=J. |last3=Grote |first3=H. |last4=Hallal |first4=A. |last5=Hartman |first5=M.T. |last6=Hollis |first6=H. |last7=Isleif |first7=K.-S. |last8=James |first8=A. |last9=Karan |first9=K. |last10=Kozlowski |first10=T. |last11=Lindner |first11=A. |last12=Messineo |first12=G. |last13=Mueller |first13=G. |last14=Põld |first14=J.H. |last15=Smith |first15=R.C.G. |last16=Spector |first16=A.D. |last17=Tanner |first17=D.B. |last18=Wei |first18=L.-W. |last19=Willke |first19=B. |title=Design of the ALPS II optical system |journal=Physics of the Dark Universe |date=March 2022 |volume=35 |pages=100968 |doi=10.1016/j.dark.2022.100968 |bibcode=2022PDU....3500968D |s2cid=222067049 |doi-access=free |arxiv=2009.14294 }}</ref><ref>{{cite web |date=2023-05-23 |title='Light shining through a wall' experiment ALPS starts searching for dark matter |url=https://www.desy.de/news/news_search/index_eng.html?openDirectAnchor=2758 |access-date=2024-09-25 |website=DESY |language=en}}</ref> OSQAR found no signal, limiting coupling,<ref>
{{cite journal
 |last1=Pugnat     |first1=P.    |last2=Ballou     |first2=R.
 |last3=Schott     |first3=M.    |last4=Husek      |first4=T.
 |last5=Sulc       |first5=M.    |last6=Deferne    |first6=G.
 |last7=Duvillaret |first7=L.    |last8=Finger     |first8=M.
 |last9=Finger     |first9=M.    |last10=Flekova   |first10=L.
 |last11=Hosek     |first11=J.   |last12=Jary      |first12=V.
 |last13=Jost      |first13=R.   |last14=Kral      |first14=M.
 |last15=Kunc      |first15=S.   |last16=MacUchova |first16=K.
 |last17=Meissner  |first17=K. A.|last18=Morville  |first18=J.
 |last19=Romanini  |first19=D.   |last20=Siemko    |first20=A.
 |last21=Slunecka  |first21=M.   |last22=Vitrant   |first22=G.
 |last23=Zicha     |first23=J.
 |display-authors=6
 |date=August 2014 
 |title=Search for weakly interacting sub-eV particles with the OSQAR laser-based experiment: Results and perspectives
 |journal=The European Physical Journal C
 |volume=74 |issue=8 |pages=3027
 |doi=10.1140/epjc/s10052-014-3027-8 |bibcode=2014EPJC...74.3027P
 |arxiv=1306.0443|s2cid=29889038 
}}</ref> and will continue.