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VERSION:2.0
PRODID:Icfo
X-PUBLISHED-TTL:P1W
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UID:69d28e7136b8c
DTSTART:20230726T090000Z
SEQUENCE:0
TRANSP:OPAQUE
LOCATION:ICFO Auditorium and Online (Teams)
SUMMARY:ICFO | CHIARA MAZZINGHI
CLASS:PUBLIC
DESCRIPTION:In this work we propose and demonstrate cavity-enhanced polariz
 ation rotation to detect magnetic effects in transparent media with greate
 r sensitivity at equal optical disturbance to the atomic medium. We use th
 e Jones calculus to compute the effective polarization rotation effect in 
 a cavity containing a magnetic medium. We include the losses due to enclos
 ure window or other sources. The results show that to measure polarization
  rotation collecting the transmitted light has advantages in terms of line
 arity and simplicity with respect to collecting the reflected light. We sh
 ow also the description of a ``commensurate lattice''\, to position the at
 oms at the anti-nodes of the probing light: this increases the atom-light 
 coupling and therefore the cavity enhancement. The trapping light is also 
 used to stabilize the cavity.\nThen we describe the experimental realizati
 on of the cavity and we demonstrate the theory described by measuring the 
 Faraday rotation in a Rb-87 atomic ensemble in the single-pass and cavity 
 enhanced geometries. We observe the\nenhancement given by the cavity in go
 od agreement with the theoretical predictions. We also demonstrate shot-no
 ise-limited operation of the enhanced rotation scheme in a small angle reg
 ime.\nWe conclude with the expected squeezing effect given by the cavity i
 n a cold and ultra-cold ensembles. The cavity tested gives a measurement s
 queezing 5 dB larger with respect to the SP case.\nThesis Director: Prof D
 r. Morgan W. Mitchell
DTSTAMP:20260405T163145Z
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