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Pinel O
; Everett JL
; Hosseini M
; Campbell GT
; Buchler BC
; Lam PK
Sci Rep
2015[Dec]; 5
(?): 17633
PMID26655839
show ga
Optical resonance is central to a wide range of optical devices and techniques.
In an optical cavity, the round-trip length and mirror reflectivity can be chosen
to optimize the circulating optical power, linewidth, and free-spectral range
(FSR) for a given application. In this paper we show how an atomic spinwave
system, with no physical mirrors, can behave in a manner that is analogous to an
optical cavity. We demonstrate this similarity by characterising the build-up and
decay of the resonance in the time domain, and measuring the effective optical
linewidth and FSR in the frequency domain. Our spinwave is generated in a 20?cm
long Rb gas cell, yet it facilitates an effective FSR of 83?kHz, which would
require a round-trip path of 3.6?km in a free-space optical cavity. Furthermore,
the spinwave coupling is controllable enabling dynamic tuning of the effective
cavity parameters.