Optical excitation and characterization of gigahertz acoustic resonances in optical fiber tapers

Myeong Soo Kang; Brenn, André; Wiederhecker, Gustavo S.; Russell, Philip St.J.
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131110
Academic Journal
Transverse acoustic resonances at gigahertz frequencies are excited by electrostriction in the few-micrometer-thick waists of low-loss optical fiber tapers of up to 40 cm long. A pump-probe technique is used in which the resonances are excited by a train of optical pulses and probed in a Sagnac interferometer. Strong radially symmetric acoustic resonances are observed and the dependence of their frequencies on taper thickness is investigated. Such easily reconfigurable acousto-optic interactions may have applications in the high-frequency mode locking of fiber lasers.


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