Stabilized fiber-optic Mach-Zehnder interferometer for carrier-frequency rejection.
We have demonstrated stabilization of a fiber-optic Mach-Zehnder interferometer, with a centimeter-scale path difference, to the transmission minimum for the carrier wave of a frequency-modulated laser beam. A time-averaged extinction of 32 dB, limited by the bandwidth of the feedback, was maintained over several hours. The interferometer was used to remove the carrier wave from a 780 nm laser beam that had been phase modulated at 2.7 GHz.
School of Physics and Astronomy, University of Southampton, Highfield, Southampton, UK. nlc2g09@soton.ac.uk
Nathan
N
Cooper
Jonathan
J
Woods
James
J
Bateman
Alexander
A
Dunning
Tim
T
Freegarde