We have demonstrated stabilization of a fiber-optic Mach-Zehnderinterferometer, with a centimeter-scale path difference, to the transmissionminimum for the carrier wave of a frequency-modulated laser beam. Atime-averaged extinction of 32 dB, limited by the bandwidth of the feedback,was maintained over several hours. The interferometer was used to remove thecarrier wave from a 780 nm laser beam that had been phase modulated at 2.7 GHz.
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