Abstract

An efficient locking technique based on optical feedback is demonstrated to suppress jitter on the rf beat note between the two modes of a dual-frequency Yb:Er glass laser. The method consists of a self-injection process in which one selected mode serves as a master oscillator to lock and stabilize the second mode via a frequency-shifted optical feedback. The beat note adjusted near 170MHz was stabilized with an accuracy of 250mHz using an optical feedback loop with a double pass through an acousto-optic modulator. The beating note can be tuned over 300kHz by controlling the reference oscillator. The extensions and limitations of the technique are discussed.

© 2007 Optical Society of America

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