Abstract

Wide-bandwidth phase lock between the tooth of a frequency comb and a CW extended-cavity diode laser at 1.55 μm is achieved by the use of an acousto-optical frequency shifter in a feed-forward configuration. The coherence properties of the comb are efficiently transferred to the CW laser, whose linewidth is narrowed down to the 10KHz comb level. A maximum control bandwidth of 0.6MHz has been experimentally achieved, limited by the transit time of the acoustic wave inside the frequency shifter.

© 2012 Optical Society of America

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