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 $\sim 10\mathrm{KHz}$ comb level. A maximum control bandwidth of $\sim 0.6\mathrm{MHz}$ has been experimentally achieved, limited by the transit time of the acoustic wave inside the frequency shifter.

©2012 Optical Society of America

Analysis of the feed-forward method for the referencing of a CW laser to a frequency comb

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