Abstract

We demonstrate an environmentally robust optical frequency comb based on a polarization-maintaining, all-fiber, figure-eight laser. The comb is phase locked to a cavity-stabilized cw laser by use of an intracavity electro-optic phase modulator yielding 1.6MHz feedback bandwidth. This high bandwidth provides close to shot-noise-limited residual phase noise between the comb and cw reference laser of 94dBcHz from 20Hzto200kHz and an integrated in-loop phase noise of 32mrad from 1Hzto1MHz. Moreover, the comb remains phase locked under significant mechanical vibrations of over 1g. This level of environmental robustness is an important step toward a fieldable fiber frequency comb.

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