Journal
OPTICS LETTERS
Volume 34, Issue 5, Pages 638-640Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.000638
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Funding
- National Institute of Standards and Technology (NIST)
- Swiss National Science Foundation (SNSF).
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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 1.6 MHz feedback bandwidth. This high bandwidth provides close to shot-noise-limited residual phase noise between the comb and cw reference laser of -94 dBc/Hz from 20 Hz to 200 kHz and an integrated in-loop phase noise of 32 mrad from 1 Hz to 1 MHz. Moreover, the comb remains phase locked under significant mechanical vibrations of over 1 g. This level of environmental robustness is an important step toward a fieldable fiber frequency comb.
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