Fiber-laser frequency combs with subhertz relative linewidths |
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Authors: | Swann W C McFerran J J Coddington I Newbury N R Hartl I Fermann M E Westbrook P S Nicholson J W Feder K S Langrock C Fejer M M |
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Institution: | National Institute of Standards and Technology, Boulder, Colorado 80305, USA. |
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Abstract: | We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring the heterodyne beat signal between two independent frequency combs that are phase locked to a common cw optical reference. We demonstrate that the optical comb lines can exhibit instrument-limited, subhertz relative linewidths across the comb spectra from 1200 to 1720 nm with a residual integrated optical phase jitter of approximately 1 rad in a 60 mHz to 500 kHz bandwidth. The projected relative pulse timing jitter is approximately 1 fs. This performance approaches that of Ti:sapphire frequency combs. |
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