Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second

Details Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second Long-distance remote comparison of ultrastable optical frequencies with 1e-15 instability in fractions of a second

2009-08-28

arxiv.org/abs/0908.4238v3

Opt. Express 18, 21477 (2010)

Physics

Optics

7 pages, 4 figures

Scientific paper

We demonstrate a fully optical, long-distance remote comparison of independent ultrastable optical frequencies reaching a short term stability that is superior to any reported remote comparison of optical frequencies. We use two ultrastable lasers, which are separated by a geographical distance of more than 50 km, and compare them via a 73 km long phase-stabilized fiber in a commercial telecommunication network. The remote characterization spans more than one optical octave and reaches a fractional frequency instability between the independent ultrastable laser systems of 3e-15 in 0.1 s. The achieved performance at 100 ms represents an improvement by one order of magnitude to any previously reported remote comparison of optical frequencies and enables future remote dissemination of the stability of 100 mHz linewidth lasers within seconds.

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