Testing ultrafast mode-locking at microhertz relative optical linewidth
Michael J. Martin, Seth M. Foreman, T. R. Schibli, and Jun Ye
TL;DR
This paper demonstrates that ultrafast mode-locking in a Ti:sapphire comb maintains extremely high phase coherence across an octave, with a relative linewidth below 2.5 micro Hz, confirming strong quantum noise correlation.
Contribution
It provides new experimental limits on phase coherence in octave-spanning combs, showing mode-locking correlates quantum noise better than previously predicted.
Findings
Mode-locking correlates optical phase across an octave
Relative linewidth is less than 2.5 micro Hz
Quantum noise is strongly correlated across the spectrum
Abstract
We report new limits on the phase coherence of the ultrafast mode-locking process in an octave-spanning Ti:sapphire comb. We find that the mode-locking mechanism correlates optical phase across a full optical octave with less than 2.5 micro Hz relative linewidth. This result is at least two orders of magnitude below recent predictions for quantum-limited individual comb-mode linewidths, verifying that the mode-locking mechanism strongly correlates quantum noise across the comb spectrum.
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