Journal
OPTICS EXPRESS
Volume 20, Issue 19, Pages 21033-21043Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021033
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Funding
- National Science Foundation [ECCS-1102110]
- Air Force Office of Scientific Research [FA9550-12-1-0236]
- University of Maryland
- National Institute of Standards and Technology Center for Nanoscale Science and Technology through the University of Maryland [70NANB10H193]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102110] Funding Source: National Science Foundation
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Recent investigations of microcavity frequency combs based on cascaded four-wave mixing have revealed a link between the evolution of the optical spectrum and the observed temporal coherence. Here we study a silicon nitride microresonator for which the initial four-wave mixing sidebands are spaced by multiple free spectral ranges (FSRs) from the pump. Additional lines then fill in to yield a comb with single FSR spacing, resulting in partial coherence. By using a pulse shaper to select and manipulate the phase of various subsets of spectral lines, we are able to probe the structure of the coherence within the partially coherent comb. Our data demonstrate strong variation in the degree of mutual coherence between different groups of lines and provide support for a simple model of partially coherent comb formation. (C) 2012 Optical Society of America
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