Probing coherence in microcavity frequency combs via optical pulse shaping

Fahmida Ferdous, Houxun Miao, Pei Hsun Wang, Daniel E. Leaird, Kartik Srinivasan, Lei Chen, Vladimir Aksyuk, Andrew M. Weiner

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


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.

Original languageEnglish
Pages (from-to)21033-21043
Number of pages11
JournalOptics Express
Issue number19
StatePublished - 10 Sep 2012


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