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dc.contributor.authorChang, Guoqing
dc.contributor.authorLi, Chih-Hao
dc.contributor.authorPhillips, David M.
dc.contributor.authorWalsworth, Ronald L.
dc.contributor.authorKärtner, Franz X.
dc.date.accessioned2012-08-06T17:13:56Z
dc.date.issued2010
dc.identifier.citationChang, Guoqing, Chih-Hao Li, David F. Phillips, Ronald L. Walsworth, and Franz X. Kärtner. 2010. Toward a Broadband Astro-comb: Effects of Nonlinear Spectral Broadening in Optical Fibers. Optics Express 18(12): 12736-12747.en_US
dc.identifier.issn1094-4087en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:9367002
dc.description.abstractWe propose and analyze a new approach to generate a broadband astrocomb by spectral broadening of a narrowband astro-comb inside a highly nonlinear optical fiber. Numerical modeling shows that cascaded four-wave-mixing dramatically degrades the input comb’s side-mode suppression and causes side-mode amplitude asymmetry. These two detrimental effects can systematically shift the center-of-gravity of astro-comb spectral lines as measured by an astrophysical spectrograph with resolution \(\approx 100,000\); and thus lead to wavelength calibration inaccuracy and instability. Our simulations indicate that this performance penalty, as a result of nonlinear spectral broadening, can be compensated by using a filtering cavity configured for double-pass. As an explicit example, we present a design based on an Yb-fiber source comb (with 1GHz repetition rate) that is filtered by double-passing through a low finesse cavity (finesse = 208), and subsequent spectrally broadened in a 2-cm, SF6-glass photonic crystal fiber. Spanning more than 300 nm with 16 GHz line spacing, the resulting astrocomb is predicted to provide \(1 cm/s (\sim 10 kHz)\) radial velocity calibration accuracy for an astrophysical spectrograph. Such extreme performance will be necessary for the search for and characterization of Earth-like extra-solar planets, and in direct measurements of the change of the rate of cosmological expansion.en_US
dc.description.sponsorshipPhysicsen_US
dc.description.sponsorshipOther Research Uniten_US
dc.language.isoen_USen_US
dc.publisherOptical Society of Americaen_US
dc.relation.isversionofdoi:10.1364/OE.18.012736en_US
dc.relation.hasversionhttp://walsworth.physics.harvard.edu/publications/2010_Chang_OptExp.pdfen_US
dc.relation.hasversionhttp://arxiv.org/abs/1003.4680en_US
dash.licenseLAA
dc.subjectlaser frequency combsen_US
dc.subjectgenerationen_US
dc.subjectpulseen_US
dc.subjectcompressionen_US
dc.subjectcalibrationen_US
dc.subjectprecisionen_US
dc.titleToward a Broadband Astro-comb: Effects of Nonlinear Spectral Broadening in Optical Fibersen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalOptics Expressen_US
dash.depositing.authorWalsworth, Ronald L.
dc.date.available2012-08-06T17:13:56Z
dc.identifier.doi10.1364/OE.18.012736*
dash.contributor.affiliatedLi, Chih-Hao
dash.contributor.affiliatedPhillips, David M.
dash.contributor.affiliatedWalsworth, Ronald


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