title: Fiber-based device for the detection of low-intensity fluctuations of ultrashort pulses.
abstract: We describe a fiber-based device that can significantly enhance the low-intensity fluctuations of an ultrashort pulse train to detect them more easily than with usual direct detection systems. Taking advantage of the Raman intrapulse effect that progressively shifts the central frequency of a femtosecond pulse propagating in an anomalous dispersion fiber, a subsequent spectral filtering can efficiently increase the level of fluctuations by more than 1 order of magnitude. We show that attention has to be paid to maintain the shape of the statistical distribution unaffected by the nonlinear process.
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS—Université de Bourgogne, Dijon, France.
authors.forename: Charles Henri
authors.initials: CH
authors.lastname: Hage
authors.forename: Bertrand
authors.initials: B
authors.lastname: Kibler
authors.forename: Christophe
authors.initials: C
authors.lastname: Finot
mesh_terms: D004867:Equipment Design; D055096:Optical Devices; D013059:Spectrum Analysis, Raman / Q000379:methods