title: Background suppression in synthesized pulse waveform by feedback control optimization for flatly broadened supercontinuum generation.
abstract: We demonstrate a method of background component suppression of synthesized pulses for flatly broadened supercontinuum (SC) generation. An adaptive pulse shaping in frequency domain achieved a 26 dB contrast between pulse center and background level in auto-correlation trace by combining two fitness functions during feedback-controlled pulse shaping. The pulse was used as a SC pump, and the spectral peak of the SC at the pump wavelength was suppressed by 5 dB using the combination scheme. Simulation results show that the phase spectra control is required to be within ± π/100 rad to suppress the spectral peak below 3 dB. The results show that adaptive pulse shaping is required to improve SC flatness due to the small mismatch tolerance.
authors.affiliation: Department of Electrical and Electronic Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan. kkash@cc.tuat.ac.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Kashiwagi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ishizu
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kodama
authors.forename: Takashi
authors.initials: T
authors.lastname: Kurokawa
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D007834:Lasers; D008027:Light; D012542:Scattering, Radiation