Open AccessBackground suppression in synthesized pulse waveform by feedback control optimization for flatly broadened supercontinuum generation
Author(s) -
Ken Kashiwagi,
Hiroyuki Ishizu,
Y. Kodama,
Takashi Kurokawa
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.003001
Subject(s) - supercontinuum , optics , pulse shaping , pulse (music) , pulse width modulation , femtosecond pulse shaping , waveform , physics , flatness (cosmology) , multiphoton intrapulse interference phase scan , materials science , wavelength , ultrashort pulse , laser , photonic crystal fiber , power (physics) , cosmology , quantum mechanics , voltage , detector
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.