Device and method for generating bursts of picosecond...

G - Physics – 02 – F

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G02F 1/00 (2006.01) H01S 3/067 (2006.01) H01S 3/10 (2006.01)

Patent

CA 2743373

A method and device are provided for generating bursts of sub-pulses, preferably in the picosecond range. Seed pulses are first generated, and then phase modulated to spread their spectral profile to several time-dependent spectral components. The phase modulated seed pulses are then spectrally filtered to remove spectral components and retain only selected ones, creating gaps in the amplitude profile of the seed pulses which therefore form bursts of sub-pulses. Various parameters such as the modulation amplitude, the modulation frequency, the spectral characteristics of the filters and the overall amplitude of the seed pulses may be controlled to provide a great versatility and adaptability.

Linvention concerne un procédé et un dispositif pour générer des rafales de sous-impulsions, de préférence dans la gamme des picosecondes. Des impulsions mères sont tout dabord générées et ensuite modulées en phase pour étaler leur profil spectral sur plusieurs composantes spectrales dépendantes du temps. Les impulsions mères modulées en phase sont ensuite soumises à un filtrage spectral pour supprimer les composantes spectrales et retenir uniquement celles qui sont sélectionnées, ce qui crée des interstices dans le profil damplitude des impulsions mères, produisant ainsi des rafales de sous-impulsions. Différents paramètres tels que lamplitude de modulation, la fréquence de modulation, les caractéristiques spectrales des filtres et lamplitude globale des impulsions mères peuvent être régulés pour obtenir une plus grande polyvalence et adaptabilité.

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