Open AccessLaser chirp effect on femtosecond laser filamentation generated for pulse compression
Author(s) -
Juyun Park,
JaeHwan Lee,
Chang Hee Nam
Publication year - 2008
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.16.004465
Subject(s) - filamentation , chirp , femtosecond , optics , laser , materials science , protein filament , pulse compression , femtosecond pulse shaping , chirped pulse amplification , physics , telecommunications , radar , computer science , composite material
The influence of laser chirp on the formation of femtosecond laser filamentation in Ar was investigated for the generation of few-cycle high-power laser pulses. The condition for the formation of a single filament has been carefully examined using 28-fs laser pulses with energy over 3 mJ. The filament formation and output spectrum changed very sensitively to the initial laser chirp and gas pressure. Much larger spectral broadening was obtained with positively chirped pulses, compared to the case of negatively chirped pulses that generated much longer filament, and compressed pulses of 5.5 fs with energy of 0.5 mJ were obtained from the filamentation of positively chirped 30-fs laser pulses in a single Ar cell.