Laser chirp effect on femtosecond laser filamentation generated for pulse compression.
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.
Dept. of Physics and Coherent X-ray Research Center, KAIST, Daejeon 305-701, Korea. juyuni@kaist.ac.kr
Juyun
J
Park
Jae-Hwan
JH
Lee
Chang H
CH
Nam
D044962:Data Compression / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*