NDLI: Frequency chirp and pulse width control of internal modification of transparent material using tailored femtosecond laser pulse

Content Provider	IEEE Xplore Digital Library
Author	Imahoko, T. Obara, M.
Copyright Year	2001
Description	Author affiliation: Fac. of Sci. & Technol., Keio Univ., Yokohama, Japan (Imahoko, T.)
Abstract	To experimentally investigate the frequency-chirp- and pulse-width-dependent modification of silica glass, we use the chirped pulse amplification (CPA) system with the femtosecond automatic pulse compressor. When a high-intensity laser pulse is focused into silica glass, laser-induced solid-density plasma and small-scale filaments are produced at an intensity of 1 TW/cm/sup 2/ approximately. The solid-density plasma formation is due to both mechanisms of self-focusing due to the intensity-dependent refractive index change and of self-defocusing by laser-induced plasma. The other nonlinear phenomena in which ultrashort laser propagating in a silica glass, are self-phase modulation (SPM), self-channeled plasma formation, and permanent bulk modification. All processes are also strongly dependent on the input intensity, pulse width and chirp. Although detailed simulations of femtosecond pulse propagation are difficult tasks we simulate pulse propagation with different input pulse parameters (Fourier transform limited, down-/up-chirped pulse). We consider, here, only the SPM and material dispersion in silica glass and use the split step Fourier method. It is clearly seen that the pulse-profile is less stretched using an optimal chirped pulse as the input pulse. In addition, longer Fourier transform-limited pulses are less stretched after propagation.
Starting Page	304
Ending Page	305
File Size	124289
Page Count	2
File Format	PDF
ISBN	0780371054
ISSN	10928081
DOI	10.1109/LEOS.2001.969296
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Chirp Space vector pulse width modulation Pulse amplifiers Silicon compounds Glass Pulse compression methods Solid lasers Optical propagation Plasmas
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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