Near-field modification of femtosecond laser beam to enhance single-shot pulse filamentation in glass medium

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In this paper, a study of the effect of a transparent dielectric medium (soda-lime glass placed after an objective lens) on femtosecond pulse filamentation in Corning Eagle(2000) glass is presented. The dielectric medium placed after the objective lens increases the effective numerical aperture of the focusing lens and tightly focuses the beam to elevate the power density in a tiny focal volume. A single-shot narrow filamentary void of diameter 3.8 mu m is observed to propagate as long as 700 mu m in Corning Eagle(2000) glass. Elevated optical intensity confined in the small focal volume and low ionization losses per unit length in the narrow plasma column collectively enhance the filamentary propagation of the ultra-short pulse in bulk glass. The applied technique also offers an approach to control the length and width of a filamentary void structure in a transparent dielectric medium.
Publisher
SPRINGER
Issue Date
2014-03
Language
English
Article Type
Article
Keywords

PROPAGATION; SILICA

Citation

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.114, no.4, pp.1161 - 1165

ISSN
0947-8396
DOI
10.1007/s00339-013-7705-4
URI
http://hdl.handle.net/10203/187185
Appears in Collection
EE-Journal Papers(저널논문)
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