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

被引：30

作者：

Ahmed, Farid ^{[1
]}

Ahsan, M. Shamim ^{[2
]}

Lee, Man Seop ^{[2
]}

Jun, Martin B. G. ^{[1
]}

机构：

[1] Univ Victoria, Dept Mech Engn, Lab Adv Multiscale Mfg, STN CSC, Victoria, BC V8W 3P6, Canada

[2] Korea Adv Inst Sci & Technol, Photon Applicat Lab, Taejon 305701, South Korea

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2014年 / 114卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PROPAGATION; SILICA;

D O I：

10.1007/s00339-013-7705-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：1161 / 1165

页数：5

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