Near-field modification of femtosecond laser beam to enhance single-shot pulse filamentation in glass medium |
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Authors: | Farid Ahmed M. Shamim Ahsan Man Seop Lee Martin B. G. Jun |
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Affiliation: | 1. Laboratory for Advanced Multi-scale Manufacturing, Department of Mechanical Engineering, University of Victoria, PO Box 3055, STN CSC, Victoria, British Columbia, V8W 3P6, Canada 2. Photonics Application Lab., Korea Advanced Institute of Science and Technology, 335 Gwahak-ro, Yuseong-gu, Daejeon, 305-701, South Korea
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Abstract: | 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 Eagle2000 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 μm is observed to propagate as long as 700 μm in Corning Eagle2000 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. |
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