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

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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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Acknowledgements

The authors gratefully acknowledge the financial support from NSERC Discovery and CFI Canada. We would also like to acknowledge the support of Brain Korea 21 Project, South Korea.

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Authors and Affiliations

  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

    Farid Ahmed & Martin B. G. Jun

  2. Photonics Application Lab., Korea Advanced Institute of Science and Technology, 335 Gwahak-ro, Yuseong-gu, Daejeon, 305-701, South Korea

    M. Shamim Ahsan & Man Seop Lee

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  1. Farid Ahmed
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  2. M. Shamim Ahsan
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  3. Man Seop Lee
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  4. Martin B. G. Jun
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Correspondence to Martin B. G. Jun.

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Ahmed, F., Shamim Ahsan, M., Seop Lee, M. et al. Near-field modification of femtosecond laser beam to enhance single-shot pulse filamentation in glass medium. Appl. Phys. A 114, 1161–1165 (2014). https://doi.org/10.1007/s00339-013-7705-4

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  • DOI: https://doi.org/10.1007/s00339-013-7705-4

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