For efficient fabrication of three-dimensional modification structures in transparent materials, the variation of nonlinear phenomena, i.e., plasma formation and modification by the n-th order multiphoton absorption, must be determined. In our experiment, a multimode optical fiber was used, which enabled us to study the process of plasma formation simultaneously at various input intensities, instead of bulk material. In this paper, we report the first experimental observation of three photon and six photon absorption process for self-channeling and bulk modification in multimode optical fibers during excitation by a high-intensity femtosecond Ti:sapphire laser.


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    Title :

    Multiphoton absorption of self-channeling and bulk modification in optical fibers using a high intensity femtosecond laser


    Contributors:
    Sung-Hak Cho (author) / Kumagai, H. (author) / Midorikawa, K. (author) / Obara, M. (author)


    Publication date :

    1998-01-01


    Size :

    240991 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Multiphoton Absorption of Self-Channeling and Bulk Modification in Optical Fibers Using a High Intensity Femtosecond Laser

    IEEE; Lasers and Electro-Optics Society | British Library Conference Proceedings | 1998



    Fabrication of Multi-Core Structures in Optical Fibers Using Plasma Self-Channeling Excited by a Femtosecond Laser

    Cho, S.-H. / Kumagai, H. / Midorikawa, K. et al. | British Library Conference Proceedings | 2001