Abstract
The filamentation of femtosecond laser pulses and filament-induced self-writing of a permanent waveguide are observed in As4Ge30S66 chalcogenide glass. The radial profile of the self-written waveguide is extracted from the defocused transmission microscopic images via a two-step procedure: at first the phase image of the waveguide is computed using the transport-of-intensity equation and then the index profile is obtained from the phase image by applying the inversed Abel transform.
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Blonskyi, I., Kadan, V., Shpotyuk, O. et al. Filament-induced self-written waveguides in glassy As4Ge30S66 . Appl. Phys. B 104, 951–956 (2011). https://doi.org/10.1007/s00340-011-4390-x
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DOI: https://doi.org/10.1007/s00340-011-4390-x