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Transillumination images of the exit face (upper row) and near-field images (lower row) obtained in three laser-written waveguides in K10 glass. The pulse energy used during the writing process is included in each image pair.
MicroRaman spectrum obtained in the guiding region of a waveguide written at 3.5 μJ (a), and spectra obtained in the nonguiding and guiding regions of a waveguide written at 105 μJ (b). Spectra obtained in a nonirradiated region are included. All spectra are normalized to its maximum value and are vertically shifted for sake of clarity. The arrow indicates the peak.
Laser scanning transillumination images (upper row) and nonlinear fluorescence images (lower row) of the exit face obtained in two representative fs laser-written waveguides. The pulse energy used during the writing process is included in each image pair.
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