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9 March 2016 Few-cycle pulses for bulk micro-machining of fused silica
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The potential of few-cycle pulses for bulk microprocessing of fused silica in tight focusing conditions is explored. Few-cycle pulses emitted from a non-collinear optical parametric amplifier (NOPA) delivering sub-7 fs laser pulses at a repetition rate of 400 kHz with a pulse energy up to 10 μJ are focused in the bulk of fused silica sample. The focusing apparatus is a high numerical aperture (NA = 0.5), all-reflective microscope objective. The characterization of the photoinduced microstructures in spatial light interference microscopy reveals that few-cycle pulses offer an unprecedented flexibility for producing Type I structures, characterized by a uniform refractive index (higher than the refractive index of the pristine bulk) and the absence of damage in the vicinity of the microprocessing region.
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A. Mermillod-Blondin, B. Klessen, F. J. A. Furch, and M. J. J. Vrakking "Few-cycle pulses for bulk micro-machining of fused silica", Proc. SPIE 9740, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVI, 97401B (9 March 2016);

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