Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1991991
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Femtosecond laser radiation tightly focused in bulk fused silica is used to generate self-ordered nanogratings when the sample is translated under the lens at constant speed. The nanogratings are preserved over a length scale of millimeters. We demonstrate that nanogratings are formed for all pulse durations tested, ranging from 40 to 500 fs, and that the pulse energy threshold for this phenomenon increases with decreasing pulse duration. We use high spatial resolution diagnostics based upon selective chemical etching followed by atomic force microscopy and scanning electron microscopy to reveal the morphology of the nanogratings. (c) 2005 American Institute of Physics.
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