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Side view optical microscopy images of features produced in bulk materials at increasing depths by single 30 fs laser pulses focused at 0.45-NA in: (a) gelatine, 200 nJ, (b) gelatine, 300 nJ, (c) gelatine, 400 nJ, (e) PVP, 500 nJ, (f) PVP, 2500 nJ, (g) PVP-chitosan (PVP-Cs) blend, 500 nJ and (h) PVP-chitosan blend, 2500 nJ. The picture in (d) is an enlarged view of a single feature in (a). The laser beam is incident from the top of the figures.
Evolution of the number of features with pulse energy created inside the bulk of PVP and PVP-chitosan blend by single 30 fs laser pulses focused at 0.45-NA.
Biopolymer and polymer parameters and focusing conditions for laser irradiation at 800 nm, 30 fs, 0.45-NA.
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