We show that high repetition rate supercontinuum generation in solids is accompanied by the emission of conical third harmonic, whose occurrence serves as straightforward indication of the onset of in-bulk optical damage at its early stage. It is shown that conical third harmonic generation obeys noncollinear phase matching condition, which involves reciprocal lattice vector of a nanograting inscribed by femtosecond filament in the volume of transparent material. The universality of phenomenon is justified by the experiments in various transparent crystals and glasses and under various settings of focusing condition, pulse energy, repetition rate, exposure time and laser wavelength.
Laser 3D nanolithography as an additive manufacturing technology allows the fabrication of various objects at a micro-scale, with possible nano-scale single features. An absorption mechanism plays the key role, thus polymerization reaction starts only at a certain value of light intensity I, which also alters because of possible different non-linearities of light-matter interaction when different wavelengths are used. Both polymerization and optical damage thresholds and the feature size depend on the applied I and energy dose E. In this work, the experiment was performed within the 700-1250 nm wavelength range while varying pulse duration (~ 100-300 fs). We present how the polymerization process (thresholds and feature sizes) depends on both wavelength and pulse duration in the SZ2080TM prepolymer.
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