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2 December 2022 Conical third harmonic generation from high repetition rate filamentation-induced bulk damage in transparent materials
Robertas Grigutis, Vytautas Jukna, Gintaras Tamošauskas, Marius Navickas, Kestutis Staliunas, Audrius Dubietis
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Proceedings Volume PC12300, Laser-Induced Damage in Optical Materials 2022; PC123000M (2022) https://doi.org/10.1117/12.2642528
Event: SPIE Laser Damage, 2022, Rochester, New York, United States
Abstract
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.
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Robertas Grigutis, Vytautas Jukna, Gintaras Tamošauskas, Marius Navickas, Kestutis Staliunas, and Audrius Dubietis "Conical third harmonic generation from high repetition rate filamentation-induced bulk damage in transparent materials", Proc. SPIE PC12300, Laser-Induced Damage in Optical Materials 2022, PC123000M (2 December 2022); https://doi.org/10.1117/12.2642528
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KEYWORDS
Harmonic generation
Femtosecond phenomena
Nonlinear optics
Supercontinuum generation
Optical damage
Ultrafast phenomena
Glasses
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