Tightly focused NIR femtosecond laser irradiation in MgO:LN generates a photovoltaic-driven space-charge field that forms lens-shaped refractive-index modifications around laser-induced microtracks and domains; these lenses disappear on annealing due to bulk screening while domains persist.
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A poling-free SPDC design based on modal phase-matching via mode conversion is proposed for 4H-SiC and thin-film LiNbO3.
A modal phase-matching scheme using TM20-to-TE00 mode conversion enables poling-free SPDC in 4H-SiC and lithium niobate on-insulator waveguides with simulated conversion efficiencies of 96-99%.
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Formation of photoinduced space-charge field during in-bulk domain creation by femtosecond NIR laser irradiation in MgO:LN crystals
Tightly focused NIR femtosecond laser irradiation in MgO:LN generates a photovoltaic-driven space-charge field that forms lens-shaped refractive-index modifications around laser-induced microtracks and domains; these lenses disappear on annealing due to bulk screening while domains persist.