Formation of photoinduced space-charge field during in-bulk domain creation by femtosecond NIR laser irradiation in MgO:LN crystals
This study investigates the formation and thermal stability of photoinduced space-charge fields during femtosecond NIR laser irradiation of MgO:LN crystals, revealing that while refractive index modifications vanish upon annealing due to bulk screening, the resulting microtracks and domain structures persist, offering a pathway for 3D nonlinear photonic crystal engineering.