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Article Abstract
In this study, we systematically investigated the relationship between the F/O ratio and the nonlinear refractive index of fluorophosphate glass, revealing that the nonlinear refractive index decreased exponentially as the F/O ratio increased. A formula for calculating the nonlinear refractive index based on the composition of fluorophosphate glasses was proposed. Since the nonlinear refractive index is directly related to self-focusing damage, we demonstrated through femtosecond laser-induced damage experiments that the F/O ratio can effectively modulate the self-focusing damage properties of fluorophosphate glass. Additionally, time-resolved pump-probe experiments were employed to capture the damage process and explore the damage mechanisms.
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