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Damage threshold of crystals SiO 2 and YAG against 60–900fs, 800nm laser pulses are reported. The breakdown mechanisms were discussed based on the double-flux model and Keldysh theory. We found that impact ionization plays the important role in the femtosecond laser-induced damage in crystalline SiO 2 , while the roles of photoionization and impact ionization in YAG crystals depend...
We report the single-shot damage thresholds of MgF 2 /ZnS omnidirectional reflector for laser pulse durations from 50fs to 900fs. A coupled dynamic model is applied to study the damage mechanisms, in which we consider not only the electronic excitation of the material, but also the influence of this excitation-induced changes in the complex refractive index of material on the laser pulse itself...
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