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We show experimental evidence for cold avalanche and demonstrate how it can be distinguished from the traditional avalanche process. We analyse the nonlinear absorption of 800 nm, ultrashort pulses focused inside fused silica glass to study the ionization mechanisms. The light is focused tightly inside the glass using a microscope objective so as to avoid surface damage and self phase modulation....
Using the unique characteristics of multiphoton ionization with focused femtosecond pulses, we report on a pump and probe metrology to analyze carrier dynamics inside dielectrics. We characterize the sub-picosecond trapping of carriers inside fused SiO2.
By repeated optical breakdown with focused femtosecond pulses, we decrease the refractive index of fused silica by few percent. The subsequent micro-lens formation is associated with a reduction of multiphoton absorption in all dielectrics.
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