Abstract
Using trains of femtosecond (fs) laser pulses focused inside the bulk of a dielectric material to produce a permanent modification is a powerful technique. Due to a low heat diffusion coefficient of the matter, the laser energy may be accumulated in the absorption region. The material can be heated to very high temperatures even if the single pulse energy is too low to induce a significant material modification. Then, by adjusting the number of incident laser pulses, it is possible to control the amount of laser energy deposited into the material with a great accuracy.
© 2015 IEEE
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