Antisymmetric Distribution of Permanent Refractive Index Change in β-BaB2O4 Crystal Under Exposure of Femtosecond Pulses.
1 Fiber Optics Research Center of RAS, 38 Vavilova Street, Moscow 119333, Russia
2 Bauman Moscow State Technical University, 5 2-nd Bauman Street, Moscow, 107005, Russia
3 Sobolev Institute of Geology and Minerology of SB RAS, 3 Acad. Koptyugina Ave. Novosibirsk 630090, Russia
4 Aston University, Aston Triangle, Birmingham, B4 7ET, UK
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We have observed unusual asymmetrical refractive index change as a result of femtosecond laser inscription in a crystal without center of inversion. Profile of the refractive index change exhibits sign turn within the domain of femtosecond pulse exposure.
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