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Phys Rev Lett. 2008 Dec 12;101(24):243001. Epub 2008 Dec 8.

Orientation-dependent multiphoton ionization in wide band gap crystals.

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University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5.


Using different crystalline dielectrics and intense femtosecond laser pulses, we show that nonlinear absorption depends on sample orientation. This arises primarily because of the direction dependence of the effective mass of the electron. The multiphoton nature of the interaction creates a local probe that can be used anywhere in the material. We show that the structure of crystal quartz is not changed by repeated illumination of the focal region with 45 fs pulses.

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