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(Color online) Interferometrically measured refractive index profile after illumination of a crystal with femtosecond light pulses of wavelength. The pulses are incident normally onto the face of the the crystal.
Cut through the profile for ordinary and extraordinary recording polarization. The inset shows the resulting profile by using a light stripe instead of a circular beam.
Buildup of the refractive index changes for the minimum and the wings of the profile (Fig. 2). The inset shows the intensity dependence of refractive index changes of the minimum of the profile. The solid line is a calculated curve for a three-photon process.
(Color online) From an expanded dipole charge distribution (left) calculated profile (right). The charge density results from a 2D simulation for an illumination with a Gaussian intensity profile and bulk photovoltaic charge transport.
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