Abstract

The absorption of light by a crystal is critically influenced by the symmetry of its lattice [1]. Crystal symmetry usually defines the optical properties [2], the band structure of the sample, along with a number of other mechanical and thermal properties. However, the modification of crystals by ultrashort laser pulses routinely employs intensities of the order of 10¹⁴ W/cm². At such high intensity, the band structure of the material can be modified by various phenomena such as laser-dressing [3], band-gap renormalization and structural modifications (e.g., phase modification and defect incubation).

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