Electrostriction forces during laser ablation have been studied both theoretically and experimentally. The components of electroctrostriction force for inhomogeneous electromagnetic field near a substrate were proposed to be taken similarly to those in gases within nonresonant spectral region. Nonzero Lorentz force in standing light wave was found to be responsible for different morphology of the nanostructured surface as compared to etching the transient substrate. Our experiments were performed using the femtosecond laser focused on polished glass and Al-coated glass surfaces. The treated surfaces were studied using atomic force microscopy with the spatial resolution of 30 nm. Nanoscale patterning of the etched surface spots was explained in the frames of theoretical modeling. Possible spatial locations of electrostriction force components in the Gauss profile laser beam have been also discussed.

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