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The initial stage of the small-scale ionization-induced instabilitydeveloping inside the fused silica volume exposed to the femtosecond laserpulse is studied as a possible initial cause of the self-organized nanogratingformation. We have calculated the spatial spectra of the instability with theelectron-hole diffusion taken into account for the first time and have foundthat it results in the formation of some hybrid (diffusion-wave) 1D structurewith the spatial period determined as geometrical mean of the laser wavelengthand characteristic diffusion length of the process considered. Near thethreshold of the instability this period occurs to be approximately equal tothe laser half-wavelength in the silica, close to the one experimentallyobserved.

Volume nanograting formation in laser-silica interaction as a result of the 1D plasma-resonance ionization instability