  Theoretical and experimental evidence of light driven structuring of glasses
is presented. We show that light overcomes Coulomb repulsion and effective
electron-electron interaction in glasses under strong light pumping becomes
attractive. As the result homogenious distribution of trapped electrons gets
unstable and macroscopic electron bunches are grown. At different conditions
ordered structures with period about 2 microns determined by internal
properties of the material are formed These structures were observed in
ablation: surface profile after laser treatment reveals ordered pattern
corresponding to the light induced electron domains.
