We presented a microfabrication process for optical volume vortex grating inside glass by femtosecond laser pulses. The self-trapped filament of femtosecond laser pulses can induce hundreds pm-long region refractive-index changes in glass. We realized the restructured optical vortex beams using a collimated He-Ne laser beam. The maximum first-order diffraction efficiency was about 19.6%. The volume vortex grating structure fabricated in glass is polarization dependent. (C) 2009 Elsevier B.V. All rights reserved.