3-d holographic recording method and 3-d holographic recording system

Abstract

A method of 3D holographic recording by using a very simple optical system comprises: dividing a femto-second laser pulse into a plurality of light beams by a diffraction beam splitter ( 3 ), focusing four light beams selected from the divided plurality of light beam, and further focusing these four light beams into a sample ( 7 ) comprised of a photosensitive material capable of multi-photon exposure so that the photosensitive material is exposed to the interference among the four light beams and multi-photon absorption in the sample ( 7 ) is induced, thus recording a 3D phase hologram on the irradiated portion of the sample ( 7 ).

1 . A method of 3D holographic recording comprising: dividing a femto-second laser pulse into a plurality of light beams, focusing the divided plurality of light beams in the parallel direction, selecting four light beams, and further focusing these four light beams into a photosensitive material capable of multi-photon exposure so that the photosensitive material is exposed to the interference among the four light beams and multi-photon absorption in the photosensitive material is induced, thus recording a 3D phase hologram on the irradiated portion of the photosensitive material.  
   
   
       2 . The method of 3D holographic recording as claimed in  claim 1 , wherein the phase hologram recorded on the irradiated portion of the photosensitive material is a Bragg diffraction lattice.  
   
   
       3 . The method of 3D holographic recording as claimed in  claim 2 , wherein the formed Bragg diffraction lattice is used as a photonic crystal.  
   
   
       4 . The method of 3D holographic recording as claimed in  claim 1 , wherein the photosensitive material capable of multi-photon exposure is glass that undergoes photo/thermo-induced refractive index change.  
   
   
       5 . The method of 3D holographic recording as claimed in  claim 4 , wherein the glass that undergoes photo/thermo-induced refractive index change is glass having a composition close to 15Na 2 O-5ZnO-4Al 2 O 3 -70SiO 2 -5NaF-0.01Ag 2 -0.01CeO 2 .  
   
   
       6 . A 3D holographic recording system for performing the holographic recording method as claimed in  1 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       7 . The 3D holographic recording system as claimed in  claim 6 , wherein one of the two lenses is an achromatic lens for focusing the plurality of light beams divided by the diffraction beam splitter into parallel directions, and another is an objective lens of a microscope for focusing the four light beams selected by the aperture on a photosensitive material, exposing the material to the interference among the beams.  
   
   
       8 . The method of 3D holographic recording as claimed in  claim 2 , wherein the photosensitive material capable of multi-photon exposure is glass that undergoes photo/thermo-induced refractive index change.  
   
   
       9 . The method of 3D holographic recording as claimed in  claim 3 , wherein the photosensitive material capable of multi-photon exposure is glass that undergoes photo/thermo-induced refractive index change.  
   
   
       10 . The method of 3D holographic recording as claimed in  claim 8 , wherein the glass that undergoes photo/thermo-induced refractive index change is glass having a composition close to 15Na 2 O-5ZnO-4Al 2 O 3 -70SiO 2 -5NaF-0.01Ag 2 O-0.01CeO 2 .  
   
   
       11 . The method of 3D holographic recording as claimed in  claim 9 , wherein the glass that undergoes photo/thermo-induced refractive index change is glass having a composition close to 15Na 2 O-5ZnO-4Al 2 O 3 -70SiO 2 -5NaF-0.01Ag 2 O-0.01CeO 2 .  
   
   
       12 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 2 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       13 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 3 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       14 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 4 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       15 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 8 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       16 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 9 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       17 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 5 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       18 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 10 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       19 . A 3D holographic recording system for performing the holographic recording method as claimed in  claim 11 , comprising: 
 1) a laser light source for generating femto-second laser pulses,    2) a diffraction beam splitter for dividing a femto-second laser pulse into a plurality of light beams,    3) two lenses for focusing the divided femto-second laser pulses, and    4) an aperture for selecting four light beams from among the divided femto-second laser pulses.    
   
   
       20 . The 3D holographic recording system as claimed in  claim 12 , wherein one of the two lenses is an achromatic lens for focusing the plurality of light beams divided by the diffraction beam splitter into parallel directions, and another is an objective lens of a microscope for focusing the four light beams selected by the aperture on a photosensitive material, exposing the material to the interference among the beams.