Photosensitive composition for volume hologram recording and photosensitive medium for volume hologram recording

A photosensitive composition for volume hologram recording comprising:

• a partially or fully hydrolyzed polycondensate of the following Substances A and B:
• Substance A:
• an organic-inorganic hybrid polymer, its partially hydrolyzed polyconsdensate, or a combination thereof,
• Substance B:
• an organometallic compound represented by the following general formula 2;
• a photopolymerization reactive compound;
• and
• a photopolymerization initiator,
• wherein said organic-inorganic hybrid polymer is obtainable by copolymerizing at least an organometallic compound represented by the following general formula 1 and a monomer having an ethylenically unsaturated bonding:
• R1mM1(OR2)n General formula 1
• wherein M1 represents a metallic atom, R1 may be identical or different and represents a group having an ethylenically unsaturated bonding and containing 1-10 carbon atoms, R2 may be identical or different and is alkyl group containing 1-10 carbon atoms, m+n represents the number of valence of metal M1, m≧1 and n≦1,
• M2R3n′ General formula 2
• wherein M2 represents a metallic atom, R3 may be identical or different and is a halogen, an alkyl group, alkoxyl group or acyloxy group containing 10 carbon atoms or less respectively or hydroxyl group, all or portion of these groups may be replaced with chelate ligand, and n′ represents the number of valence of metal M2.