Photosensitive composition for forming volume hologram recording layer

A photosensitive composition for volume hologram recording layer formation, the photosensitive composition comprising following components:

• (A) at least one cationically polymerizable compound comprising a compound represented by Formula (1);
• (B) a compound comprising an active-proton-containing functional group;
• (C) a thermal acid generator;
• (D) a radically polymerizable compound;
• and
• (E) a radical-polymerization initiator,
• Components (A), (B), and (C) constituting a precursor material for three-dimensional cross-linked polymer matrix,
• Components (A), (B), and (C) being present in the precursor material for three-dimensional cross-linked polymer matrix in such proportions that a molar ratio of the active-proton-containing functional group of Component (B) to cycloaliphatic epoxy groups of the compound represented by Foimula (1) in Component (A) is from 0.01 to 0.3,
• Formula (1) being expressed as follows:
• wherein n represents an integer from 0 to 10;
• X represents, independently in each occurrence, one divalent group selected from the group consisting of oxygen, —CH2—, —C(CH3)2—, —CBr2—, —C(CBr3)2—, —CF2—, —C(CF3)2—, —CCl2—, —C(CCl3)2—, and —CH(C6H5)—, where, when n is 2 or more, two or more occurrences of X may be identical or different;
• R1 to R18 are each, identically or differently, selected from hydrogen, halogen, a hydrocarbon group optionally comprising oxygen or halogen, and optionally substituted alkoxy.