Patent ID: 8298726

Claim:
A volume phase hologram recording material which comprises mainly containing (a) a three-dimensional crosslinked polymer matrix, (b) a photoradically polymerizable monomer, and (c) a photopolymerization initiator wherein the three-dimensional crosslinked polymer matrix (a) has photoradically polymerizable groups and is formed from a polymer matrix-forming material (A) containing 0.5-40 wt % of a matrix-forming compound having photoradically polymerizable groups (a1) and a matrix-forming compound having no photoradically polymerizable group (a2) and the aforementioned matrix-forming compound having photoradically polymerizable groups (a1) is represented by the following formula (1): in formula (1), Ar is a divalent group having one or more aromatic rings, R 1 and R 2 each is independently a hydrogen atom or a methyl group, L 1 is an oxygen atom, a sulfur atom, or —(OR 3 ) n O—, R 3 is an alkylene group, n is an integer of 1-4, and L 2 is a divalent group optionally having aromatic rings wherein the photoradically polymerizable groups to be introduced to the three-dimensional crosslinked polymer matrix is in a concentration of 0.01-0.2 mol/kg of the whole polymer matrix-forming material (A).