| 摘要 |
A photopolymer medium 10 for color hologram image recording, which is formed so that a color image having a high diffraction efficiency can be obtained by exposing the same recording layer to light at a plurality of wavelengths, includes a recording layer 14 that has a recording sensitivity to light in two wavelength regions of a wavelengthλ1 and a wavelengthλ2. This recording layer 14 is formed from a material in which a transmittance T1 of light at the wavelengthλ1 and a transmittance T2 of light at the wavelengthλ2 of the recording layer before recording are both less than 80%, T1<T2 is satisfied, a transmittance T1after of light at the wavelengthλ1 after recording has been performed with light at only the wavelengthλ2 satisfies T1after>T1, and 10%<T1after<80%.
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