Hologram recording medium and optical element comprising the same

A hologram recording medium comprising:

• a photopolymer layer which includes a polymer matrix formed by crosslinking a siloxane-based polymer containing a silane functional group and a (meth)acrylic-based polyol, or a precursor thereof;
• a photoreactive monomer and a photoinitiator system or a photopolymer obtained therefrom;
• and a fluorinated compound,
• wherein a refractive index variation calculated by the following Equation 4 is 1.0% or less, and
• wherein a haze is 2% or less:
• Refractive
• ⁢
• index
• ⁢
• variation
• ⁢
• (
• %
• )
• =
• {
• ❘
• "\[LeftBracketingBar]"
• 1
• -
• n
• 1
• /
• n
• 0
• }
• ×
• 100
• [
• Equation
• ⁢
• 4
• ]
• wherein, in the Equation 4, n0 is a refractive index of a sample in which the hologram recording medium before recording is stored at a temperature of 20 to 25° C. and a relative humidity of 40 to 50% and then bleached with a white LED, and n1 is a refractive index of a sample in which the hologram recording medium before recording is stored at a temperature of 60° C. and a relative humidity of 90% for 72 hours and then bleached with a white LED.