Patent ID: 7525894

Claim:
Optical information recording apparatus comprising: recording reference beam irradiation means for irradiating a recording reference beam onto an optical information recording medium; information beam irradiation means for irradiating an information beam carrying information onto a first surface of said optical information recording medium; reflection means for reflecting only said information beam passing through said optical information recording medium onto said optical information recording medium, said reflection means arranged externally to said optical information recording medium and on a second surface opposite to the first surface of said optical information recording medium, said recording reference beam irradiation means not irradiating said recording reference beam onto said reflection means; polarization control means between said optical information recording medium and said reflection means for matching a polarization direction of said information beam with a polarization direction of said recording reference beam; and recording means for recording onto said optical information recording medium an interference pattern generated by interference of said recording reference beam irradiated by said recording reference beam irradiation means and said information beam irradiated by said reflection means.