Optical information recording medium

An optical recording medium comprising:

• a substrate comprising an organic substance with at least one maximum absorption peak in each of a range from 600 to 800 nm and a range from 300 to 400 nm, the substrate comprising a groove that comprises a track pitch of from 200 to 400 nm, a groove depth of from 50 to 150 nm and a groove half-value width of from 90 to 200 nm;
• a reflective layer on the substrate;
• and
• a recording layer on the reflective layer, wherein the medium is recordable and replayable using laser light comprising a wavelength of 450 nm or less and an objective lens comprising an aperture NA that is at least 0.5 and less than 0.7.

An optical information recording medium comprising:

• a substrate comprising a groove depth of from 15 to 45 nm, a track pitch of from 250 to 400 nm, a groove half-value width of from 60 to 200 nm and a groove tilt angle of from 40° to 80°;
• a reflective layer on the substrate;
• a recording layer comprising an organic substance on the reflective layer, at which recording layer information is recordable and replayable by irradiating laser light comprising a wavelength of from 380 to 500 nm through a lens comprising an aperture NA of 0.7 or more;
• and
• a sheet layer on the recording layer.