RECORDING/REPRODUCING DEVICE, RECORDING/REPRODUCING METHOD AND INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To realize stable recording and reproducing in/from an information recording medium by utilizing an absorption edge shift phenomenon.SOLUTION: An optical information recording/reproducing device 100 comprises: a light source 20 for emitting a laser beam; a lens 6 for condensing the laser beam on an information recording medium 21; and a photodetector 19 for detecting reflection light from the information recording medium 21. A recording layer of the information recording medium 21 contains a material in which an absorption ratio of the laser beam is increased by an absorption edge of an optical absorption spectrum being moved to a longer wavelength due to band-to-band transition of electrons as a temperature is increased. The optical information recording/reproducing device 100 further comprises: a wavelength detection section 26 for detecting at least one of a wavelength of the laser beam and wavelength variations; a temperature detection section 27 for detecting at least one of a temperature of the information recording medium 21 or around the information recording medium 21 and temperature variations; and a control section 28 for controlling power of the light source 20 on the basis of respective outputs of the wavelength detection section 26 and the temperature detection section 27.