Optical recording device and optical recording and reproduction device

An optical recording and reproduction device comprising:

• a light source that emits coherent light;
• a spatial light modulator that is formed from a plurality of pixels that are two-dimensionally arrayed, that comprises a signal light region that displays a signal light pattern when generating signal light, and a reference light region that is disposed so as to surround the signal light region and displays a reference light pattern when generating reference light that is coaxial with the signal light, and that modulates and outputs incident light for each pixel in accordance with a display pattern;
• a diaphragm mechanism that is disposed between the light source and the spatial light modulator and comprises an opening portion whose diameter contracts during reproduction to restrict the beam diameter of the light that passes therethrough;
• a correcting optical system that is disposed between the diaphragm mechanism and the spatial light modulator, that comprises a pair of axicon lenses that are disposed such that conical surfaces thereof face each other, and which, during recording, corrects the light that has passed through the opening portion in the diaphragm mechanism so as to flatten the light intensity distribution thereof on an irradiated surface of the spatial light modulator and, during reproduction, corrects the light that has passed through the opening portion in the diaphragm mechanism such that a region other than the signal light region of the spatial light modulator is irradiated therewith;
• and
• a light guiding section that guides the light that has been corrected by the correcting optical system to the spatial light modulator,
• wherein, during recording, the signal light and the reference light generated by the spatial light modulator are irradiated onto an optical recording medium and a hologram is recorded into the optical recording medium, and
• during reproduction, the reference light generated by the spatial light modulator is irradiated onto the optical recording medium on which the hologram has been recorded, and the signal light is reproduced.