Optical recording/reproducing device

An optical reproducing apparatus for reproducing standing wave information from a recording medium having an index of refraction that varies in accordance with the intensity of a light beam and having the information recorded therein using standing waves, characterized in that the standing waves are recorded in the recording medium in a multilayer structure by emitting, from an optical head, two separate laser beams generated by separating a laser beam emitted from a light source into a plurality of separate laser beams so that a focal position of one of the two laser beams reaching a reflecting surface of the recording medium is the same as a focal position of the other laser beam after returning from the reflecting surface, and the information formed from the standing waves is read out from the reflecting surface by emitting either one of the two laser beams.

An optical recording and reproducing apparatus for recording information on a recording medium having an index of refraction that varies in accordance with the intensity of a light beam using standing waves and reproducing the standing wave information from the recording medium, characterized in that it comprises:

• an optical head configured to emit, using an objective lens, two separate laser beams generated by separating a laser beam emitted from a light source into a plurality of separate laser beams so that a focal position of one of the two laser beams reaching a reflecting surface of the recording medium is the same as a focal position of the other laser beam after returning from the reflecting surface;
• wherein the standing waves are recorded inside the recording medium in a multilayer structure using the two laser beams emitted so as to have the same focal position by the optical head, and wherein the information in the form of standing waves output from the reflecting surface is read out by emitting either one of the two laser beams.

An optical recording method for recording information on a recording medium having an index of refraction that varies in accordance with the intensity of a light beam using standing waves, characterized in that the standing waves are recorded inside the recording medium in a multilayer structure by emitting, using an objective lens, two separate laser beams generated by separating a laser beam emitted from a light source into a plurality of separate laser beams so that a focal position of one of the two laser beams reaching a reflecting surface of the recording medium is the same as a focal position of the other laser beam after returning from the reflecting surface.

An optical reproducing apparatus for reproducing standing wave information from a recording medium having an index of refraction that varies in accordance with the intensity of a light beam and having the information recorded therein using standing waves, characterized in that the standing waves are recorded in the recording medium in a multilayer structure by emitting, from an optical head, two separate laser beams generated by separating a laser beam emitted from a light source into a plurality of separate laser beams so that a focal position of one of the two laser beams reaching a reflecting surface of the recording medium is the same as a focal position of the other laser beam after returning from the reflecting surface, and the information formed from the standing waves is read out from the reflecting surface by emitting either one of the two laser beams.

A recording medium having an index of refraction that varies in accordance with the intensity of a light beam and having information recorded therein using standing waves, characterized in that the standing waves are recorded in the recording medium in a multilayer structure by emitting, from an optical head, two separate laser beams generated by separating a laser beam emitted from a light source into a plurality of separate laser beams so that a focal position of one of the two laser beams reaching a reflecting surface of the recording medium is the same as a focal position of the other laser beam after returning from the reflecting surface.