Patent ID: 8659982

Claim:
An optical information recording/reproducing apparatus in which two optical beams face each other and are focused at substantially the same place of an optical information recording medium to record a standing wave developed by interference of the two optical beams, the apparatus comprising: an electric field complex amplitude modulation unit configured to modulate an electric field complex amplitude of at least one of the two optical beams; a first optical path length adjustment unit configured to adjust an optical path length difference of the two optical beams at the focused place; an interference optical system configured to allow a reproduced light generated by irradiating any one of the two optical beams onto the optical information recording medium to interfere with a reproduction reference light generated from a light source to generate two interference lights different in interference phase by substantially 180 degrees from each other at the same time; a second optical path length adjustment unit configured to adjust the optical path length difference between the reproduced light and the reproduction reference light; and a phase adjustment unit configured to adjust a phase difference between an average electric field that averaged an electric field by a modulation of the reproduced light and an electric field of the reproduction reference light; a detector configured to detect an intensity difference between the two interference lights.