OPTICAL INFORMATION RECORDING DEVICE AND OPTICAL INFORMATION RECORDING METHOD

PROBLEM TO BE SOLVED: To provide an optical information recording reproduction device and an optical information recording reproduction method capable of recording and reproducing information included in a light with high density using a spatial light modulator which handles two gradations.SOLUTION: An optical information recording reproduction device 1 comprises: a signal light generation mechanism 10; a spatial frequency filtering mechanism 20; a reference light generation mechanism 30; and an optical information recording medium 50. The signal light generation mechanism 10 comprises: a phase application part 11 for applying plural phase values to an input light; and a spatial light modulator 15 for forming plural individual pixels to which the plural phase values are allocated individually, and selecting and applying one of pieces of prescribed two gradations to the individual pixels. The spatial light modulator 15 fictionalizes plural individual pixels which exist in a constant range spatially or in a time-variant manner as a single pixel, with respect to the optional individual pixel, for forming a single virtual pixel, then based on a complex value in which the phase value applied to each individual pixel is a deviation angle and the information of the two gradations, applies the information of a sum of the complex value to the signal light.SELECTED DRAWING: Figure 1 【課題】２階調を扱う空間光変調器を用いて、光に含まれる情報を高い密度で記録再生することが可能な光情報記録再生装置及び光情報記録再生方法を提供する。【解決手段】信号光生成機構１０、空間周波数フィルタリング機構２０、参照光生成機構３０及び光情報記録媒体５０を備え、信号光生成機構１０は、入力光に複数の位相値を付与する位相付与部１１と、複数の位相値が個別に割り当てられる複数の個別画素を形成し、個別画素に所定の２階調の情報のいずれか一方を選択して付与する空間光変調器１５と、を備え、空間光変調器１５は、任意の個別画素に対し空間的又は時間的に一定範囲に存在する複数の個別画素を１画素として擬制して１つの仮想画素を構成し、各個別画素に付与された位相値を偏角とする複素数値と２階調の情報とに基づいて複素数値の和に関する情報を前記信号光に付与する光情報記録再生装置１等により課題を解決する。【選択図】図１