Method of holographic recording and reproduction, holographic recording medium and holographic recording and reproducing apparatus

A holographic recording and reproducing apparatus by which information is recorded as a hologram to a holographic recording medium, comprising:

• a light source;
• a spatial light modulator spatially modulating intensity and/or phase of an optical beam from the light source to generate an information beam, a reference beam, and spots corresponding to a wavelength variation reference pattern;
• an optical system configured to irradiate the holographic recording medium with the reference beam and the spots corresponding to the wavelength variation reference pattern as a recording beam for wavelength variation reference pattern, with the information beam and the reference beam collinearly as a recording beam, and with only the reference beam as a reproducing beam, respectively;
• a photo-detector arranged on the same side as the optical system with respect to the holographic recording medium;
• a wavelength variation detector detecting a wavelength variation of the reproducing beam to the recording beam based on a size of an image for wavelength variation reference obtained by the photo-detector by irradiating the wavelength variation reference pattern recorded to the holographic recording medium with the reproducing beam;
• and
• a wavelength controller controlling wavelength of the light source based on a detection result by the wavelength variation detector.