WAVELENGTH CONTROLLING METHOD, HOLOGRAM INFORMATION PROCESSOR, AND HOLOGRAM RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a hologram information processor capable of simply setting a reproducing wavelength or a recording wavelength, and also shortening a regulation time.

SOLUTION: When the wavelength of a laser beam of a wavelength variable laser is controlled (step S0), an optical system or a hologram recording medium is moved (step S1), and a state where a light beam is made incident on a wavelength control pattern is made. Then, the wavelength control pattern is irradiated with a reference light being a laser beam (step S2). Next, the reproducing light from the wavelength control pattern is measured with a light receiving element (step S3). The wavelength of the reference light being a laser beam is minutely changed. The light quantity of the reproducing light changes in accordance with the wavelength; the light quantity of the reproducing light is monitored, and a specified wavelength λ0in which the light quantity of the reproducing light reaches the maximum (the rotation angle of the diffraction grating 52) is obtained (step S4). Then, the wavelength of the laser beam of a wavelength variable laser beam source is regulated (step S5).

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