HOLOGRAM RECORDING AND REPRODUCING APPARATUS

摘要

PROBLEM TO BE SOLVED: To avoid making a hologram shape unstable due to a wavelength change of a light source at the time of recording a hologram and to avoid reproducing a hologram image different from an image at the time of recording due to a wavelength change of the light source at the time of reproducing the hologram in a collinear hologram recording and reproducing apparatus.

SOLUTION: Light from a light source 1 is divided into signal light 8 and reference light 9 and the signal light 8 and the reference light 9 record or/and reproduce hologram information on a hologram medium 7 through the same lens. In this hologram recording and reproducing apparatus of a collinear hologram system, the lens is controlled to have axial chromatic aberration where focal distance (f) satisfies a relation: f×λ= constant toward an optional wavelength λ and further the lens satisfies a sine condition toward the optional wavelength λ. Thereby a change of the recording shape due to a wavelength change of the light source at the time of recording the hologram can be avoided and trouble of producing a change in the reproduced hologram image due to a wavelength change at the time of reproducing the hologram can be improved.

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