Patent ID: 7835049

Claim:
A reproducing apparatus adapted to reproduce data recorded in the form of an interference fringe produced as a result of interference between signal light and reference light on a holographic recording medium, comprising: reference light generation means for generating the reference light for illuminating the holographic recording medium to produce reproduced image corresponding to the data recorded on the holographic recording medium; coherent light generation means for generating coherent light having an intensity greater than the absolute value of a minimum amplitude of the reproduced image and having a phase equal to the phase of the reproduced image; an optical system adapted to transmit the reference light and the coherent light to the holographic recording medium; image signal acquisition means for sensing a reproduced image, which corresponds to the data recorded on the holographic recording medium and which is produced as a result of illuminating the holographic recording medium with the reference light and the coherent light via the optical system, and acquiring an image signal based on the reproduced image; square root calculation means for calculating the square root of each of values constituting the image signal acquired by the image signal acquisition means; removal means for removing the component of the coherent light from the square root, calculated by the square root calculation means, for each of values constituting the image signal; and data reproducing means for reproducing the data recorded on the holographic recording medium, on the basis of the image signal supplied from the removal means.