Hologram recording/reproducing device and optical unit

Details Hologram recording/reproducing device and optical unit Hologram recording/reproducing device and optical unit

2007-10-16

2007-10-16

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S024000, C359S035000, C365S125000, C365S216000, C369S103000

Reexamination Certificate

active

11314441

ABSTRACT:
A hologram recording/reproducing device includes a laser light source emitting laser light; a spatial light modulator generating signal light and reference light from the laser light emitted from the laser light source, the signal light and the reference light traveling in a common light path; a first relay lens system including a first shielding plate at a focal position thereof and transmitting the signal light and the reference light generated by the spatial light modulator, the first shielding plate having a pinhole whose size is 1 to 2 times a Nyquist size; a phase modulating element disposed at a conjugate plane of the signal light and the reference light transmitted through the first relay lens system; an objective lens converging the signal light and the reference light transmitted through the phase modulating element on a hologram recording medium; and a light receiving system disposed between the phase modulating element and objective lens and receiving light returning from the hologram recording medium.

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