Holographic recording method and filtering method

A holographic recording apparatus comprising:

• a light source which emits coherent light;
• a first spatial light modulator which modulates in intensity the light from the light source so as to generate object light;
• a first image forming optical system which irradiates an optical storage medium with the object light;
• a second spatial light modulator which modulates in polarization the light from the light source so as to generate reference light having a spatial polarization distribution in conformity with a shape of a spatial frequency filter;
• and
• a second image forming optical system which irradiates the optical storage medium with the reference light.

A filtering apparatus comprising:

• a light source which emits coherent light;
• a spatial light modulator which modulates in polarization the light from the light source so as to generate retrieval light having a spatial polarization distribution different from that of reference light, the retrieved light being applied onto an optical storage medium having holograms stored thereon by Fourier transformed object light and by the reference light;
• and
• an image forming optical system for applying the retrieval light onto the optical storage medium.

A filtering apparatus comprising:

• a light source which emits coherent light;
• a spatial light modulator which modulates in intensity the light from the light source so as to generate object light of a target image to be retrieved;
• and
• an image forming optical system which irradiates, with the object light, an optical storage medium having a hologram stored thereon by Fourier transformed object light of the target image and by reference light which has a spatial polarization distribution in conformity with a shape of a spatial frequency filter.

A filtering apparatus comprising:

• a light source which emits coherent light;
• a first spatial light modulator which modulates in intensity the light from the light source so as to generate object light of a target image to be retrieved;
• a first image forming optical system which irradiates, with the object light, an optical storage medium having a hologram stored thereon by Fourier transformed object light of the target image and by reference light;
• a second spatial light modulator which modulates in polarization the light from the light source so as to generate retrieval light having a spatial polarization distribution different from that of the reference light;
• a second image forming optical system which irradiates the optical storage medium with the retrieval light;
• a first photo detector which detects first diffracted light obtained by irradiating the holograms with the object light of the target image;
• and
• a second photo detector which detects second diffracted light obtained by irradiating the holograms with the retrieval light.