Holographic imaging device and holographic imaging method

A holographic imaging device, comprising:

• a data acquisition unit for acquiring data of an object light (O) emitted from an illuminated object and data of an inline spherical wave reference light (L) being inline with the object light (O), electronically and individually, as two kinds of off-axis holograms (IOR, ILR) on a hologram plane defined at a light receiving surface of an image sensor, using an off-axis reference light (R) maintained under the same conditions;
• and
• an image reconstruction unit for reconstructing an image of the object from the data acquired by the data acquisition unit, wherein
• the data acquisition unit comprises:
• a beam coupler consisting of a cube-type beam splitter, wherein the data acquisition unit acquires data of two lights of the object light (O) and the inline spherical wave reference light (L), passing through the beam coupler and being incident on the image sensor as the data of the two kinds of the off-axis holograms (IOR, ILR), individually,
• the image reconstruction unit comprises:
• a complex amplitude hologram generation unit for generating a complex amplitude inline hologram (JOL) on the hologram plane, containing information on both of the object light (O) and the inline spherical wave reference light (L), from the data of the two kinds of the off-axis holograms (IOR, ILR);
• a calculation reference light hologram generation unit for generating an inline reference light hologram (jL) representing a light wave of the inline spherical wave reference light (L) on the hologram plane by performing a light wave propagation calculation, based on the information on a position of a condensing point (P2) of the inline spherical wave reference light (L), using a plane wave expansion method, including propagation calculation inside the beam coupler in consideration of refractive index of the beam coupler;
• and
• an object light hologram generation unit for generating an object light hologram (g) being a hologram of the object light (O), on the hologram plane, by eliminating components of the inline spherical wave reference light (L) from the data of the complex amplitude inline hologram (JOL) using the data of the inline reference light hologram (jL).