Direct-to-digital holography reduction of reference hologram...

Details Direct-to-digital holography reduction of reference hologram... Direct-to-digital holography reduction of reference hologram...

2006-06-27

2006-06-27

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S457000

Reexamination Certificate

active

07068375

ABSTRACT:
Systems and methods are described for reduction of reference hologram noise and reduction of Fourier space smearing, especially in the context of direct-to-digital holography (off-axis interferometry). A method of reducing reference hologram noise includes: recording a plurality of reference holograms; processing the plurality of reference holograms into a corresponding plurality of reference image waves; and transforming the corresponding plurality of reference image waves into a reduced noise reference image wave. A method of reducing smearing in Fourier space includes: recording a plurality of reference holograms; processing the plurality of reference holograms into a corresponding plurality of reference complex image waves; transforming the corresponding plurality of reference image waves into a reduced noise reference complex image wave; recording a hologram of an object; processing the hologram of the object into an object complex image wave; and dividing the complex image wave of the object by the reduced noise reference complex image wave to obtain a reduced smearing object complex image wave.

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Reynolds, Develis, Parrent, Thompson: “The New Physical Optics Notebook: Tutorial In Fourier Optics” 1989, American Institute of Physics and SPIE The International Society for Optical Engineering, New York, Washington, XP002288228, pp. 208-209, figure 21.14.

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