Apparatus for direct-to-digital spatially-heterodyned holography

Thomas, Clarence E.; Hanson, Gregory R.

Apparatus for direct-to-digital spatially-heterodyned holography

Patent · Tue Dec 12 04:00:00 EST 2006

OSTI ID:1176030

Thomas, Clarence E.; Hanson, Gregory R.

An apparatus operable to record a spatially low-frequency heterodyne hologram including spatially heterodyne fringes for Fourier analysis includes: a laser; a beamsplitter optically coupled to the laser; an object optically coupled to the beamsplitter; a focusing lens optically coupled to both the beamsplitter and the object; a digital recorder optically coupled to the focusing lens; and a computer that performs a Fourier transform, applies a digital filter, and performs an inverse Fourier transform. A reference beam and an object beam are focused by the focusing lens at a focal plane of the digital recorder to form a spatially low-frequency heterodyne hologram including spatially heterodyne fringes for Fourier analysis which is recorded by the digital recorder, and the computer transforms the recorded spatially low-frequency heterodyne hologram including spatially heterodyne fringes and shifts axes in Fourier space to sit on top of a heterodyne carrier frequency defined by an angle between the reference beam and the object beam and cuts off signals around an original origin before performing the inverse Fourier transform.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-96OR22464

Assignee:: UT-Battelle LLC (Oak Ridge, TN)

Patent Number(s):: 7,148,969

Application Number:: 11/327,851

OSTI ID:: 1176030

Country of Publication:: United States

Language:: English

References (11)

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