Optics: measuring and testing – By light interference – Having light beams of different frequencies
Reexamination Certificate
2006-12-12
2006-12-12
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
Having light beams of different frequencies
C356S457000, C356S489000
Reexamination Certificate
active
07148969
ABSTRACT:
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.
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Hanson Gregory R.
Thomas Clarence E.
Connolly Patrick J.
John Bruckner PC
Toatley , Jr. Gregory J.
UT-Battelle LLC
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