White Light Optical Fourier Transform Device.
Patent Application, Filed 9 Sep 91,
DEPARTMENT OF THE ARMY WASHINGTON DC
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A White Light Optical Fourier Transform Device, hereinafter referred to as the Transform Device, comprised of symmetrically positioned birefringent crystal wedges and a half-wave plate inserted between them is placed in the path of light, incoming at an angle of incidence. The Transform Device functions in both coherent and incoherent lights to produce the Fourier transform of the incident light beam by inducing a relative angle hereinafter referred to as the tilt angle between the wavefronts of the two polarized components of the output beam. With the Transform Device, this angle is linearly proportional to the angle of incidence. The output produced by the Transform Device is the Fourier transform itself rather than its square, as is the case for coherent Fourier transforms using a lens as the transform element.