Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2005-12-13
2005-12-13
Chang, Audrey (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S569000, C359S566000, C372S098000, C372S103000
Reexamination Certificate
active
06975458
ABSTRACT:
A method and apparatus for converting a Gaussian laser beam into a propagating far field diffraction pattern using an off-axis diffractive optic. This propagating far field pattern is focused by a lens to obtain a flattop intensity at the focal plane. The technique is based on the idea of Fourier transform pairs and produces a small spot diameter with a useable depth of field. A focused uniform intensity profile can be useful for many laser applications.
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Chang Audrey
O'Banion John P.
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