Superior resolution laser using bessel transform optical filter
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United States of America Patent
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Jun 4, 1996
Issued Date -
N/A
app pub date -
Aug 12, 1994
filing date -
Oct 4, 1993
priority date (Note) -
Expired
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Abstract
A fraction of the theoretical spot size in a lens system is obtained by applying a filter consisting of a variable pitch circular grating, in front of the focus lens. The focal point Image of a lens is a spot called an Airy disk. The diameter of the Airy disk is proportional to (wavelength)/(Numerical Aperture). Numerical aperture is equal to (1/2 of the diameter of the lens)/(focal length). This is the theoretical limit of spot size. Using a Bessel Transform, modified circular grating, filter the resulting first and higher order diffraction images lie on the optical axis and interfere resulting in a small beam spot at the focus surrounded by interference bands, producing a narrowed zero order beam for projection in optical and infrared applications.
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