Superior resolution laser using bessel transform optical filter

Details Superior resolution laser using bessel transform optical filter Superior resolution laser using bessel transform optical filter

1994-08-12

1996-06-04

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Specified cavity component

372102, H01S 308

Patent

active

055240186

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.

REFERENCES:
patent: 3247467 (1966-04-01), Geusic et al.
patent: 4498184 (1985-02-01), O'Meara

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