Method and apparatus for optical beam shaping

Details Method and apparatus for optical beam shaping Method and apparatus for optical beam shaping

1983-08-24

1985-05-21

Henry, Jon W.

Electric heating

Microwave heating

Tunnel furnace

350613, 219121LQ, G02B 510

Patent

active

045182329

ABSTRACT:
A method and apparatus for transforming an obscured beam into a uniform intensity pattern at the image plane of the apparatus are described. Apparatus for carrying out the invention comprises two on-axis optical elements which are designed for stigmatic imaging of an incoming obscured parallel laser beam. The first element, a paraboloid mirror, forms an imaginary stigmatic image of the beam at its focal point. The second element, a multi-faceted mirror, comprises identical flat facets disposed on an ellipsoid envelope. The ellipsoid conjugates the focal point of the paraboloid and the image plane. Selection of an image shape and dimension defines the shape and dimension of the facets. Each facet's contribution to the image is a full scale centered spot. The contribution of each facet add up to form a final uniform image. Slight variation of the image dimension, from facet to facet, allows a roll-off of the image and compensates for diffraction ripples by the edges of the facets.

REFERENCES:
patent: 4132955 (1979-01-01), Hughes
patent: 4153929 (1979-05-01), Laudenschlarger et al.
patent: 4200846 (1980-04-01), Stark, Jr. et al.
patent: 4264869 (1981-04-01), Hunter
patent: 4271360 (1981-06-01), Ward
patent: 4311360 (1982-01-01), Hodson et al.
patent: 4345212 (1982-08-01), Seppala et al.
patent: 4475027 (1984-10-01), Pressley

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