Optical: systems and elements – Lens – With multipart element
Patent
1993-09-14
1996-01-02
Sugarman, Scott J.
Optical: systems and elements
Lens
With multipart element
21912168, 21912169, G02B 308, B23K 2600
Patent
active
054814073
ABSTRACT:
An apparatus for using and a process of using a Fresnel zone plate array is utilized for processing materials. An optically stable frame receives coherent light and passes the coherent light through beam processing optics such as a collimator, a beam expanding telescope and an aperture. Thereafter, the beam is routed to scanning mirrors immediately overlying a Fresnel zone plate array. The Fresnel zone plate array has a plurality of discrete subapertures with each subaperture containing image information at a discrete working distance from the plate; each image produced by a subaperture of the Fresnel zone plate array typically differs from adjacent images from adjacent subapertures typically in size, shape or gain. The beam is scanned and registered to a discrete selected subaperture on the plate to cause an image from the subaperture to form on a work piece located at the working distance of a scanned subaperture. Once the image is selected, the work piece is moved relative to the Fresnel zone plate array to register the image of the discrete subaperture at the required location for processing on the work piece. At each location for processing utilizing a particular selected image, the work piece is positioned, and the laser pulsed with the selected image causing processing of the work piece. Utilizing the disclosed apparatus and process, a work piece can be configured by multiple image exposures from arbitrarily selected subapertures on the Fresnel zone plate array to produce a precisely spaced and precisely configured array of holes or other shapes of extreme small dimension.
REFERENCES:
patent: 4909818 (1990-03-01), Jones
patent: 5223693 (1993-06-01), Zumoto et al.
Hunter, Jr. Robert O.
McArthur Bruce B.
Smith Adlai H.
Litel Instruments
Sugarman Scott J.
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