Optical: systems and elements – Holographic system or element – Using modulated or plural reference beams
Patent
1992-11-12
1994-04-26
Lerner, Martin
Optical: systems and elements
Holographic system or element
Using modulated or plural reference beams
359 28, 359 30, 359 35, 372 49, 372102, G02B 532, G02B 2744, G03H 104, H01S 308
Patent
active
053071832
ABSTRACT:
An apparatus 10 for exposing a curved grating pattern of monochromatic light on a photoresist coated semiconductor wafer 12 includes an argon gas laser 14 that outputs a monochromatic light beam 16. This monochromatic light beam 16 is filtered and collimated to produce a monochromatic light beam with a planar wavefront 24. A portion of this planar wavefront passes through a cylindrical lens array 26 and a first baffle slit 30, producing multiple cylindrical wavefront 34 that is incident upon a hypotenuse face 38 of a right angle prism 40. Another portion of the planar wavefront passes through a second baffle slit 32, producing a smaller planar wavefront 36 that is also incident upon the hypotenuse face 38 of the right angle prism 40. A destructive interference between a reflected multiple cylindrical wavefront 92 and a direct planar wavefront 90 inside the prism 40 produces a curved grating pattern of monochromatic light on an adjacent prism face 42. This curved grating pattern of monochromatic light is projected toward the semiconductor wafer 12, thereby exposing the photoresist coated wafer surface 48 with the curved grating pattern.
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Denson-Low Wanda K.
Hughes Aircraft Company
Lerner Martin
Sales Michael W.
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