Abstract
In recent years much effort has been devoted to the designs of diffractive optical elements (DOE’s) because of considerable progress in DOE microfabrication technology. In the previous papers various designs of DOE’s have been presented, these elements produce focal annuli for monochromatic illuminating system1, or implement wavelength demultiplexing and straight line or spot focusing.2–5
© 1996 Optical Society of America
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