American Cinematographer - July 1977

In the recent video on the closure of the ILM model shop…where you had the microfiche type masters for photo etch…this came to mind:
phys.org

A low-cost microscope projection photolithography system for high-resolution fabrication

Integrated optical signal distributing, processing, and sensing networks require the miniaturization of basic optical elements, such as waveguides, splitters, gratings, and optical switches. To achieve this, fabrication approaches that allow for high-resolution manufacturing are required.
phys.org phys.org

You can make your own microdots now.
 

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