Lithographic fabrication of large diffractive optical elements on a concave lens surface

We demonstrate experimentally the lithography technique to fabricate a large computer-generated diffractive optical element (DOE) pattern on a concave lens surface with precise alignment by using a laser direct writer. We obtained photoresist film with uniform thickness on the large concave substrat...

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Published in:Optics express 2002-10, Vol.10 (20), p.1043-1047
Main Authors: Xie, Yongjun, Lu, Zhenwu, Li, Fengyou, Zhao, Jingli, Weng, Zhicheng
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Language:English
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container_issue 20
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container_title Optics express
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creator Xie, Yongjun
Lu, Zhenwu
Li, Fengyou
Zhao, Jingli
Weng, Zhicheng
description We demonstrate experimentally the lithography technique to fabricate a large computer-generated diffractive optical element (DOE) pattern on a concave lens surface with precise alignment by using a laser direct writer. We obtained photoresist film with uniform thickness on the large concave substrate by selecting proper spin-coating parameters, which mainly involve spin rate, spin acceleration, and viscosity of the photoresist. We obtained a square line profile on the concave lens surface. We can write lines that range in width from 0.7 to 10 microm using a single pass of the laser beam. We have designed and fabricated a grating on the concave lens surface using the laser direct writing lithography technique. It is believed that this technique can also transfer large DOE patterns, with a continuous surface relief, onto a convex or concave lens (mirror) surface.
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title Lithographic fabrication of large diffractive optical elements on a concave lens surface
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