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Optical Engineering

Fabrication of continuous surface-relief gratings using a high-precision diamond-cutting process
Author(s): Jun Amako; Hitoshi Nakao; Shinichiro Ochiai
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Paper Abstract

Direct fabrication of continuous surface-relief gratings on acrylics using a high-precision diamond-cutting process is reported. Critical conditions such as the diamond-tip radius and cutting step were selected by taking account of a designed grating profile and an expected roughness on the obtained grating surface. Experimental results for a 13-fanout continuous phase grating are presented. The phase profile was optimized using a stochastic design algorithm. A 3-mm-thick acrylic plate was carved into a grating that provided a measured efficiency of 85% with Fresnel reflection losses uncorrected. The diffracted intensity distribution was rather sensitive to any departure from the designed profile, the 0th-order intensity being particularly affected. Compensating the material's springback was found critical to the grating's performance.

Paper Details

Date Published: 1 August 2001
PDF: 8 pages
Opt. Eng. 40(8) doi: 10.1117/1.1370386
Published in: Optical Engineering Volume 40, Issue 8
Show Author Affiliations
Jun Amako, Seiko Epson Corp. (Japan)
Hitoshi Nakao, Seiko Epson Corp. (Japan)
Shinichiro Ochiai, Shimada Precision (Japan)

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