Main > Chinese Optics Letters >  Volume 15 >  Issue 11 >  Page 111201 > Article
Chinese Optics Letters, Vol. 15, Issue 11, pp.111201 (2017)

Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression

Xisheng Xiao1,2,3, Qinghua Yu1,2,*, Zhentao Zhu1,2,3, Kai Hu1,2, and Guilin Chen1,2

Author Affiliations

  • 1Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, Shanghai 200083, China
  • 2Key Laboratory of Infrared System Detection and Imaging technology, Chinese Academy of Sciences, Shanghai 200083, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

The use of a computer-generated hologram (CGH) in interferometric testing provides new methods for highly accurate optical measurement. To fabricate a CGH, polygons are used to approximate the smooth CGH pattern. Because the data size supported by CGH writing machines is limited, the number of polygon vertices must be limited. Therefore, the CGH-encoding method determines the encoding accuracy. To realize a highly accurate optical measurement using CGHs, we propose a CGH-pattern-encoding method based on non-maxima suppression. A self-aligned CGH is designed to verify the accuracy. The experimental result shows that a highly accurate CGH can be fabricated using this method.