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Proceedings Paper

Evaluation of DOE designed results
Author(s): Jinyu Wang; Gang Li; Chu Zhang; Yingbai Yan; Qiaofeng Tan; Guofan Jin
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Paper Abstract

Diffractive optical element (DOE) is used to convert inputting optical field to the outputting one on image plane with desired intensity distribution. Since DOE design is a numerical process, the definition of performance parameter of approach distance (PPAD) under continuous condition is given and methods of calculation from discrete samples are argued. Correspondingly, discrete performance parameter of approach distance (DPPAD) is defined to evaluate designed results during designing process under discrete condition. According to the PPAD calculation equation under continuous condition and DPPAD under discrete condition, a general DOE designed result shows that sometimes there are tremendous differences between PPAD value and DPPAD. By analyzing the errors of DPPAD, it is pointed out that to design a faithful DOE result, the sampling interval between 2 neighbor points on outputting plane must has extra limitation despite of sampling theory. Otherwise, the designed result just looks good but it is a bad one in fact, and the DPPAD will not be consistent with PPAD. In the end, an example of faithful designed DOE is given.

Paper Details

Date Published: 3 November 2003
PDF: 6 pages
Proc. SPIE 5175, Laser Beam Shaping IV, (3 November 2003);
Show Author Affiliations
Jinyu Wang, Ordnance Engineering College (China)
Gang Li, Ordnance Engineering College (China)
Chu Zhang, Ordnance Engineering College (China)
Yingbai Yan, Tsinghua Univ. (China)
Qiaofeng Tan, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 5175:
Laser Beam Shaping IV
Fred M. Dickey; David L. Shealy, Editor(s)

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