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Proceedings Paper

Compact wavefront diagnosis system based on the randomly encoded hybrid grating
Author(s): Tong Ling; Dong Liu; Yongying Yang; Xiumei Yue; Jiabin Jiang
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Paper Abstract

A compact wavefront diagnosis system with nice repeatability based on the randomly encoded hybrid grating (REHG) is proposed. The REHG comes from the ideally calculated grating for quadriwave lateral shearing interference, and it consists of a binary amplitude grating and a phase chessboard. The phase chessboard simulates the phase modulation of the ideally calculated grating, while the binary amplitude grating is designed and fabricated based on the randomly encoding method. In this method, the amplitude distribution on the ideally calculated grating is firstly divided into discrete grids. And the radiant flux in each grid is quantized into several quantization levels. The binary amplitude grating is then generated by encoding the pixels in the grids with 1 and 0, which stands for whether the light can pass through or not, so that the total radiant flux in each grid on this grating approximate to the flux in the corresponding grid on the ideally calculated quadriwave grating. In addition, random pattern is employed in the encoding process to avoid introducing extra diffraction orders. The far-field diffractions of the REHG only contain the ±1 orders in two orthogonal directions, and no order selection mask is needed for quadriwave lateral shearing interference. Due to the common-path configuration, the wavefront testing results obtained by the REHG lateral shearing interferometer exhibits nice repeatability and good suppression over environmental noise and vibration.

Paper Details

Date Published: 12 October 2015
PDF: 7 pages
Proc. SPIE 9633, Optifab 2015, 963329 (12 October 2015); doi: 10.1117/12.2195441
Show Author Affiliations
Tong Ling, Zhejiang Univ. (China)
Dong Liu, Zhejiang Univ. (China)
Yongying Yang, Zhejiang Univ. (China)
Xiumei Yue, Zhejiang Univ. (China)
Jiabin Jiang, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 9633:
Optifab 2015
Julie L. Bentley; Sebastian Stoebenau, Editor(s)

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