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Proceedings Paper

Polarization phase-shifting double-shearing interferometer for the test of the diffraction-limited wavefront
Author(s): Lijuan Wang; Liren Liu; Zhu Luan; Jianfeng Sun; Yu Zhou
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Paper Abstract

In the inter-satellite laser communication, the laser wavefront reaches the diffraction limit. For the test of the diffraction-limited wavefront, we have developed a Jamin double-shearing interferometer of which the detectable wave-front height is in the order of 0.1 wavelengths. Based on this interferometer, a polarization phase-shifting double-shearing interferometer is proposed to improve the performance. The existing Jamin double-shearing interferometer is consists of two Jamin plates to form lateral shearing and four wedge plates to divide the aperture. The polarization phase shifter is composed of three polarizers, a quarter-wave plate and an analyzer. The first polarizer is placed in front of the first Jamin plate. The second and third polarizers are placed behind the wedge plates and their transmission axes are parallel and perpendicular to the incident plane of the Jamin plates, respectively. The fast axis of the quarter-wave plate has an angle of 45 degrees to the transmission axis of the second and third polarizers. By rotating the analyzer, the phase-shift interferogram is obtained. In the interferometer, the polarization phase shifter is simple to be inserted and the phase shifting is easy to realize. The interferometer is kept as an equal optical path system and still suits wavefront testing of the low coherent light. In experiments, phase-shifting interferograms are obtained and the usefulness of the interferometer is verified.

Paper Details

Date Published: 25 September 2007
PDF: 8 pages
Proc. SPIE 6709, Free-Space Laser Communications VII, 67091H (25 September 2007); doi: 10.1117/12.731955
Show Author Affiliations
Lijuan Wang, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Zhu Luan, Shanghai Institute of Optics and Fine Mechanics (China)
Jianfeng Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Yu Zhou, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 6709:
Free-Space Laser Communications VII
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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