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Harmonically-related gratings-based quadrature phase interferometers

Yaqoob, Zahid and Wu, Jigang and Cui, Xiquan and Heng, Xin and Yang, Changhuei (2007) Harmonically-related gratings-based quadrature phase interferometers. In: Practical Holography XXI: Materials and Applications. Proceedings of SPIE. No.6488. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 64880J. ISBN 9780819466013.

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We report a new method for obtaining non-trivial phase difference between the output ports of an interferometer through the use of shallow diffraction gratings. We show that as opposed to a single shallow diffraction grating-based interferometer (which provides only trivial phase shifts, i.e., 0° or 180°), a pair of harmonically-related shallow diffraction gratings can be used to design interferometers with non-trivial phase shifts between different output ports. More importantly, the phase shifts can be adjusted by simply shearing one grating with respect to the other. This approach does not change the path length relationships of the different interference beams within the interferometer, which is an advantage for metrology and low coherence interferometry applications.

Item Type:Book Section
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Yang, Changhuei0000-0001-8791-0354
Additional Information:© 2007 Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject Keywords:Diffraction gratings, quadrature phase interferometry, metrology, medical and biological imaging
Series Name:Proceedings of SPIE
Issue or Number:6488
Record Number:CaltechAUTHORS:20180716-110055154
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Official Citation:Zahid Yaqoob, Jigang Wu, Xiquan Cui, Xin Heng, Changhuei Yang, "Harmonically-related gratings-based quadrature phase interferometers", Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880J (20 February 2007); doi: 10.1117/12.701585;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87879
Deposited By: George Porter
Deposited On:16 Jul 2018 22:51
Last Modified:16 Nov 2021 00:21

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