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Proceedings Paper

Harmonically-related gratings-based quadrature phase interferometers
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Paper Abstract

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.

Paper Details

Date Published: 20 February 2007
PDF: 8 pages
Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880J (20 February 2007); doi: 10.1117/12.701585
Show Author Affiliations
Zahid Yaqoob, California Institute of Technology (United States)
Jigang Wu, California Institute of Technology (United States)
Xiquan Cui, California Institute of Technology (United States)
Xin Heng, California Institute of Technology (United States)
Changhuei Yang, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 6488:
Practical Holography XXI: Materials and Applications
Roger A. Lessard; Hans I. Bjelkhagen, Editor(s)

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