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20 February 2007 Harmonically-related gratings-based quadrature phase interferometers
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zahid Yaqoob, Jigang Wu, Xiquan Cui, Xin Heng, and Changhuei Yang "Harmonically-related gratings-based quadrature phase interferometers", Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880J (20 February 2007);

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