Double-grating frequency shifter for low-coherence heterodyne interferometry

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Wang, Kaiwei and Zeng, L. (2005) Double-grating frequency shifter for low-coherence heterodyne interferometry. Optics Communications, 251 (1-3). pp. 1-5. ISSN 0030-4018

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Official URL: http://dx.doi.org/10.1016/j.optcom.2005.02.067

DOI: 10.1016/j.optcom.2005.02.067

Abstract

A double-grating frequency shifter for low-coherence heterodyne interferometry is proposed. Compared with conventional frequency shifting methods, the new frequency shifter can generate frequency shift without additional optical path delay between different wavelengths. It also in principle has no scanning range limitation because the scanning mirror moves in a part of an optical system where different wavelength constituents of the light propagate in the same direction. To demonstrate the effectivity of the frequency shifter, a Twyman–Green interferometer was connected with the frequency shifter through an optical fiber. Displacement values measured by the low-coherence heterodyne interferometer have a standard deviation of 0.09µm for a displacement range of 50µm.

Item Type:	Article
Additional Information:	UoA 25 (General Engineering) © 2005 Elsevier B.V. All rights reserved.
Subjects:	T Technology > T Technology (General) Q Science > QC Physics
Schools:	School of Computing and Engineering School of Computing and Engineering > Centre for Precision Technologies School of Computing and Engineering > Centre for Precision Technologies > Surface Metrology Group
Related URLs:	Author
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Depositing User:	Briony Heyhoe
Date Deposited:	12 Jul 2007
Last Modified:	03 Dec 2010 08:51
URI:	http://eprints.hud.ac.uk/id/eprint/290

Double-grating frequency shifter for low-coherence heterodyne interferometry

Abstract

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