Authors

M. A. Arain;N. A. Riza

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Abbreviated Journal Title

Opt. Eng.

Keywords

Optics

Abstract

Proposed and demonstrated is an angstrom level optical path length (OPL) detection sensitivity polarization multiplexed heterodyne acousto-optic interferometric sensor. Because both the phase-coded and the reference rf signals in the design are generated by the same optics, the heterodyne detected rf signals generated contain correlated phase noise characteristics that essentially cancel out during the mixing process in the rf domain. Hence, the proposed four-beam design leads to a super stability OPL sensor with angstrom level experimentally demonstrated measurement stability. A proof-of-concept experiment measures the voltage-dependent phase change due to the refractive index change of a liquid crystal sensor chip.

Journal Title

Optical Engineering

Volume

44

Issue/Number

5

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000232590600025

ISSN

0091-3286

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