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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22195–22207

Digitally enhanced homodyne interferometry

Andrew J. Sutton, Oliver Gerberding, Gerhard Heinzel, and Daniel A. Shaddock  »View Author Affiliations


Optics Express, Vol. 20, Issue 20, pp. 22195-22207 (2012)
http://dx.doi.org/10.1364/OE.20.022195


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Abstract

We present two variations of a novel interferometry technique capable of simultaneously measuring multiple targets with high sensitivity. The technique performs a homodyne phase measurement by application of a four point phase shifting algorithm, with pseudo-random switching between points to allow multiplexed measurement based upon propagation delay alone. By multiplexing measurements and shifting complexity into signal processing, both variants realise significant complexity reductions over comparable methods. The first variant performs a typical coherent detection with a dedicated reference field and achieves a displacement noise floor 0.8pm/√Hz above 50Hz. The second allows for removal of the dedicated reference, resulting in further simplifications and improved low frequency performance with a 1pm/√Hz noise floor measured down to 20Hz. These results represent the most sensitive measurement performed using this style of interferometry whilst simultaneously reducing the electro-optic footprint.

© 2012 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2920) Instrumentation, measurement, and metrology : Homodyning
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 25, 2012
Revised Manuscript: August 29, 2012
Manuscript Accepted: August 30, 2012
Published: September 13, 2012

Citation
Andrew J. Sutton, Oliver Gerberding, Gerhard Heinzel, and Daniel A. Shaddock, "Digitally enhanced homodyne interferometry," Opt. Express 20, 22195-22207 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-20-22195


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