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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 12 — Apr. 20, 2013
  • pp: 2808–2814

Low-cost scheme for high-precision dual-wavelength laser metrology

Yitping Kok, Michael J. Ireland, J. Gordon Robertson, Peter G. Tuthill, Benjamin A. Warrington, and William J. Tango  »View Author Affiliations

Applied Optics, Vol. 52, Issue 12, pp. 2808-2814 (2013)

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A method capable of delivering relative optical path length metrology with nanometer precision is demonstrated. Unlike conventional dual-wavelength metrology, which employs heterodyne detection, the method developed in this work utilizes direct detection of interference fringes of two He–Ne lasers as well as a less precise stepper motor open-loop position control system to perform its measurement. Although the method may be applicable to a variety of circumstances, the specific application in which this metrology is essential is in an astrometric optical long baseline stellar interferometer dedicated to precise measurement of stellar positions. In our example application of this metrology to a narrow-angle astrometric interferometer, measurement of nanometer precision could be achieved without frequency-stabilized lasers, although the use of such lasers would extend the range of optical path length the metrology can accurately measure. Implementation of the method requires very little additional optics or electronics, thus minimizing the cost and effort of implementation. Furthermore, the optical path traversed by the metrology lasers is identical to that of the starlight or science beams, even down to using the same photodetectors, thereby minimizing the noncommon path between metrology and science channels.

© 2013 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 20, 2013
Revised Manuscript: March 26, 2013
Manuscript Accepted: March 28, 2013
Published: April 17, 2013

Yitping Kok, Michael J. Ireland, J. Gordon Robertson, Peter G. Tuthill, Benjamin A. Warrington, and William J. Tango, "Low-cost scheme for high-precision dual-wavelength laser metrology," Appl. Opt. 52, 2808-2814 (2013)

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