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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 6 — Mar. 15, 2009
  • pp: 755–757

λ 2 fringe-spacing interferometer

H. Guillet de Chatellus and J.-P. Pique  »View Author Affiliations

Optics Letters, Vol. 34, Issue 6, pp. 755-757 (2009)

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The precision of interferometry is directly linked to the fringe spacing of the recorded interferogram. Whereas all interferometric devices show a fringe spacing equal to a wavelength of the laser light we present a novel scheme of a two-beam interferometer exhibiting a fringe spacing reduced by a factor of 2; the direct detection of the beat signal is replaced with the monitoring of the fluorescence of a twofold degenerate atomic system resonant with the laser. The λ 2 fringe spacing in the fluorescence signal is demonstrated with a hot sodium vapor excited by a broadband laser tuned to the D 1 line. In the saturation regime, the dark fringes are expected to be extremely narrow, leading to the possibility of nanoscale displacement measurements or atom localization.

© 2009 Optical Society of America

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.2050) Lasers and laser optics : Dye lasers
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6210) Spectroscopy : Spectroscopy, atomic

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 6, 2008
Revised Manuscript: January 20, 2009
Manuscript Accepted: February 4, 2009
Published: March 6, 2009

H. Guillet de Chatellus and J.-P. Pique, "λ/2 fringe-spacing interferometer," Opt. Lett. 34, 755-757 (2009)

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