λ/2 fringe-spacing interferometer
Optics Letters, Vol. 34, Issue 6, pp. 755-757 (2009) doi:10.1364/OL.34.000755
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- 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
Instrumentation, Measurement, and Metrology
Citation
H. Guillet de Chatellus and J.-P. Pique, "λ/2 fringe-spacing interferometer," Opt. Lett. 34, 755-757 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-6-755
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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 D1 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
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History
Original Manuscript: November 6, 2008
Manuscript Accepted: February 4, 2009
Revised Manuscript: January 20, 2009
Published: March 6, 2009
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Author Affiliations
Laboratoire de Spectrométrie Physique UMR 5588 CNRS-Université Joseph Fourier
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