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Rev Sci Instrum. 2013 Nov;84(11):115002. doi: 10.1063/1.4831800.

Absolute distance sensing by two laser optical interferometry.

Author information

1
attocube systems AG, Königinstraße 11a RGB, 80539 München, Germany.

Abstract

We have developed a method for absolute distance sensing by two laser optical interferometry. A particularity of this technique is that a target distance is determined in absolute and is no longer limited to within an ambiguity range affecting usually multiple wavelength interferometers. We implemented the technique in a low-finesse Fabry-Pérot miniature fiber based interferometer. We used two diode lasers, both operating in the 1550 nm wavelength range. The wavelength difference is chosen to create a 25 μm long periodic beating interferometric pattern allowing a nanometer precise position measurement but limited to within an ambiguity range of 25 μm. The ambiguity is then eliminated by scanning one of the wavelengths over a small range (3.4 nm). We measured absolute distances in the sub-meter range and this with just few nanometer repeatability.

PMID:
24289429
DOI:
10.1063/1.4831800

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