Lennart Robertsson 2007 Metrologia 44 35 doi:10.1088/0026-1394/44/1/005
Lennart Robertsson
Show affiliationsThe field distribution of a Gaussian light beam introduces additional space-dependent phase shifts compared with that of a flat wave front. An expression for these phase corrections is derived for the case of a two-beam interferometer. The contribution from these diffraction-induced shifts to the g-value determined in absolute gravimetry is calculated. It is found that in the case of a beam waist of a few millimetres or smaller and, particularly, for unbalanced interferometers, a careful consideration of this effect is crucial if high accuracy is desired.
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
Issue 1 (February 2007)
Received 11 April 2006
Published 2 January 2007
Lennart Robertsson 2007 Metrologia 44 35
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