In displacement measurements by two-beam interferometers, the wavefront curvature of a laser beam causes a systematic increase of the fringe period. This increase depends on beam collimation: It is null for a plane wave and proportional to the squared divergence of the beam. With interfering beams not perfectly recombined, an additional fringe-period error is caused, with the effect of counteracting and also of compensating for and prevailing over the usual error. We describe this hitherto unsuspected effect and give a correction equation. (c) 2006 Optical Society of America.

Aberration effects in two-beam laser interferometers / Cavagnero, Giovanni; Mana, Giovanni; Massa, Enrico. - In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION. - ISSN 1084-7529. - 23:8(2006), pp. 1951-1959. [10.1364/JOSAA.23.001951]

Aberration effects in two-beam laser interferometers

MANA, GIOVANNI;MASSA, ENRICO
2006

Abstract

In displacement measurements by two-beam interferometers, the wavefront curvature of a laser beam causes a systematic increase of the fringe period. This increase depends on beam collimation: It is null for a plane wave and proportional to the squared divergence of the beam. With interfering beams not perfectly recombined, an additional fringe-period error is caused, with the effect of counteracting and also of compensating for and prevailing over the usual error. We describe this hitherto unsuspected effect and give a correction equation. (c) 2006 Optical Society of America.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/33106
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