A Fourier optics model of two-beam scanning laser interferometers
CNR, Istituto di Metrologia "G. Colonnetti", strada delle Cacce 73, 10135 Torino,
Revised: 21 October 1998
Accepted: 16 November 1998
Published online: 15 March 1999
The article illustrates the use of Fourier optics to describe the operation of two-beam scanning laser interferometers. It deals with the effect of diffraction on the spatial periodicity of a monochromatic and coherent beam. Particular attention is given to the analysis of systematic errors in high-accuracy laser metrology. The article reviews the special case of plane wave and Gaussian illuminations, examines how beam truncation affects the period of traveling fringes and presents a general relation between the relative wavelength deviation and the impulse standard deviation of the photons.
PACS: 42.25.Fx – Diffraction and scattering / 42.25.Hz – Interference
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999