The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

, Volume 5, Issue 3, pp 433-440

A Fourier optics model of two-beam scanning laser interferometers

  • A. BergaminAffiliated withCNR, Istituto di Metrologia “G. Colonnetti”, strada delle Cacce 73, 10135 Torino, Italy
  • , G. CavagneroAffiliated withCNR, Istituto di Metrologia “G. Colonnetti”, strada delle Cacce 73, 10135 Torino, Italy
  • , L. CordialiAffiliated withCNR, Istituto di Metrologia “G. Colonnetti”, strada delle Cacce 73, 10135 Torino, Italy
  • , G. ManaAffiliated withCNR, Istituto di Metrologia “G. Colonnetti”, strada delle Cacce 73, 10135 Torino, Italy

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Abstract:

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