Wavelength Measurements in the UV and Vacuum UV

  • G. H. C. Freeman
  • Vera P. Matthews


The NPL is using a Michelson Interferometer for the measurement of wavelengths in the UV and VUV. The interferogram produced by a particular line is examined at a number of widely separated path differences by scanning over a short distance (1 to 4 fringes), so as to obtain the visibility and also the phase relative to that of a reference wavelength interferogram. These directly yield the shape of the line and its wavelength.


Beam Splitter Path Difference National Physical Laboratory Michelson Interferometer Wavelength Measurement 
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Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • G. H. C. Freeman
    • 1
  • Vera P. Matthews
    • 1
  1. 1.National Physical LaboratoryTeddington, MiddlesexUK

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