Influence of resonances on the phase and the group refractive indices of air |
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| Authors: | Y S Galkin R A Tatevian |
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| Institution: | (1) Ecological Lab. Dept. of Physics, Moscow State University of Forest; Mytischy-1, Moscow, 141001, Russia e-mail: galkin@ mgul.ac.ru, RU;(2) Dept. of Metrology and Standard., TsNIIGAiK, Onezskaya 26, Moscow, 125413, Russia, RU |
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| Abstract: | The Barrell and Sears and Edlen formulae use the Sellmeier form away from resonances, which gives a “smooth” dependence within
the visible and near-infrared spectra. All known atlases indicate numerous resonances in these regions, which cause local
disturbance of the dispersion curve. Anomalous dispersion may be estimated from an absorption by the Kramer-Kronig ratios.
It gives a change of phase refractive index of air in a range from several ppt to 1 ppb within narrow optical regions, causing
large local dispersions. Computation of the group refractive index with the use of Rayleigh's ratio shows that the influence
of resonance effects may be more than several ppm. For example, the error of the group refractive index for high-precision
EDM using HeNe lasers (633 nm) varies between 0.2 and 0.7 ppm, depending on the laser stability.
Received: 17 July 1996 / Accepted: 27 March 1997 |
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| Keywords: | , High-precision EDM,Spectral atlas,Phase and group refractive indices |
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