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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1663–1667

Refractive Index of Air. 2. Group Index

Philip E. Ciddor and Reginald J. Hill  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1663-1667 (1999)
http://dx.doi.org/10.1364/AO.38.001663


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Abstract

In a previous paper [Appl. Opt. <b>35,</b> 1566 (1996)] one of us presented new equations for evaluation of the phase refractive index of air over a range of wavelengths and atmospheric parameters. That paper also gave an incorrect, although sufficiently accurate, procedure for calculating the group refractive index. Here we describe the results of a more rigorous derivation of the group index that takes proper account of the Lorentz–Lorenz formula, and we demonstrate that deviations from the Lorentz–Lorenz formula are insignificant to within a foreseeable precision of dispersion measurements for atmospheric conditions. We also derive and evaluate a simplification of the resultant equation that is useful for exploratory calculations. We clarify the limits of validity of the standard equation for the group refractive index and correct some minor errors in the previous paper.

© 1999 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology

Citation
Philip E. Ciddor and Reginald J. Hill, "Refractive Index of Air. 2. Group Index," Appl. Opt. 38, 1663-1667 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1663


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References

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