# this file is part of refractiveindex.info database
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REFERENCES: "1) G. H. Sherman et al. Proceedings of the Symposium on Sub-millimeter Waves (Polytechnic Press, Brooklyn, 1970)<br>2) G. C. Bhar, Refractive index interpolation in phase-matching, <a href=\"https://doi.org/10.1364/AO.15.0305_1\"><i>Appl. Opt.</i> <b>15</b>, 305-307 (1976)</a><br>*Ref. 2 provides Sellmeier equation based on the data from Ref. 1"
COMMENTS: "Extraordinary ray"
DATA:
  - type: formula 2
    range: 8.5 30.3
    coefficients: 0.9041 36.8133 1.0803 6.2456 10000
