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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 56, Iss. 11 — Nov. 1, 1966
  • pp: 1546–1549

Optical Constants of Incandescent Refractory Metals

BENTLEY T. BARNES  »View Author Affiliations

JOSA, Vol. 56, Issue 11, pp. 1546-1549 (1966)

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Filaments of semicircular cross section (diam 0.25–0.32 mm) were mounted in bulbs with plane windows. Chopped plane-polarized radiant flux was reflected from the flat surface, then passed through an analyzer whose plane of polarization made a 45° angle with the plane of reflection at the filament. The orientation of the polarizer was varied in 45° steps, and wavelengths from 0.47 to 2.0 µ were used. The metals studied were W, Mo, Ta, Ir, Re, Nb, and Pt. Filament temperatures ranged from 300 to 2400–25000°K. (Maximum for Pt was 1900°.) n-vs-λ curves for different temperatures were close together in the visible, but spread apart with increasing wavelength in the infrared. Curves showing kvs λ and e vs λ usually crossed one another near a common point. Deviations from previously published data ranged up to 15 or 20%. Systematic errors in some of the infrared data, due to difficulty in centering the reflecting surface in the beam from the source lamp, are quiet obvious. Rough agreement with a simplified form of the Drude theory is approached with increasing wavelength in certain cases.

BENTLEY T. BARNES, "Optical Constants of Incandescent Refractory Metals," J. Opt. Soc. Am. 56, 1546-1549 (1966)

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  1. D. G. Avery, Proc. Phys. Soc. (London) 65B, 425 (1952).
  2. Nn-ik.
  3. J. N. Hodgson, Proc. Phys. Soc. (London) 68B 593 (1955).
  4. J. R. Beattie and G. K. T. Conn, Phil. Mag. 46, 222 (1955); J. R. Beattie, Phil. Mag. 46, 235 (1955).
  5. For references to Drude's articles and a discussion of the advantages of the theory based on two types of free-charge carriers, see S. Roberts, Phys. Rev. 100, 1667 (1955).

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