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Applied Optics

Applied Optics


  • Vol. 33, Iss. 25 — Sep. 1, 1994
  • pp: 5975–5981

Reststrahlen band studies of polycrystalline beryllium oxide

Teddy Chibuye, Carl G. Ribbing, and Ewa Wäckelgård  »View Author Affiliations

Applied Optics, Vol. 33, Issue 25, pp. 5975-5981 (1994)

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New experimental bulk reflectance and emittance spectra from the 9–15-μm reststrahlen band region of polycrystallline beryllium oxide are reported. Note that the polycrystalline material exhibits a dip at 10 μm, which is not present in spectra for single crystals. The possible origins of this feature are discussed including absorption by a surface oscillation excited at boundaries of 20-μm crystalline grains. Owing to the reststrahlen band, beryllium oxide is selectively low, emitting in the primary atmospheric window, which makes this material useful for frost prevention when electrical conductors cannot be used. This protection is susceptible to reduction by surface contaminants from air pollution. Using an established acceleration procedure, we simulated such pollution, and the increase in emittance was measured. It was observed that the emissivity increased from 0.31 for a clean surface to 0.36 for a surface heavily polluted by an industrial atmosphere.

© 1994 Optical Society of America

Original Manuscript: July 15, 1993
Revised Manuscript: November 22, 1993
Published: September 1, 1994

Teddy Chibuye, Carl G. Ribbing, and Ewa Wäckelgård, "Reststrahlen band studies of polycrystalline beryllium oxide," Appl. Opt. 33, 5975-5981 (1994)

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