Abstract

Normal incidence measurements of single-layer gradient refractive-index antireflection films, produced by a chemical etch-leach process on glass sensitized by a phase-separating heat treatment, indicate very low reflection over a broad wavelength regime, 0.35-2.5 µm. First-surface measurements of the reflectance of the gradient index films have now been made, in the visible regime, at off-normal incidence (to 70°) using polarized light. These measurements show that significant reflection reduction is obtained even at high angles of incidence—5.7% reflectance from the filmed glass at 70° compared to 16.4% for the unfilmed glass. Furthermore, although the films exhibit a weak wavelength dependence at high angles, they continue to be effective over a broad spectral region. The optical properties observed are in good agreement with computations based on a gradient refractive-index film with a step at the air-film interface. The optical properties of the film offer considerable advantage over conventional interference films in many applications.

© 1977 Optical Society of America

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References

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  1. M. J. Minot, J. Opt. Soc. Am. 66, 515–519 (1976).
  2. Krylon® Paint, Borden, Inc., Columbus, Ohio.
  3. Harrick Scientific Corp., Ossining, N. Y.
  4. W. Konig, Handbuch der Physik, Vol. 20 (Springer, Berlin, 1928), p. 66.
  5. G. Hass and J. E. Waylonis, J. Opt. Soc. Am. 50, 1133 (1960).
  6. R. Jacobsson, Progress in Optics V, edited by E. Wolf (North-Holland, Amsterdam, 1966), p. 249.
  7. M. Born and E. Wolf, Principles of Optics (Pergamon, New York, 1975), pp. 55–61.

Born, M.

M. Born and E. Wolf, Principles of Optics (Pergamon, New York, 1975), pp. 55–61.

Hass, G.

G. Hass and J. E. Waylonis, J. Opt. Soc. Am. 50, 1133 (1960).

Jacobsson, R.

R. Jacobsson, Progress in Optics V, edited by E. Wolf (North-Holland, Amsterdam, 1966), p. 249.

Konig, W.

W. Konig, Handbuch der Physik, Vol. 20 (Springer, Berlin, 1928), p. 66.

Minot, M. J.

M. J. Minot, J. Opt. Soc. Am. 66, 515–519 (1976).

Waylonis, J. E.

G. Hass and J. E. Waylonis, J. Opt. Soc. Am. 50, 1133 (1960).

Wolf, E.

M. Born and E. Wolf, Principles of Optics (Pergamon, New York, 1975), pp. 55–61.

Other (7)

M. J. Minot, J. Opt. Soc. Am. 66, 515–519 (1976).

Krylon® Paint, Borden, Inc., Columbus, Ohio.

Harrick Scientific Corp., Ossining, N. Y.

W. Konig, Handbuch der Physik, Vol. 20 (Springer, Berlin, 1928), p. 66.

G. Hass and J. E. Waylonis, J. Opt. Soc. Am. 50, 1133 (1960).

R. Jacobsson, Progress in Optics V, edited by E. Wolf (North-Holland, Amsterdam, 1966), p. 249.

M. Born and E. Wolf, Principles of Optics (Pergamon, New York, 1975), pp. 55–61.

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