Abstract

The reflectance and optical constants of films of zinc sulfide vacuum deposited onto glass have been measured for the wavelength region extending from 2200 to 584 A. The effects of different deposition conditions and aging in normal and dry air were studied. In the wavelength range from 2200 to 1100 A the reflectance is relatively high (≈33%) and uniform. Beyond 1100 A it decreases and at 584 A is only 3.8%. The refractive index, n, decreases rapidly from a value of 3.13 at 2200 A to a minimum of 0.64 at 735 A. The absorption coefficient, k, has a maximum value of 1.75 at 1800 A and decreases with decreasing wavelength to a value of 0.23 at 584 A. In contrast to many other materials the variation of deposition conditions has very little effect on the reflectance of zinc sulfide. The films also show almost no aging in normal or dry air. Under the best conditions these films are durable enough to stand washing with cotton and detergent many times without damage.

© 1959 Optical Society of America

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References

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  1. A. H. Pfund, J. Opt. Soc. Am. 24, 99 (1934).
    [Crossref]
  2. Joseph F. Hall and W. F. C. Ferguson, J. Opt. Soc. Am. 45, 714 (1955);Joseph F. Hall, J. Opt. Soc. Am. 46, 1013 (1956).
    [Crossref]
  3. C. K. Coogan, Proc. Phys. Soc. (London) B70, 845 (1957).
    [Crossref]
  4. J. T. Cox and G. Hass, J. Opt. Soc. Am. 48, 677 (1958).
    [Crossref]
  5. Hass, Hunter, and Tousey, J. Opt. Soc. Am. 46, 1009 (1956).
    [Crossref]
  6. Hass, Hunter, and Tousey, J. Opt. Soc. Am. 47, 120(A) (1957).

1958 (1)

1957 (2)

C. K. Coogan, Proc. Phys. Soc. (London) B70, 845 (1957).
[Crossref]

Hass, Hunter, and Tousey, J. Opt. Soc. Am. 47, 120(A) (1957).

1956 (1)

1955 (1)

1934 (1)

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Figures (4)

F. 1
F. 1

Reflectance at normal incidence of a vacuum deposited zinc sulfide film 1200 A thick.

F. 2
F. 2

Reflectance of vacuum deposited films of zinc sulfide and pure aluminum (age when measured, two months).

F. 3
F. 3

Reflectance as a function of angle of incidence of a vacuum deposited 1200 A thick zinc sulfide film for several wavelengths in the vacuum ultraviolet.

F. 4
F. 4

Optical constants of zinc sulfide vacuum deposited onto glass at room temperature.

Tables (1)

Tables Icon

Table I Reflectance of vacuum deposited films of zinc sulfide and pure aluminum (age when measured, two years).