Abstract

The refractive index of a sample of As2S3 was determined at three temperatures near 19°, 25°, and 31°C for selected wavelengths in the range 0.57 μ to 11.8 μ. A five term Sellmeier type dispersion equation was fitted to the averaged data reduced to 25°C; four of the constants were chosen to approximate an absorption continuum in the ultraviolet and visible while the fifth term was arbitrarily chosen as beyond the infrared absorption edge. The indexes of refraction in the visible region of two other samples were obtained for comparison.

© 1958 Optical Society of America

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References

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  1. R. Frerichs, Phys. Rev. 78, 643 (1950); J. Opt. Soc. Am. 43, 1153 (1953).
  2. W. A. Fraser and J. Jerger, J. Opt. Soc. Am. 43, 322A (1953).
  3. F. W. Glaze and et al., J. Research Natl. Bur. Standards 59, 83 (1957), RP 2774.
    [CrossRef]
  4. W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
    [CrossRef]
  5. W. S. Rodney and I. H. Malitson, J. Opt. Soc. Am. 46, 11, 956 (1956).
    [CrossRef]
  6. Private communication.
  7. W. A. Fraser, Proceedings of the Conference on Infrared Optical Materials, Filters and Films ERDL, (Fort Belvoir, Virginia, 1955).

1957 (1)

F. W. Glaze and et al., J. Research Natl. Bur. Standards 59, 83 (1957), RP 2774.
[CrossRef]

1956 (1)

W. S. Rodney and I. H. Malitson, J. Opt. Soc. Am. 46, 11, 956 (1956).
[CrossRef]

1953 (2)

W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
[CrossRef]

W. A. Fraser and J. Jerger, J. Opt. Soc. Am. 43, 322A (1953).

1950 (1)

R. Frerichs, Phys. Rev. 78, 643 (1950); J. Opt. Soc. Am. 43, 1153 (1953).

Fraser, W. A.

W. A. Fraser and J. Jerger, J. Opt. Soc. Am. 43, 322A (1953).

W. A. Fraser, Proceedings of the Conference on Infrared Optical Materials, Filters and Films ERDL, (Fort Belvoir, Virginia, 1955).

Frerichs, R.

R. Frerichs, Phys. Rev. 78, 643 (1950); J. Opt. Soc. Am. 43, 1153 (1953).

Glaze, F. W.

F. W. Glaze and et al., J. Research Natl. Bur. Standards 59, 83 (1957), RP 2774.
[CrossRef]

Jerger, J.

W. A. Fraser and J. Jerger, J. Opt. Soc. Am. 43, 322A (1953).

Malitson, I. H.

W. S. Rodney and I. H. Malitson, J. Opt. Soc. Am. 46, 11, 956 (1956).
[CrossRef]

Rodney, W. S.

W. S. Rodney and I. H. Malitson, J. Opt. Soc. Am. 46, 11, 956 (1956).
[CrossRef]

W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
[CrossRef]

Spindler, R. J.

W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
[CrossRef]

J. Opt. Soc. Am. (2)

W. A. Fraser and J. Jerger, J. Opt. Soc. Am. 43, 322A (1953).

W. S. Rodney and I. H. Malitson, J. Opt. Soc. Am. 46, 11, 956 (1956).
[CrossRef]

J. Research Natl. Bur. Standards (2)

F. W. Glaze and et al., J. Research Natl. Bur. Standards 59, 83 (1957), RP 2774.
[CrossRef]

W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
[CrossRef]

Phys. Rev. (1)

R. Frerichs, Phys. Rev. 78, 643 (1950); J. Opt. Soc. Am. 43, 1153 (1953).

Other (2)

Private communication.

W. A. Fraser, Proceedings of the Conference on Infrared Optical Materials, Filters and Films ERDL, (Fort Belvoir, Virginia, 1955).

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Figures (4)

Fig. 1
Fig. 1

Wild spectrometer: The instrument has a source rack capable of holding four lamps. The double ways for centering the prism were added. The small eyepiece below the telescope eyepiece is for reading the scale and has an optical averaging device.

Fig. 2
Fig. 2

Refractive index as a function of wavelength: On the long wavelength side the absorption becomes too high for measurement before the region of high dispersion is reached.

Fig. 3
Fig. 3

Dispersion as a function of wavelength: The dispersion in the visible is roughly the same as that of KRS-5. At the minimum and out toward longer wavelengths the As2S3 has much higher dispersion. The dispersions of KRS-5, CsBr, and CsI are shown for comparison.

Fig. 4
Fig. 4

Thermal coefficient of index as a function of wavelength: The coefficients become effectively zero near 4 microns indicating a balancing of the effects of shift of absorption wavelength and expansion near this wavelength. The NBS sample has the same property, but for shorter wavelengths.

Tables (3)

Tables Icon

Table I Computed refractive indexes of As2S3 at 25°C.

Tables Icon

Table II Observed and computed data on index of refraction of As2S3 at 25°C.

Tables Icon

Table III Computed dispersion of As2S3 at 25°C.

Equations (1)

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n 2 - 1 = i = 1 i = 5 K i λ 2 λ 2 - λ i 2 .