Abstract

The refractive indexes of a mixed crystal containing 45.7 mole percent thallium bromide and 54.3 mole percent thallium iodide were measured at three temperatures near 19, 25, and 31°C for wavelengths from 0.5770 to 39.38 μ. The data were fitted to Sellmeier dispersion equations and thermal coefficients of index were computed. Dispersion coefficients were determined at 25°. The results were compared with data on a similar crystal.

© 1956 Optical Society of America

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References

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  1. Smakula, Kalnajs, and Sils, J. Opt. Soc. Am. 43, 698 (1953).
    [Crossref]
  2. Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
    [Crossref]
  3. W. S. Rodney and R. J. Spindler, J. Research Natl. Bur. Standards 51, 123 (1953).
    [Crossref]
  4. W. S. Rodney, J. Opt. Soc. Am. 45, 987 (1955).
    [Crossref]
  5. H. Keegan, National Bureau of Standards (private communication).
  6. T. K. McCubbin and W. M. Sinton, J. Opt. Soc. Am. 42, 113 (1952).
    [Crossref]
  7. W. M. Sinton and W. C. Davis, J. Opt. Soc. Am. 44, 503 (1954).
    [Crossref]
  8. Tables of dielectric materials Vol. IV, Laboratories for Insulation Research, Massachusetts Institute of Technology (1953).
  9. A. Smakula, J. Opt. Soc. Am. 45, 1086 (1955).
    [Crossref]
  10. E. K. Plyler and N. Acquista, J. Research Natl. Bur. Standards 49, 61 (1952).
    [Crossref]
  11. N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Clarendon Press, Oxford, 1940), p. 110. W. J. Turner, dissertation, Catholic University of America (1955).
  12. Combes, Ballard, and McCarthy, J. Opt. Soc. Am. 41, 215 (1951).
    [Crossref]

1955 (2)

1954 (1)

1953 (2)

Smakula, Kalnajs, and Sils, J. Opt. Soc. Am. 43, 698 (1953).
[Crossref]

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

1952 (2)

E. K. Plyler and N. Acquista, J. Research Natl. Bur. Standards 49, 61 (1952).
[Crossref]

T. K. McCubbin and W. M. Sinton, J. Opt. Soc. Am. 42, 113 (1952).
[Crossref]

1951 (1)

1949 (1)

Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
[Crossref]

Acquista, N.

E. K. Plyler and N. Acquista, J. Research Natl. Bur. Standards 49, 61 (1952).
[Crossref]

Ballard,

Combes,

Davis, W. C.

Gurney, R. W.

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Clarendon Press, Oxford, 1940), p. 110. W. J. Turner, dissertation, Catholic University of America (1955).

Kalnajs,

Keegan, H.

H. Keegan, National Bureau of Standards (private communication).

McCarthy,

McCubbin, T. K.

Mott, N. F.

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Clarendon Press, Oxford, 1940), p. 110. W. J. Turner, dissertation, Catholic University of America (1955).

Plyler,

Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
[Crossref]

Plyler, E. K.

E. K. Plyler and N. Acquista, J. Research Natl. Bur. Standards 49, 61 (1952).
[Crossref]

Rodney, W. S.

W. S. Rodney, J. Opt. Soc. Am. 45, 987 (1955).
[Crossref]

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

Sils,

Sinton, W. M.

Smakula,

Smakula, A.

Spindler, R. J.

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

Stephens,

Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
[Crossref]

Tilton,

Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
[Crossref]

J. Opt. Soc. Am. (6)

J. Research Natl. Bur. Standards (3)

E. K. Plyler and N. Acquista, J. Research Natl. Bur. Standards 49, 61 (1952).
[Crossref]

Tilton, Plyler, and Stephens, J. Research Natl. Bur. Standards 43, 81 (1949).
[Crossref]

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

Other (3)

H. Keegan, National Bureau of Standards (private communication).

N. F. Mott and R. W. Gurney, Electronic Processes in Ionic Crystals (Clarendon Press, Oxford, 1940), p. 110. W. J. Turner, dissertation, Catholic University of America (1955).

Tables of dielectric materials Vol. IV, Laboratories for Insulation Research, Massachusetts Institute of Technology (1953).

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Figures (4)

Fig. 1
Fig. 1

Dispersion coefficients of 55 KRS–5 as a function of wavelength compared with those of CsBr and CsI (both abscissa and ordinate are logarithmically graduated).

Fig. 2
Fig. 2

Average thermal coefficient near room temperature as a function of wavelength. The values plotted are weighted averages of the coefficients computed from the raw data and those computed using the formula values of index.

Fig. 3
Fig. 3

Differences between the indexes of the 47 material and the 55 material as a function of wavelength. The higher values for the 47 material are to be expected from the composition. The increase in the differences at the end points indicates a difference in dispersion which also is a result of the difference in composition.

Fig. 4
Fig. 4

Mercury 5770–5790 doublet photographed through 55 KRS–5 prism (top) and 47 KRS–5 prism (bottom). This figure was taken from a colored slide.

Tables (5)

Tables Icon

Table I The observed and computed indexes of the 55 material at 19, 25, and 31°C and residuals. (λ=wavelength in μ.)

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Table II Refractive index of the 55 KRS–5 sample at six temperatures for several visible wavelengths.

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Table III Constants of the dispersion equation at 25°C.

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Table IV Computed refractive index of the 55 KRS–5 at 25°C for regular wavelength intervals. (λ=wavelength in μ.)

Tables Icon

Table V Average thermal coefficients of KRS–5 near room temperature. (λ=wavelength in μ.)

Equations (2)

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n 2 - 1 = j K j λ 2 λ 2 - λ j 2 ,
d n d t = - β ( n 2 - 1 ) 2 n ,