Abstract

A convenient apparatus is described for making refractive index measurements on a 60° prism, in the near infrared region. The instrument is essentially a double Wadsworth mirror monochromator, the first half being calibrated in wave-lengths, and the second half calibrated to read angular rotations of the prism table on which the unknown prism is mounted. The wave-length drum was calibrated by working backwards from a known prism (rocksalt or quartz) mounted on the second prism table. Measurements on eleven optical glasses are given, from 0.365 to 2.6μ.

© 1937 Optical Society of America

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References

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  1. Lee, J. Sci. Inst. 9, 277 (1932).
    [Crossref]
  2. For a survey of the subject, see Baly, Spectroscopy1, p. 216; Lecomte, Le Spectre Infrarouge, p. 97;and Schaefer and Matossi, Das Ultrarote Spektrum, p. 40.
  3. Wadsworth, Phil. Mag. [5]  38, 337 (1894);also Gibbs and Collins, Astrophys. J. 56, 483 (1922).
    [Crossref]
  4. Langley, Ann. d. Physik [3]  22, 598 (1884).
    [Crossref]
  5. Paschen, Ann. d. Physik [3]  53, 301 (1894).
    [Crossref]
  6. Rubens, Ann. d. Physik [3]  45, 238 (1892).
    [Crossref]
  7. Lowry and Coode-Adams, Phil. Trans. Roy. Soc. 226, 391 (1927).
    [Crossref]
  8. Edser and Butler, Proc. Phys. Soc. 16, 207 (1898).
  9. Carvallo, J. de phys. 2, 27 (1893).
  10. Paschen, Ann. d. Physik [4]  35, 1005 (1911).
    [Crossref]
  11. Micheli, Ann. d. Physik 7, 772 (1902).
    [Crossref]
  12. Langley, Ann. Smithson. Ast. Obs. 1, 101 (1902).
  13. Reference 12, p. 235.
  14. Zeits. f. Instrumentenk. 48, 275 (1928).
  15. Carvallo, Comptes rendus 126, 728 (1898).
  16. Under “maker,” B-L indicates Bausch and Lomb, and PM Parra-Mantois. The “type numbers” for the three PM glasses are melt numbers.
  17. Abbott and Fowle, Astrophys. J. 11, 135 (1900).
    [Crossref]

1932 (1)

Lee, J. Sci. Inst. 9, 277 (1932).
[Crossref]

1928 (1)

Zeits. f. Instrumentenk. 48, 275 (1928).

1927 (1)

Lowry and Coode-Adams, Phil. Trans. Roy. Soc. 226, 391 (1927).
[Crossref]

1911 (1)

Paschen, Ann. d. Physik [4]  35, 1005 (1911).
[Crossref]

1902 (2)

Micheli, Ann. d. Physik 7, 772 (1902).
[Crossref]

Langley, Ann. Smithson. Ast. Obs. 1, 101 (1902).

1900 (1)

Abbott and Fowle, Astrophys. J. 11, 135 (1900).
[Crossref]

1898 (2)

Carvallo, Comptes rendus 126, 728 (1898).

Edser and Butler, Proc. Phys. Soc. 16, 207 (1898).

1894 (2)

Wadsworth, Phil. Mag. [5]  38, 337 (1894);also Gibbs and Collins, Astrophys. J. 56, 483 (1922).
[Crossref]

Paschen, Ann. d. Physik [3]  53, 301 (1894).
[Crossref]

1893 (1)

Carvallo, J. de phys. 2, 27 (1893).

1892 (1)

Rubens, Ann. d. Physik [3]  45, 238 (1892).
[Crossref]

1884 (1)

Langley, Ann. d. Physik [3]  22, 598 (1884).
[Crossref]

Abbott,

Abbott and Fowle, Astrophys. J. 11, 135 (1900).
[Crossref]

Baly,

For a survey of the subject, see Baly, Spectroscopy1, p. 216; Lecomte, Le Spectre Infrarouge, p. 97;and Schaefer and Matossi, Das Ultrarote Spektrum, p. 40.

Butler,

Edser and Butler, Proc. Phys. Soc. 16, 207 (1898).

Carvallo,

Carvallo, Comptes rendus 126, 728 (1898).

Carvallo, J. de phys. 2, 27 (1893).

Coode-Adams,

Lowry and Coode-Adams, Phil. Trans. Roy. Soc. 226, 391 (1927).
[Crossref]

Edser,

Edser and Butler, Proc. Phys. Soc. 16, 207 (1898).

Fowle,

Abbott and Fowle, Astrophys. J. 11, 135 (1900).
[Crossref]

Langley,

Langley, Ann. Smithson. Ast. Obs. 1, 101 (1902).

Langley, Ann. d. Physik [3]  22, 598 (1884).
[Crossref]

Lee,

Lee, J. Sci. Inst. 9, 277 (1932).
[Crossref]

Lowry,

Lowry and Coode-Adams, Phil. Trans. Roy. Soc. 226, 391 (1927).
[Crossref]

Micheli,

Micheli, Ann. d. Physik 7, 772 (1902).
[Crossref]

Paschen,

Paschen, Ann. d. Physik [4]  35, 1005 (1911).
[Crossref]

Paschen, Ann. d. Physik [3]  53, 301 (1894).
[Crossref]

Rubens,

Rubens, Ann. d. Physik [3]  45, 238 (1892).
[Crossref]

Wadsworth,

Wadsworth, Phil. Mag. [5]  38, 337 (1894);also Gibbs and Collins, Astrophys. J. 56, 483 (1922).
[Crossref]

Ann. d. Physik (5)

Langley, Ann. d. Physik [3]  22, 598 (1884).
[Crossref]

Paschen, Ann. d. Physik [3]  53, 301 (1894).
[Crossref]

Rubens, Ann. d. Physik [3]  45, 238 (1892).
[Crossref]

Paschen, Ann. d. Physik [4]  35, 1005 (1911).
[Crossref]

Micheli, Ann. d. Physik 7, 772 (1902).
[Crossref]

Ann. Smithson. Ast. Obs. (1)

Langley, Ann. Smithson. Ast. Obs. 1, 101 (1902).

Astrophys. J. (1)

Abbott and Fowle, Astrophys. J. 11, 135 (1900).
[Crossref]

Comptes rendus (1)

Carvallo, Comptes rendus 126, 728 (1898).

J. de phys. (1)

Carvallo, J. de phys. 2, 27 (1893).

J. Sci. Inst. (1)

Lee, J. Sci. Inst. 9, 277 (1932).
[Crossref]

Phil. Mag. (1)

Wadsworth, Phil. Mag. [5]  38, 337 (1894);also Gibbs and Collins, Astrophys. J. 56, 483 (1922).
[Crossref]

Phil. Trans. Roy. Soc. (1)

Lowry and Coode-Adams, Phil. Trans. Roy. Soc. 226, 391 (1927).
[Crossref]

Proc. Phys. Soc. (1)

Edser and Butler, Proc. Phys. Soc. 16, 207 (1898).

Zeits. f. Instrumentenk. (1)

Zeits. f. Instrumentenk. 48, 275 (1928).

Other (3)

Under “maker,” B-L indicates Bausch and Lomb, and PM Parra-Mantois. The “type numbers” for the three PM glasses are melt numbers.

Reference 12, p. 235.

For a survey of the subject, see Baly, Spectroscopy1, p. 216; Lecomte, Le Spectre Infrarouge, p. 97;and Schaefer and Matossi, Das Ultrarote Spektrum, p. 40.

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Figures (3)

F. 1
F. 1

General arrangement of the infrared refractometer.

F. 2
F. 2

Dispersion curves of eleven optical glasses.

F. 3
F. 3

Color curves for visual and photographic achromatism.

Tables (2)

Tables Icon

Table I Temperature coefficient of rocksalt.

Tables Icon

Table II Refractive indices of optical glasses.

Equations (2)

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n 2 = 5.174714 + 0.0183744 / ( λ 2 0.015841 ) 8949.52 / ( 3145.695 λ 2 ) .
n 2 = 3.5968913 + 0.01064379 / ( λ 2 0.0106291 ) 138.20519 / ( 111.45202 λ 2 ) .