Abstract

The index of refraction of optical quality fused silica (SiO2) was determined for 60 wavelengths from 0.21 to 3.71 μ at 20°C. The dispersion equation

n2-1=0.6961663λ2λ2-(0.0684043)2+0.4079426λ2λ2-(0.1162414)2+0.8974794λ2λ2-(9.896161)2.

where λ is expressed in microns was found to yield an absolute residual of 10.5×10−6. The variation in index between 12 specimens was determined. Dispersive properties of the material and thermal coefficient of index are graphically presented. A comparison with previous NBS index data is discussed.

© 1965 Optical Society of America

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References

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  1. R. B. Sosman, The Properties of Silica (Chemical Catalog Company, Inc., New York, 1927).
  2. W. C. Heraeus, 60 Jahre Quarzglas 25 Jahre Hochvakuumtechnik (GmbH, Hanau, Federal Republic of Germany, 1961). A review of this book has been published in J. Opt. Soc. Am. 54, 1067 (1964).
  3. W. S. Rodney and R. J. Spindler, J. Res. Natl. Bur. Std. 53, 185 (1954).
    [Crossref]
  4. The author wishes to thank the aforementioned companies for providing specimens of these domestic brands of fused silica for measurement, and for granting the National Bureau of Standards permission to reveal the brand identifications of the data published in this paper. In no case does such identification imply recommendation or endorsement by the National Bureau of Standards, nor does it imply that any one brand is necessarily the best available.
  5. F. W. Rosberry (private communication).
  6. J. W. Schleter (private communication).
  7. L. E. Sutton and O. N. Stavroudis, J. Opt. Soc. Am. 51, 901 (1961).
    [Crossref]
  8. L. W. Tilton and A. Q. Tool, J. Res. Natl. Bur. Std. 3, 619 (1929) RP112.
    [Crossref]

1961 (1)

1954 (1)

W. S. Rodney and R. J. Spindler, J. Res. Natl. Bur. Std. 53, 185 (1954).
[Crossref]

1929 (1)

L. W. Tilton and A. Q. Tool, J. Res. Natl. Bur. Std. 3, 619 (1929) RP112.
[Crossref]

Heraeus, W. C.

W. C. Heraeus, 60 Jahre Quarzglas 25 Jahre Hochvakuumtechnik (GmbH, Hanau, Federal Republic of Germany, 1961). A review of this book has been published in J. Opt. Soc. Am. 54, 1067 (1964).

Rodney, W. S.

W. S. Rodney and R. J. Spindler, J. Res. Natl. Bur. Std. 53, 185 (1954).
[Crossref]

Rosberry, F. W.

F. W. Rosberry (private communication).

Schleter, J. W.

J. W. Schleter (private communication).

Sosman, R. B.

R. B. Sosman, The Properties of Silica (Chemical Catalog Company, Inc., New York, 1927).

Spindler, R. J.

W. S. Rodney and R. J. Spindler, J. Res. Natl. Bur. Std. 53, 185 (1954).
[Crossref]

Stavroudis, O. N.

Sutton, L. E.

Tilton, L. W.

L. W. Tilton and A. Q. Tool, J. Res. Natl. Bur. Std. 3, 619 (1929) RP112.
[Crossref]

Tool, A. Q.

L. W. Tilton and A. Q. Tool, J. Res. Natl. Bur. Std. 3, 619 (1929) RP112.
[Crossref]

J. Opt. Soc. Am. (1)

J. Res. Natl. Bur. Std. (2)

L. W. Tilton and A. Q. Tool, J. Res. Natl. Bur. Std. 3, 619 (1929) RP112.
[Crossref]

W. S. Rodney and R. J. Spindler, J. Res. Natl. Bur. Std. 53, 185 (1954).
[Crossref]

Other (5)

The author wishes to thank the aforementioned companies for providing specimens of these domestic brands of fused silica for measurement, and for granting the National Bureau of Standards permission to reveal the brand identifications of the data published in this paper. In no case does such identification imply recommendation or endorsement by the National Bureau of Standards, nor does it imply that any one brand is necessarily the best available.

F. W. Rosberry (private communication).

J. W. Schleter (private communication).

R. B. Sosman, The Properties of Silica (Chemical Catalog Company, Inc., New York, 1927).

W. C. Heraeus, 60 Jahre Quarzglas 25 Jahre Hochvakuumtechnik (GmbH, Hanau, Federal Republic of Germany, 1961). A review of this book has been published in J. Opt. Soc. Am. 54, 1067 (1964).

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Figures (4)

Fig. 1
Fig. 1

Refractive index of fused silica at 20°C. The dashed portion of the curve indicates region of strong OH absorption band. The dispersion equation (1) is valid for interpolation to five decimal places over the measured wavelength range.

Fig. 2
Fig. 2

Dispersive properties of SiO2 at 20°C. The quantity [(−dn/dλ)/(n−1)] defines the dispersion relative to deviation at any wavelength λ. The contribution to chromatic aberration decreases as the reciprocal relative dispersion [(−dn/dλ)/(n−1)]−1 increases.

Fig. 3
Fig. 3

Thermal coefficient of index of fused silica for a mean temperature of 25°C.

Fig. 4
Fig. 4

Comparison of current and previous NBS refractive-index values of fused silica at 20°C. The current values are represented by the line Δn=0.

Tables (2)

Tables Icon

Table I Computed refractive index of fused silica and residuals at 20°C for three specimens.

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Table II Interspecimen variation of the refractive index of fused silica at 20°C from different sources.

Equations (2)

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n 2 - 1 = 0.6961663 λ 2 λ 2 - ( 0.0684043 ) 2 + 0.4079426 λ 2 λ 2 - ( 0.1162414 ) 2 + 0.8974794 λ 2 λ 2 - ( 9.896161 ) 2 .
n 2 - 1 = 0.6961663 λ 2 λ 2 - ( 0.0684043 ) 2 + 0.4079426 λ 2 λ 2 - ( 0.1162414 ) 2 + 0.8974794 λ 2 λ 2 - ( 9.896161 ) 2 ,