Abstract

A Jamin interferometer was used to measure the thermal coefficient of the refractive index of water for sodium light (λ = 5893A) from -5°C to +25°C. From this was calculated the indextemperature curve over the same range. The results agree with those found by the Bureau of Standards for water within the experimental error, which is between 1 × 10<sup>-6</sup> and 2 × 10<sup>-6</sup> index unit per degree centigrade. No differences were found between samples of water from different sources, nor was any change observed in the same sample over periods of weeks. No anomalies or irregularities in behavior were found in the average <i>dn</i>/<i>dT</i>. The possibility of a small consistent difference between the <i>dn</i>/<i>dT</i><i>versus T</i> curves taken with rising and falling temperatures near 0°C is still under investigation.

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References

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  1. J. B. Hawkes and R. W. Astheimer, J. Opt. Soc. Am. 38, 617 (1948).
  2. L. W. Tilton, and J. K. Taylor, J. Research Nat. Bur. of Stand. 20, 419 (1938).
  3. J. Jamin, Comptes Rendus 43, 1193 (1856).
  4. L. Lorenz, Kgl. Danske Vid. Sels. Math.-Fys. Medd. (5)8, 220 (1869).
  5. E. E. Hall and A. R. Payne, Phys. Rev. 20, 253 (1927).

Astheimer, R. W.

J. B. Hawkes and R. W. Astheimer, J. Opt. Soc. Am. 38, 617 (1948).

Hall, E. E.

E. E. Hall and A. R. Payne, Phys. Rev. 20, 253 (1927).

Hawkes, J. B.

J. B. Hawkes and R. W. Astheimer, J. Opt. Soc. Am. 38, 617 (1948).

Jamin, J.

J. Jamin, Comptes Rendus 43, 1193 (1856).

Lorenz, L.

L. Lorenz, Kgl. Danske Vid. Sels. Math.-Fys. Medd. (5)8, 220 (1869).

Payne, A. R.

E. E. Hall and A. R. Payne, Phys. Rev. 20, 253 (1927).

Taylor, J. K.

L. W. Tilton, and J. K. Taylor, J. Research Nat. Bur. of Stand. 20, 419 (1938).

Tilton, L. W.

L. W. Tilton, and J. K. Taylor, J. Research Nat. Bur. of Stand. 20, 419 (1938).

Other (5)

J. B. Hawkes and R. W. Astheimer, J. Opt. Soc. Am. 38, 617 (1948).

L. W. Tilton, and J. K. Taylor, J. Research Nat. Bur. of Stand. 20, 419 (1938).

J. Jamin, Comptes Rendus 43, 1193 (1856).

L. Lorenz, Kgl. Danske Vid. Sels. Math.-Fys. Medd. (5)8, 220 (1869).

E. E. Hall and A. R. Payne, Phys. Rev. 20, 253 (1927).

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