Abstract

A phase-contrast refractometer for measurements in the infrared has been constructed. The optical and mechanical arrangement is discussed and a brief description of the experimental procedure is given. A value for (n−1) of air of 0.00026834 was obtained for the 1.014-μ line of mercury. The standard deviation of the mean is ±0.7%.

© 1958 Optical Society of America

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References

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  1. E. Ingelstam, Nature 168, 960 (1951).
    [Crossref]
  2. E. Ingelstam, Arkiv. Fysik 6, 29 (1953).
  3. E. Djurle, Appl. Sci. Research B4 (1954).
  4. W. S. Rodney and E. Djurle, ReportOctober30, 1957, Institute of Optical Research, Stockholm 70, Sweden.
  5. B. Edlén, J. Opt. Soc. Am. 43, 339 (1953).
    [Crossref]
  6. R. Penndorf, J. Opt. Soc. Am. 47, 176 (1957).
    [Crossref]

1957 (1)

1954 (1)

E. Djurle, Appl. Sci. Research B4 (1954).

1953 (2)

B. Edlén, J. Opt. Soc. Am. 43, 339 (1953).
[Crossref]

E. Ingelstam, Arkiv. Fysik 6, 29 (1953).

1951 (1)

E. Ingelstam, Nature 168, 960 (1951).
[Crossref]

Djurle, E.

E. Djurle, Appl. Sci. Research B4 (1954).

W. S. Rodney and E. Djurle, ReportOctober30, 1957, Institute of Optical Research, Stockholm 70, Sweden.

Edlén, B.

Ingelstam, E.

E. Ingelstam, Arkiv. Fysik 6, 29 (1953).

E. Ingelstam, Nature 168, 960 (1951).
[Crossref]

Penndorf, R.

Rodney, W. S.

W. S. Rodney and E. Djurle, ReportOctober30, 1957, Institute of Optical Research, Stockholm 70, Sweden.

Appl. Sci. Research (1)

E. Djurle, Appl. Sci. Research B4 (1954).

Arkiv. Fysik (1)

E. Ingelstam, Arkiv. Fysik 6, 29 (1953).

J. Opt. Soc. Am. (2)

Nature (1)

E. Ingelstam, Nature 168, 960 (1951).
[Crossref]

Other (1)

W. S. Rodney and E. Djurle, ReportOctober30, 1957, Institute of Optical Research, Stockholm 70, Sweden.

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Figures (2)

Fig. 1
Fig. 1

Schematic diagram of the phase-contrast refractometer. (a) The light source L, the slits S1 and S2, mirrors M1 and M2, and the grating G form a monochromator. S2 serves as the entrance slit of the refractometer. (b) Refractometer: The optical path is indicated by the arrows. This is a side view as compared to part (a). (c) Sample cell: Part A and parts B are such that each may be evacuated separately.

Fig. 2
Fig. 2

The detector unit, D2 is a double aperature, D1 is passed in front of D2 in such manner as to alternately allow light to pass through the two slits of D2. The attenuators may be moved to adjust until both beams are of equal intensity. The cam C′ is attached to the same shaft as a sector disk producing a gating signal which is required for the amplifier.