Abstract

In order to increase the precision of visual settings with the class of instruments employing the Sénarmont compensator, two types of half-shade eyepieces have been utilized. The first is the biquartz, placed between the quarter-wave plate and analyzer, which rotates the plane of polarization by a fixed amount in opposite directions on the two sides of the field. The second consists of a single thin plate of birefringent material such as quartz placed before the quarter-wave plate and arranged to cover half of the field. The dividing line is made to appear very narrow by employing the principle used in the Lippich prism, namely, that if both sides of the edge are illuminated by the full cone of rays the edge will tend to disappear. The theory of the optimum half-shade angle has been applied to determine the thickness of the plate in each type of eyepiece.

© 1959 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. S. Inoué and C. J. Koester, J. Opt. Soc. Am. 49, 556 (1959), preceding paper.
    [Crossref]
  2. A. A. Lebedeff, Rev. opt. 9, 385 (1930).
  3. F. H. Smith, Research 8, 385 (1955).
  4. H. G. Jerrard, J. Opt. Soc. Am. 38, 35 (1948);J. Opt. Soc. Am. 44, 289 (1954).
    [Crossref]
  5. F. H. Smith, Nature 173, 362 (1954).
    [Crossref]
  6. O. Lummer, Z. Instrumentenk. 15, 293 (1895).
  7. D. B. Brace, Phys. Rev. 18, 70 (1904);Phil. Mag. 7, 320 (1904).
  8. J. Dyson, J. Opt. Soc. Am. 47, 557 (1957).
    [Crossref]
  9. E. P. Clancy, J. Opt. Soc. Am. 42, 357 (1952).
    [Crossref]
  10. H. Schulz, Handbuch der Experimental Physik, edited by W. Wien and F. Harms (Akademische Verlagsgesellschaft M.B.H., Leipzig, 1928), Vol. 18, pp. 425, 426.
  11. G. Bruhat, Traité de polarimétrie (La Revue d’optique théorique et instrumentale, Paris, 1930), pp. 75–78.
  12. C. V. Kent, J. Opt. Soc. Am. 26, 450 (1936).
    [Crossref]

1959 (1)

1957 (1)

1955 (1)

F. H. Smith, Research 8, 385 (1955).

1954 (1)

F. H. Smith, Nature 173, 362 (1954).
[Crossref]

1952 (1)

1948 (1)

1936 (1)

1930 (1)

A. A. Lebedeff, Rev. opt. 9, 385 (1930).

1904 (1)

D. B. Brace, Phys. Rev. 18, 70 (1904);Phil. Mag. 7, 320 (1904).

1895 (1)

O. Lummer, Z. Instrumentenk. 15, 293 (1895).

Brace, D. B.

D. B. Brace, Phys. Rev. 18, 70 (1904);Phil. Mag. 7, 320 (1904).

Bruhat, G.

G. Bruhat, Traité de polarimétrie (La Revue d’optique théorique et instrumentale, Paris, 1930), pp. 75–78.

Clancy, E. P.

Dyson, J.

Inoué, S.

Jerrard, H. G.

Kent, C. V.

Koester, C. J.

Lebedeff, A. A.

A. A. Lebedeff, Rev. opt. 9, 385 (1930).

Lummer, O.

O. Lummer, Z. Instrumentenk. 15, 293 (1895).

Schulz, H.

H. Schulz, Handbuch der Experimental Physik, edited by W. Wien and F. Harms (Akademische Verlagsgesellschaft M.B.H., Leipzig, 1928), Vol. 18, pp. 425, 426.

Smith, F. H.

F. H. Smith, Research 8, 385 (1955).

F. H. Smith, Nature 173, 362 (1954).
[Crossref]

J. Opt. Soc. Am. (5)

Nature (1)

F. H. Smith, Nature 173, 362 (1954).
[Crossref]

Phys. Rev. (1)

D. B. Brace, Phys. Rev. 18, 70 (1904);Phil. Mag. 7, 320 (1904).

Research (1)

F. H. Smith, Research 8, 385 (1955).

Rev. opt. (1)

A. A. Lebedeff, Rev. opt. 9, 385 (1930).

Z. Instrumentenk. (1)

O. Lummer, Z. Instrumentenk. 15, 293 (1895).

Other (2)

H. Schulz, Handbuch der Experimental Physik, edited by W. Wien and F. Harms (Akademische Verlagsgesellschaft M.B.H., Leipzig, 1928), Vol. 18, pp. 425, 426.

G. Bruhat, Traité de polarimétrie (La Revue d’optique théorique et instrumentale, Paris, 1930), pp. 75–78.

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (2)

F. 1
F. 1

The extinction factor for a typical AO Baker Interference Microscope, using the 10×, 40×, and 100× shearing systems. The 40× SH* curve was obtained when the system was not adjusted for optimum performance. Since the fraction of the full condenser aperture is easily determined by viewing the back aperture of the objective, this quantity has been used as the abscissa.

F. 2
F. 2

(a) The Lippich half-shade system, illustrating how the parallelogram shape of the Lippich prism allows the full cone of rays to illuminate each side of the dividing edge. (b) The Brace-type inclined quartz half-shade eyepiece. The inclined surfaces of the quartz plate serve the same purpose as those of the Lippich prism.