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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 23, Iss. 11 — Jun. 1, 1984
  • pp: 1725–1729

Gradient-index optical systems in holographic endoscopy

G. von Bally, W. Schmidthaus, H. Sakowski, and W. Mette  »View Author Affiliations


Applied Optics, Vol. 23, Issue 11, pp. 1725-1729 (1984)
http://dx.doi.org/10.1364/AO.23.001725


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Abstract

Small limiting apertures of endoscopes cause gross speckles when using coherent light sources in holographic endoscopy. Thus, for a high optical signal-to-noise ratio, imaging systems with high numerical apertures and low f/Nos. are required, which under given geometrical constraints can be provided in particular by gradient-index rod lenses. For additional speckle reduction the limiting aperture has to be enlarged within the given outer diameter of the instrument. This can be achieved by using the same gradient-index rod lens for both imaging and illumination, so that no separate illuminating fiber bundle is necessary. Holographic recording problems due to reflections of the illuminating object beam from the end faces can be solved by appropriate positioning and shaping of the rod as well as by holographic subtraction.

© 1984 Optical Society of America

History
Original Manuscript: December 15, 1983
Published: June 1, 1984

Citation
G. von Bally, W. Schmidthaus, H. Sakowski, and W. Mette, "Gradient-index optical systems in holographic endoscopy," Appl. Opt. 23, 1725-1729 (1984)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-23-11-1725


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References

  1. D. Hadbawnik, Optik 45, 21 (1976).
  2. G. von Bally, Ed., Holography in Medicine and Biology (Springer, Berlin, 1979).
  3. G. von Bally, P. Greguss, Eds., Optics in Biomedical Sciences (Springer, Berlin, 1982).
  4. G. von Bally, “Otoscopic Investigations by Holographic Interferometry: a Fiber Endoscopic Approach Using a Pulsed Ruby Laser System,” in Optics in Biomedical Sciences, G. von Bally, P. Greguss, Eds. (Springer, Berlin, 1982), pp. 110–114.
  5. M. Francon, Laser Speckle and Applications in Optics (Academic, New York, 1979).
  6. R. J. Collier, C. B. Burckhardt, L. H. Lin, Optical Holography (Academic, New York, 1971).
  7. C. Sieger, “Suppression of Disturbing Light Reflexes in Holography Applied to Practical Recording Problems in Medicine and Technology,” in Optics in Biomedical Sciences, G. von Bally, P. Greguss, Eds. (Springer, Berlin, 1982), pp. 126–130.
  8. J. A. Gilbert, M. E. Schultz, A. J. Boehnlein, Exp. Mech. 22, 398 (1982). [CrossRef]
  9. O. J. Løkberg, “Speckle Techniques for Use in Biology and Medicine,” in Optics in Biomedical Sciences, G. von Bally, P. Greguss, Eds. (Springer, Berlin, 1982), pp. 144–153.

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