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Proceedings Paper

Holographic precompensation for one-way transmission of diffraction-limited beams through diffusing media
Author(s): Anpei Pan; Michel E. Marhic
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Paper Abstract

A new method to deliver high-quality laser beams through multimode optical fibers, based on the principle of phase conjugation generated by a hologram, is investigated. The delivery process is divided into two steps. In step 1, a hologram, which records the distorted output from the fiber, is made with the aid of a self-pumped phase-conjugating crystal. In step 2 the laser beam is first directed to the hologram, which gives the laser beam a phase precompensation, and is then coupled into the fiber. A clean wave with diffraction-limited quality is obtained at the other end of the fiber. The experimental configuration is almost the same as for an ordinary delivery system, except that the lens which couples the laser beam into the fiber is replaced by a hologram; some energy is lost if the hologram is not very efficient. The beam pattern of the final output could be one of any desired shape such as plane wave, spherical wave or Gaussian beam. Experimental results demonstrating diffraction- limited linearly polarized output are presented, and some limitations are discussed.

Paper Details

Date Published: 1 July 1991
PDF: 9 pages
Proc. SPIE 1461, Practical Holography V, (1 July 1991); doi: 10.1117/12.44705
Show Author Affiliations
Anpei Pan, Northwestern Univ. (United States)
Michel E. Marhic, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 1461:
Practical Holography V
Stephen A. Benton, Editor(s)

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