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Optical Engineering

Holographic Optical System For Aberration Corrections In Laser Doppler Velocimetry
Author(s): Richard C. Kim; Steven K. Case; Harold J. Schock
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Paper Abstract

An optical system containing multifaceted holographic optical elements (HOEs) was constructed to correct for aberrations introduced by a nonflat window in NASA laser Doppler velocimetry (LDV) experiments in an internal combustion engine. For these experiments, two green beams separated by 82 mm in a vertical plane and two blue beams separated by 82 mm in a horizontal plane were brought into coincident focus inside a thick walled sapphire cylinder. The focal power needed to bring these beams to a common focus and the aberration correction required by the presence of the cylinder were built into the holographic elements. A modular optical breadboard system was configured to fabricate, test, and use the custom-made HOEs. Additional HOEs were also fabricated to provide aberration correction and color separation for the multi-spectral output waves emerging from the focal volume. Compensation for the birefringence of a thick sapphire cylindrical window in the experiments was also accomplished. A general system such as we have built is useful wherever high efficiency, localized optical correction of wavefront errors is needed in LDV or other optical experiments.

Paper Details

Date Published: 1 August 1985
PDF: 5 pages
Opt. Eng. 24(5) 245786 doi: 10.1117/12.7973575
Published in: Optical Engineering Volume 24, Issue 5
Show Author Affiliations
Richard C. Kim, University of Minnesota (United States)
Steven K. Case, University of Minnesota (United States)
Harold J. Schock, NASA/Lewis Research Center (United States)

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