Authors: Yum, H.N.; Hemmer, P.R.; Tripathi, Renu; Shahriar, M.S.

Source: Journal of Holography and Speckle, Volume 5, Number 2, August 2009 , pp. 197-209(13)

Publisher: American Scientific Publishers

Abstract:

In this paper, we present the coupled-wave analysis for multiple thick holographic gratings for optical beam combining. Starting with the basic model of incoherently superimposed multiple gratings used to form the beam-combiner, we derive equations that describe wave propagation in a holographic substrate containing angular multiplexed gratings with either sinusoidal refractive index or absorption modulation including the off-Bragg matched condition. Numerical results are presented for multiple thick holographic gratings in three different geometries: the beam-splitter mode, the beam-combiner mode, and the cross-coupled mode. The effect of non-equal beam intensities and phased angle variation on the efficiency of beam combiner have been investigated. Experiment is performed to create an efficient six beam splitter-combiner using a thick photopolymer based holographic material. The experimental measurement for efficiency in beam combining compares well with the predicted value from our theoretical model.

Keywords: BEAM COMBINER; HOLOGRAPHY; HOLOGRAPHIC MULTIPLEXING; COUPLED-MODE THEORY

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jhs.2009.1001

Publication date: 2009-08-01

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• The growing interest and activity in the fields of holography and speckle require a forum for rapid dissemination of important results. Journal of Holography and Speckle (JOHAS) is that international forum which offers scientists and engineers timely, peer-reviewed research in these fields. Journal of Holography and Speckle publishes original rapid communications, full research papers and timely state-of-the-art reviews (with author's biography and photo) encompassing the fundamental and applied research in all areas of holography, and speckle.
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