Holographic optical beam combining, splitting and cross-coupling: Numerical analysis and experimental investigation

H. N. Yum, P. R. Hemmer, RenuTripathi, Selim M Shahriar

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)197-209
Number of pages13
JournalJournal of Holography and Speckle
Volume5
Issue number2
DOIs
StatePublished - Aug 1 2009

Keywords

  • Beam combiner
  • Coupled-mode theory
  • Holographic multiplexing
  • Holography

ASJC Scopus subject areas

  • Engineering(all)
  • Atomic and Molecular Physics, and Optics

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