Generation, superposition, and separation of Gauss-Hermite modes by means of DOEs

Michael Rudolf Duparre; Vladimir S. Pavelyev; Barbara Luedge; Ernst-Bernhard Kley; Victor A. Soifer; Richard M. Kowarschik

doi:10.1117/12.310573

18 June 1998 Generation, superposition, and separation of Gauss-Hermite modes by means of DOEs

Michael Rudolf Duparre, Vladimir S. Pavelyev, Barbara Luedge, Ernst-Bernhard Kley, Victor A. Soifer, Richard M. Kowarschik

Author Affiliations +

Proceedings Volume 3291, Diffractive and Holographic Device Technologies and Applications V; (1998) https://doi.org/10.1117/12.310573
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

Novel Diffractive Optical Elements of MODAN-type open up new promising potentialities of solving the tasks of generation, transformation, superposition and subsequent separation again of different transversal laser modes with high efficiency. We present for the first time a MODAN capable of transforming a Gaussian TEM₀₀ input beam into a unimodal Gauss-Hermite (GH) (1,0) complex amplitude distribution. Now we present new results achieved by combining several MODANs in one optical set-up: The aim of these investigations is to transform a single TEM₀₀ input laser beam into several partial beams, each of them described by a different unimodal GH (n,m) mode structure. After separately modulating these partial beams in time, and subsequent superposing them to again one beam by means of a conventional beamsplitter, this unified multimode beam is permitted to propagate in space. Following that, an `analyzing' MODAN is applied to this transversal multimode beam--a diffractive element which is capable of realizing a spatial modal decomposition of an illuminating beam. For the investigations to be presented here, we restricted ourselves to two unimodal beams and selected as transforming MODANs one element of TEM₀₀-to-GH (1,0) type described and one of TEM₀₀-to-GH (0,1) type. The analyzing MODAN was calculated as a phase-only element using the crossed- gratings method and manufactured with the same technology like the two other elements. Theoretical as well as first experimental results demonstrate promising perspectives for the selected concept.

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Michael Rudolf Duparre, Vladimir S. Pavelyev, Barbara Luedge, Ernst-Bernhard Kley, Victor A. Soifer, and Richard M. Kowarschik "Generation, superposition, and separation of Gauss-Hermite modes by means of DOEs", Proc. SPIE 3291, Diffractive and Holographic Device Technologies and Applications V, (18 June 1998); https://doi.org/10.1117/12.310573

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