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Proceedings Paper

Wavefront reconstruction using computer-generated holograms
Author(s): Christian Schulze; Daniel Flamm; Oliver A. Schmidt; Michael Duparré
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Paper Abstract

We propose a new method to determine the wavefront of a laser beam, based on modal decomposition using computer-generated holograms (CGHs). Thereby the beam under test illuminates the CGH with a specific, inscribed transmission function that enables the measurement of modal amplitudes and phases by evaluating the first diffraction order of the hologram. Since we use an angular multiplexing technique, our method is innately capable of real-time measurements of amplitude and phase, yielding the complete information about the optical field. A measurement of the Stokes parameters, respectively of the polarization state, provides the possibility to calculate the Poynting vector. Two wavefront reconstruction possibilities are outlined: reconstruction from the phase for scalar beams and reconstruction from the Poynting vector for inhomogeneously polarized beams. To quantify single aberrations, the reconstructed wavefront is decomposed into Zernike polynomials. Our technique is applied to beams emerging from different kinds of multimode optical fibers, such as step-index, photonic crystal and multicore fibers, whereas in this work results are exemplarily shown for a step-index fiber and compared to a Shack-Hartmann measurement that serves as a reference.

Paper Details

Date Published: 6 February 2012
PDF: 10 pages
Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82360C (6 February 2012); doi: 10.1117/12.906214
Show Author Affiliations
Christian Schulze, Friedrich-Schiller-Univ. Jena (Germany)
Daniel Flamm, Friedrich-Schiller-Univ. Jena (Germany)
Oliver A. Schmidt, Max Planck Institute for the Science of Light (Germany)
Michael Duparré, Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 8236:
Laser Resonators, Microresonators, and Beam Control XIV
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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