6 February 2012 Wavefront reconstruction using computer-generated holograms
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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.
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Christian Schulze, Christian Schulze, Daniel Flamm, Daniel Flamm, Oliver A. Schmidt, Oliver A. Schmidt, Michael Duparré, Michael Duparré, "Wavefront reconstruction using computer-generated holograms", Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82360C (6 February 2012); doi: 10.1117/12.906214; https://doi.org/10.1117/12.906214
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