Simple Coherent Polarization Manipulation Scheme for Generating High Power Radially Polarized Beam

Details Simple Coherent Polarization Manipulation Scheme for Generating High Power Radially Polarized Beam Simple Coherent Polarization Manipulation Scheme for Generating High Power Radially Polarized Beam

2007-07-24

arxiv.org/abs/0707.3503v1

Physics

Optics

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Scientific paper

10.1364/OE.15.014251

We present a simple novel scheme that converts a Gaussian beam into an approximated radially polarized beam using coherent polarization manipulation together with Poynting walk-off in birefringent crystals. Our scheme alleviates the interferometric stability required by previous schemes that implemented this coherent mode summation using Mach-Zehnder-like interferometers. A symmetrical arrangement of two walk-off crystals with a half-wave plate, allows coherence control even when the laser has short temporal coherence length. We generated 14 watts of radially polarized beam from an Ytterbium fiber laser, only limited by the available fiber laser power.

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