Spatial Beam Self-Cleaning in Tapered Yb-Doped GRIN Multimode Fiber With Decelerating Nonlinearity Article Swipe

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Multi-mode optical fiber Optics Laser beam quality Materials science Optoelectronics Fiber laser Beam (structure) Amplifier Polarization-maintaining optical fiber Laser Optical fiber Physics Fiber optic sensor Laser beams CMOS

Alioune Niang , D. Modotto , Alessandro Tonello , Fabio Mangini , Umberto Minoni , Mario Zitelli , Marc Fabert , Mesay Addisu Jima , O. N. Egorova , Andrey E. Levchenko , S. L. Semjonov , Denis S. Lipatov , Sergey A. Babin , Vincent Couderc , S. Wabnitz ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.1109/jphot.2020.2979938 · OA: W3012431366

We experimentally demonstrate spatial beam self-cleaning in an Yb-doped graded-index multimode fiber taper, both in passive and active configurations. The input laser beam at 1064 nm was injected for propagation from the small to the large core side of the taper, with laser diode pumping in a counterdirectional configuration. The Kerr effect permits to obtain high-beam quality amplification with no accompanying frequency conversions. As a result, our nonlinear taper amplifier may provide an important building block for multimode fiber lasers and amplifiers.