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1 August 2021 Spatial beam cleaning in mode-locked multimode fiber lasers
Christophe Moser, Ugur Tegin, Babak Rahmani, Eirini Kakkava, Demetri Psaltis
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Proceedings Volume 11825, Ultrafast Nonlinear Imaging and Spectroscopy IX; 118250Q (2021) https://doi.org/10.1117/12.2594838
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States
Abstract
We propose and demonstrate the use of multimode fibers (MMF) inside a laser cavity as a new path to generate spatiotemporal modelocked pulses with high beam quality and high energy. Prior to our work, MMFs in optical cavities resulted in the generation of low-quality output beam profiles by spatiotemporal mode-locking. Here we present a versatile approach to reach high energy per pulse directly in the mode-locked MMF oscillator with a near single-mode output beam profile. Our approach relies on spatial beam self-cleaning via the nonlinear Kerr effect inside the cavity achieved by controlling spatiotemporal pulse propagation with a dispersion-managed design. We demonstrate the versatility of our approach with Yb-doped and Er-doped multimode laser cavities which generate pulse energies of 24 nJ and 16 nJ, respectively. The high peak power reached in the MMF within the cavity induced a Kerr self-beam cleaning which produced a near Gaussian mode output (M2<1.13).
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Christophe Moser, Ugur Tegin, Babak Rahmani, Eirini Kakkava, and Demetri Psaltis "Spatial beam cleaning in mode-locked multimode fiber lasers", Proc. SPIE 11825, Ultrafast Nonlinear Imaging and Spectroscopy IX, 118250Q (1 August 2021); https://doi.org/10.1117/12.2594838
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KEYWORDS
Mode locking
Multimode fibers
Fiber lasers
Laser resonators
Oscillators
Laser beam propagation
Optical resonators
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