Alexey A. Wolf,1 Alexey G. Kuznetsov,1 Olga N. Egorova,2 Sergey L. Semjonov,2 Sergey A. Babin1
1Institute of Automation and Electrometry of the SB RAS (Russian Federation) 2Dianov Fiber Optics Research Ctr., Prokhorov General Physics Institute RAS (Russian Federation)
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We report on the investigation of a 7-core Yb-doped fiber laser based on femtosecond pulse written fiber Bragg gratings. The fabricated FBG arrays are used as a complex high-reflective mirrors, whereas output coupling is provided by ~4% Fresnel reflection from the normally cleaved end of the fiber. At cladding pumping by a 976-nm laser diode, the cores generate independently with linear total power growth up to 33 W at 50 W pump power. The individual generation spectra slowly broaden to ~0.15 nm whereas net spectrum at maximum power is ~0.2 nm broad thus demonstrating high-power narrowband generation in multicore active fiber.
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Alexey A. Wolf, Alexey G. Kuznetsov, Olga N. Egorova, Sergey L. Semjonov, Sergey A. Babin, "7-core Yb-doped fiber laser with femtosecond pulse inscribed fiber Bragg gratings," Proc. SPIE 12310, Advanced Lasers, High-Power Lasers, and Applications XIII, 123101A (28 December 2022); https://doi.org/10.1117/12.2644066