Abstract

In order to balance the mitigation of transverse mode instability and stimulated Raman scattering effect in the high power fiber lasers, a specially designed Yb-doped fiber, named spindle-shaped Yb-doped fiber, was fabricated with a core/cladding diameter of 20/400 µm at both ends and 30/600 µm in the middle. Based on this fiber, an all-fiber laser oscillator was built and over 3 kW near-single-mode (${{\rm{M}}^2}$ factor ${\sim}{1.3}$) laser was achieved with an optical-to-optical conversion efficiency of 78.4%. While operating at the maximum power, the transverse mode instability is well mitigated and the stimulated Raman scattering effect is well suppressed (${\gt}\!{{34}}\;{\rm{dB}}$ lower than signal laser). Further power scaling is promising by optimizing the structure of the Yb-doped fiber.

© 2020 Optical Society of America

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Corrections

Lingfa Zeng, Xiaoming Xi, Yun Ye, Hanwei Zhang, Xiaolin Wang, Zhiyong Pan, Zefeng Wang, and Xiaojun Xu, "Near-single-mode 3 kW monolithic fiber oscillator based on a longitudinally spindle-shaped Yb-doped fiber: publisher’s note," Opt. Lett. 45, 5949-5949 (2020)
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-21-5949

16 October 2020: A typographical correction was made to p. 5795, left column.


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