Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

Yun Ye; Xianfeng Lin; Xiaoming Xi; Hanwei Zhang; Xiaolin Wang; Jinyan Li; Xiaojun Xu

doi:10.1117/12.2654938

15 December 2022 Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser

Yun Ye, Xianfeng Lin, Xiaoming Xi, Hanwei Zhang, Xiaolin Wang, Jinyan Li, Xiaojun Xu

Author Affiliations +

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 1247849 (2022) https://doi.org/10.1117/12.2654938
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

A specially-designed active optical fiber with a constant cladding size and a saddle-shaped profile core is proposed and demonstrated, which called saddle-shaped core (SSC) Yb-doped fiber. The SSC fiber is manufactured through a conventional modified chemical vapor deposition (MCVD) process followed by post-processing of the fiber preforms. The fabricated SSC fiber possesses a large-core region (core/cladding diameter of ∼30/600 μm) at both fiber ends and a small-core region (core/cladding diameter of ∼20.8/600 μm) in the middle length. The output laser characteristics of this SSC fiber are proved through a monolithic high-power continuous-wave MOPA configuration, on the conditions of the co-pumping and counter-pumping manners. It shows that the output lasing powers of co-pumping and counter-pumping regimes are scaled up to ~1.8 kW and ~1.5 kW associated with ~83.3% and ~86.6% slope efficiency, respectively. Before the transverse mode instability (TMI) threshold, a good beam profile quality is measured to M2~1.4, and no evidence of stimulated Raman scattering (SRS) is observed. As far as we know, this is the first demonstration of saddleshaped fiber for kilowatt-level near-single-mode continuous-wave fiber lasers. By further optimizing the fiber design, a higher lasing power connected with near-diffraction-limited beam quality can be achieved in the future.

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Yun Ye, Xianfeng Lin, Xiaoming Xi, Hanwei Zhang, Xiaolin Wang, Jinyan Li, and Xiaojun Xu "Large mode area saddle-shaped core Yb-doped fiber enabled monolithic high-power, high-efficiency, near-diffraction-limited MOPA laser", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 1247849 (15 December 2022); https://doi.org/10.1117/12.2654938

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KEYWORDS

Fiber lasers

Continuous wave operation

Fiber amplifiers

Optical fibers

Manufacturing

Optical amplifiers

Raman scattering

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