Next generation Yb-doped fibers for high-power, narrow-linewidth lasers

J. W. Nicholson; A. DeSantolo; R. S. Windeler; E. Monberg; V. Lukonin; J. Pincha; A. Hariharan; X. Xu; G. Williams; Z. Goldberg; A. Rosales-Garcia; P. Kristensen; D. Knight; D. J. DiGiovanni

doi:10.1117/12.2614611

4 March 2022 Next generation Yb-doped fibers for high-power, narrow-linewidth lasers

J. W. Nicholson, A. DeSantolo, R. S. Windeler, E. Monberg, V. Lukonin, J. Pincha, A. Hariharan, X. Xu, G. Williams, Z. Goldberg, A. Rosales-Garcia, P. Kristensen, D. Knight, D. J. DiGiovanni

Author Affiliations +

Proceedings Volume 11981, Fiber Lasers XIX: Technology and Systems; 119810R (2022) https://doi.org/10.1117/12.2614611
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

We report new Yb-doped gain fibers with approximately 20-μm core diameter and 400-μm cladding. These fibers have mode-field diameter greater than 19 μm, and increased higher-order-mode loss compared to conventional 19-μm modefield diameter fibers. The increased higher-order mode loss allows for high transverse-mode instability thresholds in fibers that also have large MFD and high absorption. A 21-μm fiber with 6.5 m operating length, was free from transverse-modal instabilities at 3.6 kW signal power and had 81% optical-optical efficiency. In narrow-linewidth amplifier experiments, the next-generation fiber with 21 μm fiber achieved 2.74 kW output power at 6 GHz linewidth, limited by pump power. This represents almost 2x increase in the ratio of power to signal linewidth compared to existing commercially available 19.5 μm MFD fibers, achieving 510 kW/GHz.

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Citation Download Citation

J. W. Nicholson, A. DeSantolo, R. S. Windeler, E. Monberg, V. Lukonin, J. Pincha, A. Hariharan, X. Xu, G. Williams, Z. Goldberg, A. Rosales-Garcia, P. Kristensen, D. Knight, and D. J. DiGiovanni "Next generation Yb-doped fibers for high-power, narrow-linewidth lasers", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 119810R (4 March 2022); https://doi.org/10.1117/12.2614611

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