High-efficient kW-level single-mode ytterbium fiber lasers in all-fiber format with diffraction-limited beam at wavelengths in 1000-1030 nm spectral range

Nikolai Platonov; Oleg Shkurikhin; Valentin Fomin; Daniil Myasnikov; Roman Yagodkin; Anton Ferin; Alexey Doronkin; Ivan Ulyanov; Valentin Gapontsev

doi:10.1117/12.2547021

21 February 2020 High-efficient kW-level single-mode ytterbium fiber lasers in all-fiber format with diffraction-limited beam at wavelengths in 1000-1030 nm spectral range

Nikolai Platonov, Oleg Shkurikhin, Valentin Fomin, Daniil Myasnikov, Roman Yagodkin, Anton Ferin, Alexey Doronkin, Ivan Ulyanov, Valentin Gapontsev

Author Affiliations +

Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 1126003 (2020) https://doi.org/10.1117/12.2547021
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

The kW-level single-mode Yb fiber lasers at wavelengths in 1000 -1030nm spectral range with diffraction-limited beam and with direct diode pumping are remarkable high brightness and low quantum defect sources for tandem pumping of multi-kilowatt fiber and crystal laser systems. In this paper we present SM Yb fiber lasers in all-fiber format with powers 0.75kW, 0.90kW, 1.33kW and 1.40kW at 1007nm, 1010nm, 1018nm and 1030nm respectively with M² values of output beams < 1.1. These are the highest powers of single mode CW Yb fiber lasers at wavelengths near 1 micron to the best of our knowledge. The fiber oscillators with direct diode pumping are highly efficient and have optical slope efficiencies from 64% at 1007nm to 78% at 1018nm relative to total laser diode pump power. The fiber lasers have 3-5m output delivery cable terminated with a LC-8 connector in dependence on power level and MFD of output fiber. The pump and non-linear process (SRS and MI) limitations are discussed.

Conference Presentation

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Nikolai Platonov, Oleg Shkurikhin, Valentin Fomin, Daniil Myasnikov, Roman Yagodkin, Anton Ferin, Alexey Doronkin, Ivan Ulyanov, and Valentin Gapontsev "High-efficient kW-level single-mode ytterbium fiber lasers in all-fiber format with diffraction-limited beam at wavelengths in 1000-1030 nm spectral range", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126003 (21 February 2020); https://doi.org/10.1117/12.2547021

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