High-brightness power delivery for fiber laser pumping: simulation and measurement of low-NA fiber guiding

Yanson, D.A.; Levy, Moshe; Peleg, Ophir; Rappaport, Noam; Shamay, Moshe; Dahan, Nir; Klumel, Genady; Berk, Yuri; Baskin, Ilya

doi:10.1117/12.2079357

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2018

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“…The most outstanding advantage of tandem pumping is that through first pumping conversion, the brightness of pumping source is significantly increased, which makes it possible to achieve high power pumping source with limited output brightness of laser diode. Nevertheless, due to the recent development of laser diode technology, the pumping brightness has kept on rising with each passing year [3,4]. Therefore, laser diode direct pumping has become a competitive alternative for high energy laser.…”

Section: Introductionmentioning

confidence: 99%

Directly diode and bi-directional pumping 6 kW continuous-wave all-fibre laser

Xiao¹,

Li²,

Huang³

et al. 2018

Laser Phys.

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In this paper, a 6 kW continuous-wave all-fiber laser by direct 975 nm diode pumping is reported. The unique part of this system is the usage of non-wavelength-stabilized laser diodes in a bidirectional pumping configuration. The bidirectional pumping configuration not only increases the pumping power, but also shortens the fiber length and thus, restricts the nonlinear Raman effect. The fiber laser emits a maximum output power of 6020 W at a wavelength of 1070.1 nm without reaching the Raman threshold. With a corresponding optical-to-optical efficiency of 76.5%, ASE and Raman suppression of 25 dB could be reached. No transverse mode instability occurred during the experiment, and the power stability was measured to be within 2.5%@5260 W during a 1 h continuous operation test.

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Section: Introductionmentioning

confidence: 99%