and here we have, both thulium and Ytterbium fiber

IPG Photonics Thulium Fiber Laser TLP-0.5-125-20 | eBay

End of fibre cable is covered to avoid inadvertent exposure to the invisible radiation. Special Warning: This unit is an industrial Laser with maximum output of 15W average, 10kW peak pulse. (duration 120nS), wave length 1700-2200nm (invisible). | eBay!

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