Could anyone suggest some erbium fiber with a high damage threshold?

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Zolhizir bin Daud

Dear Nabil Belghachem

Actually i was far from your field. But anyway i believe there are much Er and Yb supplier and manufacturer from China. Try looking at there with cheaper price and the quality is not bad. Good luck.

Best Regard's

Zolhizir bin daud

Thomas Schönau

Dear Nabil Belghachem,

I can recommend LMA (large mode area) fibers for high power applications. Suppliers are for example Nufern, nLight and CorActive.

Good luck and best regards