Highly-Stable 20/400 Yb-Doped Large-Mode-Area Fiber with 3kW Laser Output Power

摘要

We report on a 3kW-level 20/400 Yb-doped aluminophosphosilicate fiber with ultra-low photodarkening and mode instability. The fiber laser was kept at ~2.1kW output for over 500 minutes with power degradation less than 1.1%.