| Autor: |
Muendel, Martin H., Farrow, Roger, Liao, Kai-Hsiu, Woll, Dirk, Luu, Johnny, Zhang, Chris, Morehead, James J., Segall, Jeff, Gregg, Jeff, Tai, Kuochou, Kharlamov, Boris, Yu, Hongbo, Myers, Lawrence |
| Zdroj: |
Proceedings of SPIE; February 2011, Vol. 7914 Issue: 1 p791431-791431-7 |
| Abstrakt: |
We report the development of fused-fiber pump and signal combiners. These combiners are enabling components of a ytterbium fiber-laser emitting 4 kW of 1080-nm radiation. The fiber-laser system consists of seven fiber laser modules and a 7:1 signal combiner. The laser modules are end-pumped by 90 915-nm JDSU L4 diode-lasers, yielding a nominal pump power of 900 W. The diode laser radiation is coupled into the laser fiber through a 91:1 fused-fiber pump combiner. The input fibers of this pump combiner are standard 105/125-um multimode fibers with an NA of 0.22. These fibers form a hexagonally packed fused-fiber bundle, which is tapered to match the cladding diameter of the laser fiber. Eighty-six percent of the light exiting the pump-combiner is emitted within an NA of 0.32, and all measurable power is emitted within an NA of 0.45. The typical insertion loss of the pump combiners is <1%. The high-brightness radiation of seven laser modules is combined into a single output fiber using a 7:1 fused-fiber signal combiner providing a total power of >4 kW in the single output beam. The beam parameter product of the combined output was 2.5 mm-mrad. The low insertion loss of < 2% indicates that the signal combiner is suitable to handle even higher laser powers. |
| Databáze: |
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