All-Glass Fiber Amplifier Pumped by Ultra-High Brightness Pumps
MASSACHUSETTS INST OF TECH LEXINGTON LEXINGTON United States
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We investigate high brightness pumping of multi-kW fiber amplifier in a bi-directional pumping configuration. Each pump outputs 2 kW in a 200 m, 0.2 NA multi-mode fiber. Specialty gain fibers, with 17 m MFD and 5-dBmeter pump absorption, have been developed. The maximum fiber amplifier output power is 2550 W, limited by multi-mode instability, with 90 O-O efficiency and M2 1.15. The fiber amplifier linewidth is 12 GHz. We also present kW fiber amplifier results using gain fiber with metalized fiber coating.
- Electrical and Electronic Equipment