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Proceedings Paper

2.1 kW single mode continuous wave monolithic fiber laser
Author(s): Andrea Rosales-Garcia; Hideaki Tobioka; Kazi Abedin; Hao Dong; Zoltán Várallyay; Aron Szabo; Thierry Taunay; Sean P. Sullivan; Clifford Headley
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Paper Abstract

A robust, alignment-free monolithic 2.1 kW single-mode continuous wave fiber laser, operating at 1083 nm is demonstrated. The laser is pumped with commercial fiber pigtailed multimode diodes through all-fiber pump-signal power combiners in a MOPA architecture. The oscillator was formed with high reflector and output coupler fiber Bragg gratings written in 11/200 μm (mode field/cladding diameter) single-mode fiber. The gain medium was a 19m OFS commercial 11/200 μm double clad Yb-doped fiber (DCY). Pump light was coupled to the oscillator using two 11/200 μm pump-signal power combiners (PSC). A total of 20 commercially available 58W pump diodes at 915 nm were used to generate 800W of signal, as measured before the amplifier. The Raman power after the oscillator was more than 60 dB below the signal power. The amplifier was built using 13 m of 14/200 µm DCY and two (18+1)x1 PSC combiners with more than 95% pump and signal light transmission. A total of 2 kW of power was used to bi-directionally pump the amplifier. The output was measured after 3 m 14/200 μm fiber, and 10 m 100/360 μm delivery cable. Total signal output power was 2.1 kW, corresponding to an amplifier slope efficiency of 77%. The Raman power is more than 30 dB below the signal power. At maximum power, no modal instabilities, thermal effects, nor power rollover were observed. With higher power pumps, it is predicted that a power level of 2.6 kW can be achieved with the Raman level below 20 dB.

Paper Details

Date Published: 4 March 2015
PDF: 6 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441G (4 March 2015); doi: 10.1117/12.2077619
Show Author Affiliations
Andrea Rosales-Garcia, OFS Labs. (United States)
Hideaki Tobioka, Furukawa Electric Co., Ltd. (Japan)
Kazi Abedin, OFS Labs. (United States)
Hao Dong, OFS Labs. (United States)
Zoltán Várallyay, Furukawa Electric Institute of Technology Ltd. (Hungary)
Aron Szabo, Furukawa Electric Institute of Technology Ltd. (Hungary)
Thierry Taunay, OFS Labs. (United States)
Sean P. Sullivan, OFS Labs. (United States)
Clifford Headley, OFS Labs. (United States)

Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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