2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers.
We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a large mode area photonic crystal fiber. The four output beams of the amplifier chains are spectrally (incoherent) combined using a polarization-independent dielectric reflective diffraction grating to form an output beam of 2 kW continuous-wave optical power with good beam quality (M(2)x = 2.0, M(2)y = 1.8).
Wirth
C
C
Friedrich-Schiller University, Institute of Applied Physics, Jena, Germany. christian.wirth@iof.fraunhofer.de
Schmidt
O
O
Tsybin
I
I
Schreiber
T
T
Peschel
T
T
Brückner
F
F
Clausnitzer
T
T
Limpert
J
J
Eberhardt
R
R
Tünnermann
A
A
Gowin
M
M
ten Have
E
E
Ludewigt
K
K
Jung
M
M