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Ring-up-doped fiber for the generation of more than 600 W single-mode narrow-band output at 1018 nm

: Palma-Vega, G.; Walbaum, T.; Heinzig, M.; Kuhn, S.; Hupel, C.; Hein, S.; Feldkamp, G.; Sattler, B.; Nold, J.; Haarlammert, N.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Optics Letters 44 (2019), Nr.10, S.2502-2505
ISSN: 0146-9592
Fraunhofer IOF ()

We present the amplification of a narrow-bandwidth signal at a wavelength of 1018 nm to a power exceeding 600 W with a stable output polarization state. The beam showed an excellent, nearly diffraction-limited beam quality. The high-power output could be realized using an in-house designed and fabricated fiber with a core-cladding diameter ratio of 32/260, ultra-low NA of 0.041, and ring-up doping. A seed source with high amplified spontaneous emission (ASE) suppression was also required, which was realized by a double-pass pre-amplifier with 13 W output power.