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Highly stable, high power hybrid fiber and Innoslab amplifier for narrow linewidth signals

: Cebeci, Pelin; Vera Mosquera, Jhon Jairo; Höfer, Marco; Fitzau, Oliver; Giesberts, Martin; Erben, Benjamin; Hoffmann, Hans-Dieter


Clarkson, W.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Solid State Lasers XXIX: Technology and Devices : 4-6 February 2020, San Francisco, California
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11259)
ISBN: 978-1-5106-3281-3
ISBN: 978-1-5106-3282-0
Paper 112590L, 7 pp.
Conference "Solid State Lasers - Technology and Devices" <29, 2020, San Francisco/Calif.>
Conference Paper
Fraunhofer ILT ()
fiber amplifiers; optical amplifiers; high power fiber amplifiers; resonators; fiber lasers

Based on our study of a high stability ultra-narrow linewidth fiber amplifier for the gravitational wave detector LISA, we have set up a hybrid fiber and Innoslab amplifier for further power scaling into <100 Watt regime. The fiber amplifier can provide a seed power of up to 8 W at 1064 nm and a linewidth <10 kHz. The booster stage consists of an in-band pumped Innoslab amplifier, which is pumped by stabilized laser diodes at 880 nm. An output power of 437 W has already been demonstrated with almost diffraction-limited beam quality. Further investigations of power stability and modal properties are currently ongoing.