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High-power single-pass pumped diamond Raman oscillator

: Heinzig, M.; Walbaum, T.; Williams, R.J.; Kitzler, O.; Mildren, R.P.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Clarkson, W.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Solid State Lasers XXVII: Technology and Devices : 29 January - 1 February 2018, San Francisco, California, United States
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10511)
ISBN: 978-1-5106-1508-3
ISBN: 978-1-5106-1507-6
Paper 105111K, 6 S.
Conference "Solid State Lasers - Technology and Devices" <27, 2018, San Francisco/Calif.>
Conference "Laser Source Technologies, Industrial Lasers, and Applications" (LASE) <2018, San Francisco/Calif.>
Photonics West Conference <2018, San Francisco/Calif.>
Fraunhofer IOF ()

We present our recent advances on power scaling of a high-power single-pass pumped CVD-diamond Raman oscillator at 1.2 μm. The single pass scheme reduced feedback to the high gain fiber amplifier, which pumps the oscillator. The Yb-doped multi-stage fiber amplifier itself enables up to 1 kW output power at a narrow linewidth of 0.16 nm. We operate this laser in quasi-cw mode at 10% duty cycle and on-time (pulse) duration of 10 ms. With a maximum conversion efficiency of 39%, a maximum steady-state output power of 380 W and diffraction limited beam quality was achieved.