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Continuous-wave cascaded second Stokes diamond Raman laser at 1477 nm

: Heinzig, M.; Palma-Vega, G.; Yildiz, B.; Walbaum, T.; Schreiber, T.; Tünnermann, A.


Optics Letters 46 (2021), Nr.5, S.1133-1136
ISSN: 0146-9592
ISSN: 1539-4794
Fraunhofer IOF ()
continuous wave; diffraction-limited beams; fiber lasers; high brightness; intracavities

We report a high brightness cascaded Stokes diamond Raman laser with a diffraction limited beam quality pumped by an Yd-doped fiber laser. The Raman laser operated at 1477 nm and reached an output power of 63 W with 214 W pump power in continuous-wave mode. Conversion efficiency over 30% was achieved using a single pump pass concentric cavity that was highly resonant at the first Stokes and had high outcoupling at the second Stokes (45%). Thermal limitations were investigated as well as the temporal behavior of the first and second Stokes intra-cavity power.