Boubekraoui, AyoubBeirow, FriederGraf, ThomasAbdou Ahmed, Marwan2024-11-132024-11-1320221432-06490946-21711912223023http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-152678http://elib.uni-stuttgart.de/handle/11682/15267http://dx.doi.org/10.18419/opus-15248We report on the first demonstration of an intra-cavity spectral beam combining of two fundamental-mode laser beams generated by a dual Yb:YAG thin-disk resonator. The two thin-disk lasers (TDLs) were operated at the two slightly different wavelengths of 1028 nm and 1032 nm. A resonant diffraction grating waveguide structure was used as common spectral stabilizer and combiner. An average power exceeding 200 W with close to diffraction-limited beam quality (M2<1.3) was obtained with the presented approach.eninfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/4.0/620article2024-11-02