Intra-cavity wavelength multiplexing of high-brightness thin-disk laser beams

Abstract

AbstractWe 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 ( $$M^2<1.3$$ M 2 < 1.3 ) was obtained with the presented approach.