  For the first time to our knowledge, a dual-comb laser based on thin-disk
technology and its application to direct frequency comb spectroscopy are
presented. The peak power (0.6 MW) and the average power (12 W) of our Yb:YAG
thin-disk dual-comb system are more than one-order-of-magnitude higher than in
any previous systems. The scheme allows easy adjustment of the repetition
frequency difference during operation. A time-domain signal recorded over 10
{\mu}s without any active stabilization was sufficient to resolve individual
comb lines after Fourier transformation. The demonstration should enable a
wider adoption of dual-comb systems towards practical applications in research
laboratories. Its simplicity and compactness especially for the realization of
tri- and multi-comb systems and conversion into the still poorly covered UV and
VUV ranges makes it a promising next-generation technology.
