Comb-Line-Resolved Spectroscopy of Acetylene Driven by a Free-Running Dual-Comb Thin-Disk Laser

Dual-comb systems are attractive sources for various applications like fast high-resolution spectroscopy [1] . Typically, such systems rely on the complex active stabilization of two independently generated asynchronous pulse trains. A simpler and promising alternative is the generation of the two pulse trains directly from a single laser cavity. As cavity components are shared, most of the noise in both pulse trains is correlated and cancels out in the beating process, allowing for dual-comb applications in free-running laser operation. Among various single-cavity dual-comb laser architectures, the dual-comb thin-disk laser (TDL) stands out by providing more than an order of magnitude higher average power, being highly attractive for nonlinear frequency conversion into the desired spectral range [2] . However, the increased noise level mainly induced by the turbulent water-cooling of the disk, severely challenges the suitability of dual-comb TDLs for high-resolution spectroscopic applications.