Dual-comb spectroscopy provides a marked advantage over single-comb techniques for molecular fingerprinting

particularly in terms of scanning speed. The single-cavity dual-comb system is a simpler approach to dual-comb operation. This system utilized a single free-running oscillator to generate both combs

eliminating the complex setups with multiple lasers. Here

we report a high-power deep ultraviolet (DUV) dual comb driven by a thin-disk single-cavity (TDSC) Yb:YAG dual-comb laser. A TDSC Yb:YAG oscillator generates 2 comb beams with repetition rates near 76 MHz

differing by a few kilohertz and tunable by adjusting one cavity arm. Both combs operate at a central wavelength of 1

030 nm with pulse durations of 431 and 411 fs

respectively

and achieve average output powers of 5 W each. We employed the TDSC as a light source for a ranging system

demonstrating a measurement difference accuracy of 1.23 μm for a target at 6.5 m with an average acquisition time of 330 ms. To extend the dual comb to DUV region

we generated the second and fourth harmonics using LBO and BBO crystals

respectively

with conversion efficiencies exceeding 40% and 10% for both comb beams. With over 300 mW of power at 258 nm for each comb

we successfully demonstrated DUV dual-comb operation with a frequency difference of 20 kHz. This represents the first DUV dual comb generated by a TDSC laser. Finally

we discussed the prospect of extending the dual-comb range to extreme UV and terahertz dual combs based on the TDSC Yb:YAG laser platform.