We present a free-running 80-MHz polarization-multiplexed solid-state dual-comb laser which delivers 1.8 Watts of average power with 110-fs pulse duration per comb. We apply this free-running dual-comb laser to picosecond ultrasonic measurements via a high-sensitivity pump-probe setup. We demonstrate ultrasonic measurements on thin-film samples, and compare our measurements to ones obtained with a pair of locked femtosecond lasers and x-ray diffraction measurements. Our data show that a free-running dual-comb laser is well-suited for picosecond ultrasonic measurements and thus it offers significant reduction in complexity and cost for this widely adopted non-destructive testing technique.
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