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We apply a spatially multiplexed low-noise solid-state dual-comb oscillator delivering two pulse trains at slightly different repetition rates for picosecond ultrasonics measurements. This novel laser delivers more than 2 W of average power per pulse train with 200fs pulses. We characterize the laser performance demonstrating its ultra-low relative timing jitter and relative intensity noise. By employing a high-sensitivity detection scheme we achieve <5e-5 pump-probe detection sensitivity in a single 12-ns-long trace with 250-fs delay resolution and an acquisition time of only 2 ms. We explain how to predict the measurement performance and optimize the data acquisition scheme accordingly.
Justinas Pupeikis,Wenxiang Hu,Benjamin Willenberg,Christopher R. Phillips, andUrsula Keller
"Efficient picosecond ultrasonics with a single-cavity dual-comb laser", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2649156
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Justinas Pupeikis, Wenxiang Hu, Benjamin Willenberg, Christopher R. Phillips, Ursula Keller, "Efficient picosecond ultrasonics with a single-cavity dual-comb laser," Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2649156