Picosecond ultrasonics with a free-running dual-comb laser
Abstract
We present a free-running 80-MHz dual-comb polarization-multiplexed solid-state laser which delivers 1.8 W of average power with 110-fs pulse duration per comb. With a high-sensitivity pump-probe setup, we apply this free-running dual-comb laser to picosecond ultrasonic measurements. The ultrasonic signatures in a semiconductor multi-quantum-well structure originating from the quantum wells and superlattice regions are revealed and discussed. We further demonstrate ultrasonic measurements on a thin-film metalized sample and compare these measurements to ones obtained with a pair of locked femtosecond lasers. Our data show that a free-running dual-comb laser is well-suited for picosecond ultrasonic measurements and thus it offers a significant reduction in complexity and cost for this widely adopted non-destructive testing technique.
Keywords
Cite
@article{arxiv.2109.00457,
title = {Picosecond ultrasonics with a free-running dual-comb laser},
author = {Justinas Pupeikis and Benjamin Willenberg and Francois Bruno and Mike Hettich and Alexander Nussbaum-Lapping and Matthias Golling and Carolin P. Bauer and Sandro L. Camenzind and Abdelmjid Benayad and Patrice Camy and Bertrand Audoin and Christopher R. Phillips and Ursula Keller},
journal= {arXiv preprint arXiv:2109.00457},
year = {2021}
}