Wilson, Derrek J.Summers, Adam M.Zigo, StefanDavis, BrandinRobatjazi, Seyyed-JavadPowell, Jeffery A.Rolles, DanielRudenko, ArtemTrallero-Herrero, Carlos A.2023-12-072023-12-072019-04-12https://hdl.handle.net/2097/44032For the last several decades, the wavelength range accessible for strong-field, few-cycle studies has remained limited to the visible, near infrared and mid-wave infrared regimes. In particular, sources in the long-wave infrared have been lacking. We report the development of a 1 kHz, few-cycle laser source with up to a 9 μm central wavelength and gigawatt peak powers. When focused, this source can ionize gas targets, which we demonstrate here through the ionization of atomic xenon at wavelengths ranging from 5 μm to 9 μm. This opens up new opportunities for fundamental atomic and molecular physics, enabling experimental tests of strong-field ionization theories in the extreme long-wavelength, few-cycle limit and the direct excitation of vibrational transitions in organic molecules.Creative Commons Attribution 4.0 International Licensehttps://creativecommons.org/licenses/by/4.0/Text