We recently published an article in Applied Optics on our 243.1 nm laser system that was featured as an editor’s pick. Through significant development, this laser system is now capable of generating > 1 W of stable UV power over hour long time scales. We are able to control the frequency of this radiation precisely, enabling 2-photon excitation of the 1S-2S transition in hydrogen. With this system, we plan to excite a large number of cyrogenic hydrogen atoms to the 2S state in hydrogen in a UV enhancement cavity, where we can then perform 2S-8D spectroscopy. Once this is complete, the powers built up in this deep UV enhancement cavity can be used to demonstrate two-photon laser cooling of hydrogen.
You can find the full version of the paper here