Nowadays in atomic physics frequency-quadrupled diode lasers are commonly used for accessing DUV wavelengths. They produce a lot of power and have narrow linewidths, but are very expensive (>> 100k€). Here is a chart from one manufacturer that shows commonly accessed transitions: https://www.toptica.com/fileadmin/Editors_English/15_downloa...
In the paper the authors only demonstrate pulsed operation of a bare laser diode. To make it usable for atomic physics, they would have to achieve continuous-wave operation with feedback from an external cavity. This might be pretty difficult to do.
In the paper the authors only demonstrate pulsed operation of a bare laser diode. To make it usable for atomic physics, they would have to achieve continuous-wave operation with feedback from an external cavity. This might be pretty difficult to do.