Generally speaking, ultraviolet light (UV light) is a virus's worst enemy.
By May, 2020, technologists were looking for ways to use UV light as treatment to eliminate SARS-CoV-2 from hosts.1) Columbia University researchers were investigating safe ways to use short-range UV to prevent airborne spread of coronavirus and influenza.2)
Excimer lamps emit UV at specific frequencies. Excimer Lamp at Wikipedia.
Excimer Lasers direct UV light for specific purposes in medical technology.Excimer Lasers at Wikipedia