Among their many applications, lasers are used in optical disk drives, laser printers, and barcode scanners; fiber-optic and free-space optical communication; laser surgery and skin treatments; cutting and welding materials; military and law enforcement devices for marking targets and measuring range and speed; and laser lighting displays in entertainment.
The skelkwank light was a technology which Tosevites first discovered in machines captured from the Race during the Race Invasion of Tosev 3 in the 1940s. With the help of Race POWs, they determined its workings and applications as best they could. Originally used for military purposes, skelkwank light also had uses in the fields of medicine and entertainment. By the close of the 20th century, skelkwank-based musical recording devices had completely replaced the old-fashioned phonograph.
The word skelkwank was of necessity borrowed from the Race's language, as no Tosevite tongue had a word to describe this alien technology. A ftaskelkwank was a device which emitted skelkwank light. The prefix fta- is roughly equivalent to the English suffix "-er".