The L-s1 laser cannon, a type of laser cannon, was produced by Sienar Fleet Systems. A pair of L-s1 laser cannons were standard armament for each TIE/ln space superiority starfighter. Numerous Imperial fighter craft utilized this weapon. Examples include the TIE/ln space superiority, TIE/sa bomber, TIE/sk x1 experimental air superiority fighter, TIE/d "Defender" Multi-Role Starfighter, TIE/IN interceptor, and TIE Advanced x1.
Due to its tendency to overheat and reduce a fighter's speed during firing because of power being diverted from the craft's twin ion engines, the L-s1 was superseded by the L-s7.2 laser cannon within the TIE fighter series following the Battle of Endor.