Intense laser emission at 3577 A˚ (v′=0 of theC3&pgr;ustate tov″=1 of theB3&pgr;gstate of the nitrogen molecule) has been demonstrated to take place by an addition of a large quantity of SF6as a foreign gas in a transversely excited nitrogen laser. The output at 3577 A˚ is increased with increasing partial pressure of SF6, until a total pressure of up to 250 Torr. With sufficient SF6added, the output at 3371 A˚ is increased by a factor of 1.3 as compared with the case of N2gas alone.