Short arc high-pressure discharge lamp

摘要

A short arc high-pressure discharge lamp ( 1 ) for dc operation, includes a discharge vessel ( 2 ) that has two necks ( 4 ) diametrically opposite each other, in which an anode ( 26 ) and a cathode ( 7 ) made of tungsten are melted in a gastight manner, and which has a filling made of at least one noble gas and possibly mercury. According to the invention, at least the material of the cathode tip ( 11 ) contains lanthanum oxide La₂O₃ and at least another oxide from the group consisting of hafnium oxide HfO₂ and zirconium oxide ZrO₂ in addition to the abovementioned tungsten.