S1 photocathode designed for streak camera image converter tubes

Semitransparent S1 photocathodes have been developed on a low‐resistivity SnO2 layer for streak camera image converter tubes. The 50‐Ω/⧠ resistivity combined with good photocathode sensitivity prevents parasitic effects and provides an efficient diagnosis tool for 1.06‐μm laser–plasma interaction experiments. Furthermore, the lifetime in the 1‐μm range has been greatly increased by a rebaking process which may reestablish the 1.06‐μm sensitivity.