Ion laser cathode

This article introduced high reliable and long life heater cathode for ceramic tungsten disks ion laser. The structural cathode has uniform operating temperature, long life and characteristic of ion bombardment resistance. It can provide larger emission current than applied required current. From the eighties till now, developing ion laser by us mainly uses general heater stored cathode of tungsten sponges. Beryllium oxide tube ion laser uses paraxonic tungsten sponge cathode. The cathode operates at 3v voltage and 14-18A current. Laser power is up to practical requirement and more than 25mw, 50mw and l00mw respectively. Ceramic tungsten disks ion laser uses coaxial tungsten sponge cathode and operates at 4v voltage and 23 /spl sim/ 28A current. Laser power is up to practical requirement: l.0w, 3.0w, 5w, l0w, 15w respectively. At the later of nineties, helical incense - coil type heater stored cathode of tungsten sponge was developed. It operates at 2.8V voltage and 35 /spl sim/ 40A current. The power is up to practical requirement and more than 20w. Because improved cathode structure, the operating temperature of the cathode is more uniform. Accurate machining to cathode size and smooth and active material have different change and selection. This not only reduces ion bombardment, sputter and other possible pernicious effects, but also increases used life, operating stability and thermoelectron emission current. The cathode includes the emitting material with low work function, which consists of barium oxide, calcium oxide and aluminium hydroxide according to optimum proportion and is calcined. The cathode is widely used for argon and krypton ion laser as its particular structure, large emission current, stability and reliability.