CW HE-KR-FREQUENCY EXCITATION( LASER WITH TRANSVERSE RADIO)

A cw He-Kr+ laser was excited with a capacitively coupled transverse r adio frequency discharge. The laser was operated in a simple 40-cm act ive length alumina oxide tube which ends off via ceramic glass transit ions in Brewster windows. Transformation of the laser discharge tube i mpedance to the 50 Omega output resistance of the rf source and symmet rization of the rf voltage were performed by a special matching networ k. cw lasing was obtained at 469.4, 458.3, 438.7, and 431.8 nm. The ou tput power of all lines amounts to 35 mW at an input power of 600 W. T he rms noise of the laser intensity did not exceed 0.6%.