Broadband output coupler for photomultiplier system

Claim 1

A PHOTOMULTIPLIER DEVICE COMPRISING: A SOURCE OF PULSE MODULATED LIGHT ENERGY; A CATHODE OF PHOTOELECTRICALLY ACTIVE MATERIAL FOR EMITTING A PULSE MODULATED ELECTRON STREAM IN RESPONSE TO SAID PULSE MODULATED LIGHT ENERGY; AN OUTPUT COUPLER SPACED FROM SAID CATHODE; A SERIES OF DYNODES EACH WITH A SURFACE HAVING A HIGH RATIO OF SECONDARY EMISSION BEING ARRANGED BETWEEN SAID CATHODE AND SAID OUTPUT COUPLER; A BATTERY COMPRISING MEANS FOR BIASING SAID DYNODES AT PROGRESSIVELY HIGHER POSITIVE D.-C. POTENTIALS IN PROPORTION TO THEIR DISTANCE FROM SAID CATHODE; SAID DYNODES COMPRISING MEANS FOR EMITTING PULSE MODULATED ELECTRONS IN RESPONSE TO IMPINGEMENT OF ELECTRONS FROM SAID CATHODE OR FROM OTHER DYNODES; SAID OUTPUT COUPLER COMPRISING A COAXIAL CABLE HAVING A HOLLOW OUTER CONDUCTOR COAXIALLY SURROUNDING A HOLLOW INNER CONDUCTOR; A SLOT ON ONE SIDE OF EACH OF SAID CONDUCTORS, SAID SLOTS BEING IN ALIGNMENT; SAID DYNODES BEING POSITIONED TO DIRECT ELECTRONS THROUGH SAID SLOTS TO THE INTERIOR OF SAID HOLLOW INNER CONDUCTOR; THE COAXIAL CABLE ON ONE SIDE OF SAID SLOTS BEING TERMINATED BY A CHARACTERISTIC IMPEDANCE CONNECTION BETWEEN THE INNER AND OUTER CONDUCTORS; THE COAXIAL CABLE ON THE OTHER SIDE OF SAID SLOTS CONSTITUTING A TRANSMISSION LINE FOR PROPAGATING PULSE MODULATION ENERGY TO AN APPROPRIATE LOAD; AND MEANS CONNECTED TO SAID BATTERY FOR MAINTAINING SAID INNER AND OUTER CONDUCTORS AT SAME D.-C. VOLTAGE.