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The UCRL light-pulse generator provides flashes of light accompanied by electrical pulses generated at an impedance level of 50 ohms. The usual repetition rate is 60 cps. The 10 to 90% rise, both for the light and for the electrical pulse, is less than 0.5 m mu sec. The light pulse rises and then falls to 50% peak amplitude in less than 1.5 m mu sec. The time relation between the light and electrical pulses is fixed. The electrical pulse power available is large. In conjunction with an oscilloscope, the light-pulse generator has proved useful in the testing and evaluation of multiplier phototubes and lowlight- level image devices. Time resolution of 10/sup -10/ second is typical of measurements made with conventional fast oscilloscopes (e.g., Tektronix 517), while elaboration of technique permits relative time measurements that are better in some cases by at least three orders of magnitude. The light is emitted from a region a few mils in diameter, and thus may often be considered to come from a poirt source. An S4 photosurface subtending 0.1 steradian at the light source emits photoelectrically about 10/sup7/ electrons per steradian per pulse. For convenience, three decoupled electrical out-put channels are provided, together with a polaroid attenuator for the light pulse. (auth)

A GENERATOR OF FAST-RISING LIGHT PULSES FOR PHOTOTUBE TESTING