PICOSECOND PHOTOGRAPHY AND TIME-RESOLVED SPECTROGRAPHY
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Some recent advances at Bell Laboratories are discussed. Rentzepis produced a moving open aperture in a Kerr cell in front of a spectrograph slit. This is the analog of earlier work that moved an image of an aperture along a spectrograph slit with a rotating mirror, but allows recording with a resolution of about a picosecond and a total duration 10 or 20 times this. Rentzepis and his colleagues have developed a technique to produce a train of pulses from a single picosecond pulse using an echelon. They can use this train of pulses to probe the open time of a shutter; and they have used it to show that the time to open the CS//2 Kerr cell is 1. 8 picoseconds.