Abstract
A method involving modulation transfer functions has been used to study the temporal and spatial resolutions of Photochron streak tubes. This is shown to be a much more physically realistic and reliable approach for the evaluation of the temporal resolution of a streak camera than that based on the commonly applied Gaussian approximations. The results obtained from the temporal modulation transfer functions (TMTF) indicate that the increase of the electric field near the photocathode is an insufficient condition to ensure the best temporal resolution. It is also shown that there is an optimum streak speed for which the camera instrumental function is a minimum, and theoretical estimates are given for the Photochron I, II, and IV streak image tubes.
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