The pair of vertical deflection electrode plates 13 in the double sweeping streak camera are supplied with a voltage of a sawtooth wave in synchronization with the input optical beam pulses. The other pair of horizontal deflection electrode plates 14 are supplied with a voltage of a stepped wave in synchronization with the sawtooth wave. The deflection electrode plates 13 and 14 sweep successively incident photoelectrons. The photoelectrons are then detected at the phosphor screen 16. The phosphor screen 16 is therefore recorded with temporal changes in the spatial pattern of the optical beam pulse as an image of regularly-arranged optical beam patterns. The image analyzing device can easily analyze the image. <IMAGE>
Optical beam spatial pattern recording device