Abstract
An acousto-optic laser deflector was used to obtain shadowgraphs and laser interference fringe patterns at microsecond-order exposure times by blocking the undeflected light and exposing the imaging device to the deflected light. This method allows μ-order imaging using an ordinary CCD camera, and is less susceptible to damage resulting from incidence of high intensity light, which is a problem when using image intensifiers. Using this method, shadowgraphs and laser interference fringe patterns showing density changes accompanying spark discharges in air, pre-breakdown phenomena such as streamers and leaders, and laser-induced breakdown in air were obtained. In addition, by sequentially applying high frequency signals of different frequencies, the incident light was deflected to different regions of the CCD chip, which allowed time-resolved imaging of laser interference fringes.
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