High-Speed Imaging of Laser Intensity Distribution Using an Acousto-Optic Deflector

Abstract

An acousto-optic laser deflector was used to image the intensity distribution of a continuous wave laser in the order of μs. Undeflected light was blocked while the deflected light was directed to a CCD camera, which allowed imaging of the incident laser intensity distribution in the order of μs. Experiments using a test pattern showed that there was no distortion in the deflected image. The resolution limit, estimated from diffractive effects, was about 0.2 mrad. Using this method of high-speed imaging, density variations accompanying laser-induced breakdown in air were visualized by shadowgraphy and interferometry.