GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
A Gaussian beam emitted by a Helium-Neon laser hitting a screen. This laser emits a fundamental mode which has a Gaussian intensity distribution across the beam. The characteristic laser speckle pattern is apparent. The speckle results from scattering of the monochromatic beam by a screen that is rough on a microscopic (wavelength) scale.
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