出典:Wikipedia
出典:『Wikipedia』 (2010/09/28 18:07 UTC 版)
A spatial filter is an optical device which uses the principles of Fourier optics to alter the structure of a beam of coherent light or other electromagnetic radiation. Spatial filtering is commonly used to "clean up" the output of lasers, removing aberrations in the beam due to imperfect, dirty, or damaged optics, or due to variations in the laser gain medium itself. This can be used to produce a laser beam containing only a single transverse mode of the laser's optical resonator.
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a filter used for taking a photograph
3次元.
the visual perception of space
a color filter [screen]
a membrane which is semipermeable
a filter that is used for colouring a photograph
the drastically cut film