1) Optical component
Found on
https://www.crosswordclues.com/clue/spatial-filter
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 la.....
Found on
http://en.wikipedia.org/wiki/Spatial_filter
<radiobiology> Device consisting of a lens pair and a pinhole aperture stop. Intensity fluctuations over the spatial extent of a laser beam are removed by passing the focused beam through the aperture stop. The pinhole must be placed in a vacuum to prevent air breakdown by the focused beam. These filters are used to counter the effects caused...
Found on
http://www.encyclo.co.uk/local/20973
No exact match found.
