Laser diffraction through single slit

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Danyon
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Will a laser diffract through a single slit if the laser beam width is smaller than the slit? Such that the laser beam can pass though without touching the sides.
 
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Example: shine a laser beam (e.g. from a laser pointer) through the center of an open doorway.
 
The laser exit itself is like a single slit already, and you see its effect: you don't see its diffraction (for most lasers).