how do you make a one photon-thick beam of light. ?
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A light beam or beam of light is a directional projection of light energy radiating from a light source. Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. Light from certain types of laser has the smallest possible beam divergence.
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The way to get the narrowest beam of light possible is by using the smallest wavelength available to you and focusing the beam, and not by lining up photons (which doesn't really make sense in the first place). There is no such thing as a one-photon-thick beam of light.
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