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Can the beam be focused down to a spot with diameter less than two times the wavelength or even less than a single wavelength?

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    $\begingroup$ Search for diffraction limited systems and Abbe limit. Google goes a long way nowadays. $\endgroup$ Jun 4, 2021 at 10:02
  • $\begingroup$ I see now, it wasn't immediately intuitive to me to relate focusing with diffraction. $\endgroup$ Jun 4, 2021 at 19:49

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