I would like to know if the lens diameter, i.e the size of the lens, affect the focused spot size. Given a parallel beam of diameter d, is there a lower limit of lens diameter D, after which aberration effects, simple linear ray-tracing fails, and the spot is no longer the smallest size possible?
I am participating in a competition which requires focusing laser beam. Since the beam diameter of diode lasers are small, I wish to know if I could use lens of size 10s of orders of magnitude of the beam diameter to focus it to a small spot.
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