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I am not a specialist in optics so I needed a big help, I'm doing this experiment where I am using a blue laser diode PLTB450B which is collimated using a G2 lens, now my question is how to find the spot size of the beam experimentally? As I need to produce a small spot and then use a flurosence in that position to produce a white light

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One way is to use the knife-edge method. The idea is to measure the total power in the beam after part of it is clipped by a knife edge. By doing so one can relate the power measurement with the position of the knife edge in the beam. For a Gaussian beam the curve would be an error-function and its scale would give the width of the Gaussian.

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  • $\begingroup$ One would also likely want to do this along two orthogonal directions to check if it is symmetric or not. $\endgroup$
    – Jon Custer
    Commented Jan 7, 2018 at 17:41

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