I have a gaussian beam going through two lenses. The first lens is focusing a collimated gaussian beam to a focal point either before or after the second lens.

What formula do I use to get the focal length (the strength of the lens) of the second lens such that the beam, after going through both lenses, focuses at a point "x" after the second lens?

  • $\begingroup$ I'm setting up an experiment but have little knowledge in optics $\endgroup$ – Goldname Jul 1 '18 at 17:33
  • $\begingroup$ physics.stackexchange.com/questions/247617/… ? $\endgroup$ – HiddenBabel Jul 1 '18 at 18:15
  • $\begingroup$ For the formula, does the total focal length calculated factor in the distance between the two lens? $\endgroup$ – Goldname Jul 1 '18 at 19:13

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