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fix laser focusing equation#5

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ShaunD137 wants to merge 3 commits intoepochpic:mainfrom
ShaunD137:laser_focusing_fix
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fix laser focusing equation#5
ShaunD137 wants to merge 3 commits intoepochpic:mainfrom
ShaunD137:laser_focusing_fix

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@ShaunD137
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@ShaunD137 ShaunD137 commented Feb 25, 2026

The laser focusing example in the quickstart guide had errors in the equations.

  • I_boundary = I_peak_Wcm2 * (w0 / w_boundary)^2is only applicable in the 2D case this has been changed to I_boundary = I_peak_Wcm2 * (w0 / w_boundary)^1, with an extra comment saying to change it back for 3D.
  • gouy = atan(-foc_dist/rad_curve) was incorrect, this has been changed to gouy = atan(-foc_dist/ray_rang).

@ShaunD137
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@TomGoffrey this might be useful for the EPOCH workshop.

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