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if you're using 2007 or later version zemax, it's easy to get laser beam M-sqare: W g3WE1V
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1) Editors --> Merit Function: to edit the merit function Type=POPD, Data=25 OR 26 for beam M^2; set Surf, Wave,Field per your system configuration; S4AB tKG
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2) Tools --> Optimization --> Merit Function Listing: to open a text window display merit function; 6!Ap;O^*
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3) Analysis --> Physical Optics -->POP: to set incident beam parameters like waist...., remember to Save your setting before POP analysis; '$&(+>)z `
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4) You'll see M^2 on the Merit Function Listing window. ?f%DVK d
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In old version Zemax (before ver2007), M^2 is complicated to get, designer has to calculate manually. g\mrRZ/?
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Attached is a example, hope it be helpful. M}RFFg
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Let me know how thing's going. Vu8-Cy>Q?
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