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if you're using 2007 or later version zemax, it's easy to get laser beam M-sqare: kwud?2E
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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; ZO7&vF}
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2) Tools --> Optimization --> Merit Function Listing: to open a text window display merit function; X]y )ZF26
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3) Analysis --> Physical Optics -->POP: to set incident beam parameters like waist...., remember to Save your setting before POP analysis; gU R]{dq^'
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4) You'll see M^2 on the Merit Function Listing window. axk"^ gps
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In old version Zemax (before ver2007), M^2 is complicated to get, designer has to calculate manually. cM&2SRBZ
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Attached is a example, hope it be helpful. \@~UDP]7
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Let me know how thing's going. Vi]c%*k
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mang2004
