A typical classical opto-mechanical design --- Compact Laser Rangefinder which I worked with at the very beginning of 1990's --- Modeled in Zemax and SW. ,EB}IG]
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Optomechanical FEA analysis will be the next coming topic( 2 or 3 high precise systems completed using SW+Cosmos/Ansys+CodeV+Matlabwill be presented ).