Output Beam Diameter, DO (mm) --
$$ D_O = D_I + 2 \left[ L \cdot \tan{\left( \frac{\theta _I}{2} \right)} \right] $$
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Determine spot size of our lasers and laser diode modules from user supplied working distances. Calculator provides circular or elliptical spot size approximations based on 1/e2 beam diameter and beam divergence; for lasers, beam diameter is given for TEM00 mode. Spot size visibility varies based on ambient light conditions.
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