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Laser beam divergence and spot size
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No Z1 (mm) Z2 (mm) w1 (mm) w2 (mm) Beam Divergence,θ(mrad)= (w2-w1)/(Z2-Z1) Spot size,w0 (mm)= wave length/(3.14*θ*1000) Confocal parameter,b(mm)=2*3.14*w02 / wave length

 

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