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Spot size

The spot size of a beam is the beam diameter in free space. It varies along the length of the beam according to the equation:

πœ”π‘§.= πœ”0.,-1+,,,𝑧-,𝑧-π‘Ÿ...-2..

Where

,𝑧-π‘Ÿ.=,πœ‹,πœ”-0-2.-,π‘Ÿ-2..

And ω0 is the beam diameter at r=0, which is the minimum beam experienced by the beam.

 

 

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