Document No 50398-001 Rev F 02 Aug 2020
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Power density also plays a role in the operating space. The chart below shows the required power vs. focus spot size for a
top hat beam.
The equation to estimate the maximum spot size is derived from the power density equation:
𝑃𝑜𝑤𝑒𝑟 𝐷𝑒𝑛𝑠𝑖𝑡𝑦 =
𝑃
𝑎𝑣𝑒
𝐴
𝐷4𝜎
≥ 2 × 10
6
𝑊
𝑐𝑚
2
Where P
ave
is the average beam power and A
D4
σ
is the area of the beam at the
D4σ
location.
