Which quantity describes the mean intensity across the beam's cross-section?

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Multiple Choice

Which quantity describes the mean intensity across the beam's cross-section?

Explanation:
Spatial averaging of a beam’s intensity across its cross-section is described by the spatial average intensity. This is the mean value of I(x,y) over the beam’s cross-sectional area A, defined as Isa = (1/A) ∫∫_A I(x,y) dA. It captures the overall, area-wide brightness, not just the brightest point. It differs from the spatial peak intensity, which is the maximum value of I(x,y) somewhere in the cross-section, and from temporal or pulse-average quantities, which average over time rather than over space.

Spatial averaging of a beam’s intensity across its cross-section is described by the spatial average intensity. This is the mean value of I(x,y) over the beam’s cross-sectional area A, defined as Isa = (1/A) ∫∫_A I(x,y) dA. It captures the overall, area-wide brightness, not just the brightest point. It differs from the spatial peak intensity, which is the maximum value of I(x,y) somewhere in the cross-section, and from temporal or pulse-average quantities, which average over time rather than over space.

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