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Thickness from TVL₁ and TVLₑ

n = 3.000

n=−log⁡10B,x=TVL1+(n−1) TVLe (n>1)n=-\log_{10} B,\quad x=\mathrm{TVL}_1+(n-1)\,\mathrm{TVL}_e\ (n>1)

First tenth-value layer differs from equilibrium TVL for broad beams.

Laser