Question: A (200 mathrm{MW}) laser pulse is focused with a lens to a diameter of(2.0 mu mathrm{m}). What is the laser beam's electric field amplitude at

A $200 \mathrm{MW}$ laser pulse is focused with a lens to a diameter of$2.0 \mu \mathrm{m}$. What is the laser beam's electric field amplitude at the focal point?

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