A 200MW laser pulse is focused with a lens to a diameter of 1.0 ? m . Part A Wha

Question

A 200MW laser pulse is focused with a lens to a diameter of 1.0?m .

Part A

What is the laser beam's electric field amplitude at the focal point?

Express your answer using two significant figures.

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Part B

What is the ration of the laser beam's electric field to the electric field that keeps the electron bound to the proton of a hydrogen atom? The radius of the eletron's orbit is 0.053 nm.

Express your answer using two significant figures.

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Explanation / Answer

if

A 200 MW laser pulse is focused with a lens to a diameter of 2.0 micrometers.

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a)

I used I = P/A to find the intensity using the power and area and then used E = sqrt( (2* I) / (c * epsilon_0)) to find the amplitude of the electric field and I got a numerical value of 2.19

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