A LASIK vision correction system uses a laser that emits10 ns long pulses of lig

Question

A LASIK vision correction system uses a laser that emits10 ns long pulses of light, each with 2.5 mJ of energy. Thelaser is focused to a 0.90 mm-diameter circle.

What is the electric field strength of the laser light at thefocus point?

This is what I did:

the average power of each laser pulse is P = 2.5 mJ/10 ns =2.5*105 W

The area of the circle is A = *(0.45 mm)2 =6.36*10-7 m2

So the magnitude of the Poynting vector S = P/A =3.93*1011 W/m2

Use S = 0cE2,

E = [S/(0c)] = 1.22*107V/m

Is there anything wrong?

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