Intensity of laser if it is projected onto a circular spot 1.00mm in diameter is 445w/m^2, the peak magnetic field strength is 1.9x10-6T and the peak electric field strength is 560V/m.
Given the helium-neon lasers have power outputs of (P) = 0.35mW
diameter (d) = 1mm
Then radius (r) = 0.5x10-3m
We know that intensity (I) = power/area = P/πr^2
(a) I = 0.35x10-3/π(0.5x10-3)^2 = 445w/m^2
(b) We know average intensity (I0) = cB0^2/2µ0 where B0 is the magnetic field, c is the speed of light then B0 = √2µ0I0/C
B0 = √2x4πx10-7x445/3x10^8 = √372.6x10-14 = 1.9x10-6T
(c) We know that E/B = c where E is the electric field
E = Bxc = 1.9x10-6x3x10^8 = 560V/m
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