Lasers and max electric and magnetic fields?
I need help with this problem. I can’t figure out how to solve parts b,c, and d. I got part A. I don’t necessarily want the answers, just need help in how i should go about solving it. Any help would be much appreciated.
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He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633 nm and a power of 0.450 mW spread over a cylindrical beam 1.05 mm in diameter (although these quantities can vary).
a.What is the intensity of this laser beam?
b.What is the maximum value of the electric field?
c.What is the maximum value of the magnetic field?
d.What is the average energy density in the laser beam?
B. Since you know I(ave), you save a step.
I(peak) = 2I(ave)
E = sqrt(I(peak)*Z0)
C. H = sqrt(I(peak)/Z0) and B = µ0*H
D. Ave. energy density = I(ave)/c J/m^3, where c = velocity of light.
Note: Free-space impedance Z0 = sqrt(µ0/e0) = 376.7303 Ω; μ0 = 4π*1E-7 = 1.256637E-6 N/A^2; e0 = 8.854188E-12 F/M
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