Let's apply the energy density and intensity equations to a
laser. In particular, we will consider an industrial laser cutter
that is used for cutting through thin sheets of soft materials. It
emits a beam with electric-field amplitude Emax=2.76×105V/m over an
area of 2.00 mm2. Find (a) the maximum magnetic field Bmax, (b) the
maximum energy density umax, (c) the intensity Sav=I of the beam,
and (d) the average power of the beam.
Find the maximum energy density for a 3000 W laser with an
electric-field amplitude Emax=9.44×105N/C.