Lab 10: Spatial Profile of a Laser Beam
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چکیده
A laser beam can be characterized by measuring its spatial intensity profile at points perpendicular to its direction of propagation. The spatial intensity profile is the variation of intensity as a function of distance from the center of the beam, in a plane perpendicular to its direction of propagation. It is often convenient to think of a light wave as being an infinite plane electromagnetic wave. Such a wave propagating along (say) the z-axis will have its electric field uniformly distributed in the x-y plane. This implies that the spatial intensity profile of such a light source will be uniform as well. However, in reality, a light beam does not extend to infinity. Therefore, this picture of a light beam as an infinite plane wave is just an idealization.
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