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Lecture23 - z times a Gaussian in x and y 2 2 2 exp exp x y...

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Laser beams vs. Plane waves A plane wave has flat wave-fronts throughout all space. It also has infinite energy. It doesn’t exist in reality. A laser beam is more localized. We can approximate a laser beam as a plane wave vs.
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Unformatted text preview: z times a Gaussian in x and y : 2 2 2 ( , , , ) exp[ ( ) exp ] x y E x y z t E i kz t w ϖ = +- - % % Laser beam spot on wall w x y Localized wave-fronts z x exp(-x 2 )...
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