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Given a 1 W TEM₀₀ laser beam with λ₀ = 514.5 nm from an argon ion laser with a minimum spot size w₀ = 2 mm located at z = 0: (a) How far does this beam propagate until w(z) = 1 cm? (b) At z = 1 cm, what is the radius of curvature of the phase front? (c) What is the electric field amplitude at r = z = 0?
Sagot :
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