Question: Gaussian beam formulae for Q2. Beam waist: W = (20) /2, Beam radius: W(z) = W [1 + (-)]. 2zo1/2 Wo [1 + (9)],

Gaussian beam formulae for Q2. Beam waist: W = (20) /2, Beam radius: W(z) = W [1 + (-)]. 2zo1/2 Wo [1 + (9)], Phase retardation: 3 = arctan (2) Radius of curvature: R(z) = z 1+ Optical fluence (in J.m2) F(p) = 2ET 24/7 exp[-2 (+)]. Q 2(c) Show that at large z, 00 ~ 2 Wo [5 Marks] and estimate the value half-beam divergence angle o for Wo = 20 mm (with = 10.6 m). Also, calculate the beam radius at z = 2zo, z = 4zo and z = 8zo.

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