hw3 - ECE 414 Homework 3 1. Due Feb. 22, 2011 2. 3. 4. 5. 2...

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Unformatted text preview: ECE 414 Homework 3 1. Due Feb. 22, 2011 2. 3. 4. 5. 2 By defining the beam radius as: w 2 (z) = w0 [1 + ( !z 2 ) ] , the radius of curvature as 2 " w0 R(z) = z[1 + ( 2 2 ! w0 2 ! w0 ) ] , and location of minimum beam radius at position zR = "z " , Derive the expression for q(z): 1 1 ! 1 = !j = 2 q(z) R(z) " w (z) z + jzR ...
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