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Gaussian Radius of curvature in an argon ion laser

  1. Dec 5, 2012 #1
    Hi, having a bit of trouble with this question
    "In an argon ion laser ( λ = 514nm) the minimum beam waist is 1.0mm and is close to the plane mirror. Calculate the radius of curvature of the beam at the output mirror. 1.15m away"

    Attempt at a solution:

    θ = 2λ/pi W02
    R = Z + ZR2/Z
    ZR = piW02 / λ
    I used
    W0 = min beam waist = 1.00 mm
    Z= distance from beam waist to mirror = 1.15m
    And found Zr with the formula and used it in the Radius of curvature, R formula but got the worng answer. I got R = 33.5m
    The answer given is R = 3.08m
  2. jcsd
  3. Dec 6, 2012 #2
    Beam width isn't beam radius!
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