Gaussian Radius of curvature in an argon ion laser

lauraboyleify

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

Related Atomic and Condensed Matter News on Phys.org

DeShark

Beam width isn't beam radius!

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving