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Thread: How to calculate the divergence

  1. #1
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    Default How to calculate the divergence

    Hello guys

    I,m testing some lenses and i wondered if anyone could help me with how to calculate the divergence.

    If anyone can help me that would be great!

  2. #2
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    Quote Originally Posted by edison View Post
    Hello guys

    I,m testing some lenses and i wondered if anyone could help me with how to calculate the divergence.

    If anyone can help me that would be great!

    i use this http://www.pseudonomen.com/lasers/ca...alculator.html

  3. #3
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    Thanks badger thats just what i need!!!

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    Quote Originally Posted by edison View Post
    Thanks badger thats just what i need!!!
    thats ok
    its my best tool in the tool box, found it when i first got into lasers

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    Default Diagram I made a while back...

    For the mathematically inclined...

    - There is no such word as "can't" -
    - 60% of the time it works every time -

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    Thanks i,m developing my own modules and i need to calculate the divergence for my setups.

  7. #7
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    Just remember, you sell yourself short if the beam is anywhere near Guassian , if you do not use the 18 and 82% power points instead of the edges.

    Steve
    Qui habet Christos, habet Vitam!
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    When I still could have...

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    Thanks for that diagram Daniel, I was curious as to how to visualize the formula. (b-a)/L kinda looks like an integral problem from beginning calculus. One part I didn't understand was the angle and why in the diagram its taken from only one edge of the beginning of the beam, and not the center?

    -Allen

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    Quote Originally Posted by prodjallenbackup View Post
    kinda looks like an integral problem from beginning calculus.
    No; basic trigonometry.

    Quote Originally Posted by prodjallenbackup View Post
    One part I didn't understand was the angle and why in the diagram its taken from only one edge of the beginning of the beam, and not the center?
    Accuracy. Obviously exaggerated on the diagram for clarity.
    Theta is half angle divergence.
    Alpha is full angle divergence.
    - There is no such word as "can't" -
    - 60% of the time it works every time -

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