How to calculate the divergence

[edison]

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!

[badger1666]

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

[edison]

Thanks badger thats just what i need!!!

[badger1666]

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

[danielbriggs]

For the mathematically inclined...

[edison]

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

[mixedgas]

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

[prodjallenbackup]

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

[danielbriggs]

kinda looks like an integral problem from beginning calculus.

No; basic trigonometry.

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.