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Old 10-07-2009, 02:02 PM #1
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Default Focusing dragon beam expander for minimum divergence

I have a Viper 125mw with a beam expander. My question is - how can I determine the correct setting for minimum divergence at infinity? There is nothing on the screw to show the correct setting. Is the only way to try it out or is there a more scientific technique?

Many thanks

David


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The best:
270 mw Milos custom built focusable with exceptionally low divergence and pinpoint spot
125 mw Dragon pen style "viper" putting out 150+
PGL-III-473-C 50 mw - peaking at 100mw
Daguin 445 custom built putting out 570mw
Daguin custom built Kryton 8x outputting 370mw - burns like fury - superb build and beam
Lots of other lasers too
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Old 10-07-2009, 09:08 PM #2
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Default Re: Focusing dragon beam expander for minimum divergence

I would just set it at the best divergence over the longest distance you have available and put a dot of white paint on both sides of the expander to mark the best setting... so that when the dots are matched up, you know you have the minimum divergence.
It's easier to set divergence with someone at the other end of the beam to tell you when to stop.
Also, when adjusting, it isn't necessarily the best to set it at the smallest spot size at 'X' meters away, but at the point where the beam spot is the same size as the beam diameter at aperture 'X' meters away. This way, you don't get negative divergence (a converging focal point somewhere in the beam).

For example, with 1cm initial beam diameter from your expander, you want the beam to be close to 1cm at 1 meter away, 10 meters away, 50 meters away, etc.
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Old 10-08-2009, 12:14 AM #3
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Default Re: Focusing dragon beam expander for minimum divergence

Quote:
Originally Posted by davidgdg View Post
I have a Viper 125mw with a beam expander. My question is - how can I determine the correct setting for minimum divergence at infinity? There is nothing on the screw to show the correct setting. Is the only way to try it out or is there a more scientific technique?

Many thanks

David
There really isn't a more "scientific" way of doing it rather then trial and error, there are several ways to measure the divergence as you adjust it, however I think the only one which is feasible and affordable for people is to use a long distance and a measuring device.
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Old 10-09-2009, 08:56 AM #4
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Default Re: Focusing dragon beam expander for minimum divergence

Thanks all!
__________________
The best:
270 mw Milos custom built focusable with exceptionally low divergence and pinpoint spot
125 mw Dragon pen style "viper" putting out 150+
PGL-III-473-C 50 mw - peaking at 100mw
Daguin 445 custom built putting out 570mw
Daguin custom built Kryton 8x outputting 370mw - burns like fury - superb build and beam
Lots of other lasers too
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