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FrozenGate by Avery

Help to focus 445nm M140






I reversed the lens... now I got a pretty straight line with a brighter dot before the end... Pleaseee help!
 
keyblade95 said:
I reversed the lens... now I got a pretty straight line with a brighter dot before the end... Pleaseee help!
Click to expand...


Some pictures would help if you could post some. Not sure about the M140 but a lot of the higher powered diodes DO have a rectangular/line shaped beam.
 
I found out that g-2 lens was set at the wrong orientation! Thanks to this: G2 Lens Correct Focus Ring Orientation
w1zhuc.jpg
 
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Take the silver thumb adjuster off and see if the lens will screw in further, the thumb adjuster may be stopping it from getting close enough to the diode.
 
If I screw the lens in further, going on very near to the diode, I get a bigger and bigger circle.. I think the result above is the best I can reach
 
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yes G-2 give horible beam shape and not to mention it's a multimode diode.. if you got a line then that the best things will get..
 
It does depend. He put a link to Darkly Digital for the G-2 orientation so I am guessing there is a chance he is using it for engraving. If so then the G-2 will make a smaller spot than the three element lens since it is a short focal length lens and exits the aperture smaller but does diverge more over distance. The three element lens is a longer focal length so it exits with a larger beam but diverges a little less over distance. In the 30mm from the aperture to the work which is the most common distance I see the CNC guys recommending for use of these diodes in engraving the G-2 will make a smaller spot.

If this is not for engraving and you are looking at longer distances yes the three element lens will make a more pleasing spot. This thread give a pretty good comparison.
http://laserpointerforums.com/f65/there-something-wrong-my-beam-spot-59400.html
 
Sure seems like that is actually a 405nm and not a 445nm watching the video. Looks like a low powered module which makes the odds of it being a 445nm low unless it is a single mode which I highly doubt. Sure that lens isn't scratched up or has junk on it? What is the laser used for?
 
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My purpose is not to engraving. It's the M140 diode is 445nm for sure! And I have temporary underfed the diode (100mA) in this testing phase
 
You'll have to just rotate the lens gradually so that the beam gets smaller. You'll eventually get it to a point where the beam is tightest, but with those G2 lenses you'll probably still see a lot of splash outside the main "dot." The dot itself will look somewhat rectangular. It's just how they look.
 
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could be the lens is lose or the lens is no good !! :)
Or the diode is no good !
 
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Hi,
Sure the lens is in backwards , lens closest the end of the barrel goes towards the diode.

Rich:)
 
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