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Old 04-22-2017, 10:25 PM #1
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Default Sanwu challenger 800mw strange beam

I have a sanwu 800 mw challenger - have had it for a few weeks. Looked great at first but the beam recently weakened (at all mode settings) and there are two strange artifacts. First, the "dot" is no longer a dot. It is like a dot surrounded by two crescents - there are three separate "lobes" of light. Additionally, there is a large dimmer circular halo surrounding the dot that wasn't there before. This effect is not due to the lens as I have tried both a G2 and G7 lens and the effect is still there. Overall, it is about half as bright as my 300mw 405nm challenger.

Any ideas what is going on?


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Old 04-22-2017, 10:34 PM #2
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Default Re: Sanwu challenger 800mw strange beam

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Originally Posted by Fungusamongus View Post
I have a sanwu 800 mw challenger - have had it for a few weeks. Looked great at first but the beam recently weakened (at all mode settings) and there are two strange artifacts. First, the "dot" is no longer a dot. It is like a dot surrounded by two crescents - there are three separate "lobes" of light. Additionally, there is a large dimmer circular halo surrounding the dot that wasn't there before. This effect is not due to the lens as I have tried both a G2 and G7 lens and the effect is still there. Overall, it is about half as bright as my 300mw 405nm challenger.

Any ideas what is going on?
Ask Podo or email Sanwu directly.
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Old 04-22-2017, 10:36 PM #3
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Default Re: Sanwu challenger 800mw strange beam

Who is podo? Sorry - I am new here.
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Old 04-22-2017, 10:41 PM #4
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Default Re: Sanwu challenger 800mw strange beam

Can you post pictures? Also saying what wavelength the 800mw challenger is would be helpful.
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Old 04-22-2017, 10:42 PM #5
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Default Re: Sanwu challenger 800mw strange beam

Any chance you put the lens in backwards?
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Old 04-22-2017, 10:43 PM #6
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Default Re: Sanwu challenger 800mw strange beam

Podo is the Sanwu guy on the forum. He would end up dealing with the issue though private messages on the forum. Might as well just email Sanwu. Just reply to the email with the tracking you received.
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Old 04-22-2017, 10:44 PM #7
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Default Re: Sanwu challenger 800mw strange beam

Ok - it is 405nm. Hang on - I'll upload a photo. I am sure sanwu will figure it out but I am curious - I am not super knowledgeable but I read somewhere about diodes sometimes "switching modes" or something like that.
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Old 04-22-2017, 10:45 PM #8
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Default Re: Sanwu challenger 800mw strange beam

Quote:
Originally Posted by Fungusamongus View Post
Who is podo? Sorry - I am new here.
Podo is a member here from Sanwu, not sure if owner or just employee.

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You may have a weird beam mode, does it look like any of these?



Sounds like you're laser might be running TEM02 or similar, but I hardly know much about beam modes at all only what they are.
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Old 04-22-2017, 10:48 PM #9
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Default Re: Sanwu challenger 800mw strange beam

I am trying to post a picture of the laser dot here - hope this works.
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Sanwu challenger 800mw strange beam-img_7237.jpg  
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Old 04-22-2017, 10:50 PM #10
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Default Re: Sanwu challenger 800mw strange beam

Looks like the image labeled "tem 20" or "tem 2". Is this likely to be a permanent thing or do these diodes switch back and forth?

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Old 04-22-2017, 10:56 PM #11
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Default Re: Sanwu challenger 800mw strange beam

Diode window came loose? Try tapping it GENTLY to see if the pattern changes.
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Old 04-22-2017, 11:03 PM #12
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Default Re: Sanwu challenger 800mw strange beam

By that picture the lens isn't in wrong.

Not what your going to want to hear but I've led'ed diodes before and that's what it looked like. Sorry.
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Old 04-22-2017, 11:04 PM #13
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Default Re: Sanwu challenger 800mw strange beam

Tap the diode itself?
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Old 04-22-2017, 11:05 PM #14
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Default Re: Sanwu challenger 800mw strange beam

What do you mean by "led'd a diode"? It is still emitting collimated light - the shape has changed and the power dropped quite a bit.
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Old 04-22-2017, 11:19 PM #15
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Default Re: Sanwu challenger 800mw strange beam

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Originally Posted by Fungusamongus View Post
What do you mean by "led'd a diode"? It is still emitting collimated light - the shape has changed and the power dropped quite a bit.
Hopefully someone can explain it better than me. It's when a diode burns out it drops 80% of its power still works a little, mine produced a spot very simular to that. Hopefully I'm wrong but if not hopefully Podo can help. Still hoping I'm wrong but~~~~~~

Edit, man, there was a lot of hopefully's there.
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Old 04-23-2017, 10:13 PM #16
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Default Re: Sanwu challenger 800mw strange beam

Don't think I've ever seen nor heard of single mode diodes mode hopping. That is mostly a gas and DPSS thing. Unfortunately that does look led'd. It is when the die takes damage (these are being pushed hard) and the output loses coherence. When this happens, the output drops drastically and it will no longer focus properly. If it were the diode window, rolling the laser while on should cause a change in output as it rolls. These 405's are very well known to die for seemingly no reason at all. If anyone has ever had a diode mode hop, please say so.
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