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Old 08-02-2013, 09:22 PM #1
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Default Bad Luck Laser

It seems my semi-ghetto peltier-cooled handheld lab device has been nothing but bad luck.

Bad luck lens (getting refunded because of optical aberrations)


Bad luck switch


Bad luck batteries (they discharge in 30 seconds and get quite warm, because I overloaded them 2.3 times over: 3.1A where max is 1.35A.)


Bad luck driver


And finally... Bad luck diode


When I was graphing it, and hit 1700mA, the dot suddenly started to dim, I immediately disconnected it which was within a fraction of a second. Then I tapped the contact intermittently, and nonetheless the amount of lasing kept getting less, and after 2 seconds or so of on-time it hit what looks like COD.

The laser was getting quite hot, because I worked the peltier sub-optimally to prevent it from freezing in between measurements, but it wasn't too hot to hold. (It has been hotter in the past.) My guess is that at 1.7A it just reached the end of it's life (which was within 5 minutes in total).

At least the laser diode left a legacy:

Extra keywords: M140 M-140 power graph chart


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445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
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630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
660nm 208mW adjustable lab
808nm ~450mW floodlight, 7-laser, no optics
808nm 140mW IR module
...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)

Last edited by Zom-B; 08-03-2013 at 10:11 AM.
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Old 08-02-2013, 10:31 PM #2
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Default Re: Bad Luck Laser

Something isn't right.
I read "peltier cooled handheld",
Then I see 14500 batteries
Then I read 1.7A current.
60W thermoelectric coolers can (and will) draw >2A from a single li-ion. 5A If 3 li-ions, series.

I don't think it is bad luck, maybe bad planning?
I don't see any links to a build thread or anything
and what the caps on everything, related to??

Not mean't to bash or anything.
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Old 08-02-2013, 10:51 PM #3
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Default Re: Bad Luck Laser

Sorry for your loss but at least its some experience, you will do better next time. Yes certainly too small of batteries you needed something much larger. Did you really test that with an acrylic lens up to almost 1200mw? I would think it would be smoking about then. Good luck with your next build.
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Old 08-02-2013, 11:39 PM #4
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Default Re: Bad Luck Laser

@Leodahsan the link is right in the first sentence. links don't automatically underscore for some reason. The peltier has it's own linear driver. And it's nowhere near 60W.

@PiR that's why I was changing batteries to something beefier. I have experience enough. I graphed dozens of PHR-803Ts and some reds, and of course sometimes they die, but this wasn't over-driving compared to before.

I was surprised how well the acrylic held out. After I put it in, I unfocussed it so I could inspect the beam pattern and see any signs of melting or deforming, then powered it at full power for about a minute (no driver, because it broked, but power supply at 1.7A limited), and it stayed sharp. After all the graphing, I got the lens out and there are no signs of melting. All the knife cuts from widening the aperture are still crisp. I'm as surprised as you, but my LPM doesn't lie.
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405nm 166mW adjustable lab
405nm 130mW Xtreem
445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
532nm 40mW New Wish pointer
630nm 5.00mW stable pointer
630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
660nm 208mW adjustable lab
808nm ~450mW floodlight, 7-laser, no optics
808nm 140mW IR module
...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)

Last edited by Zom-B; 08-03-2013 at 12:44 AM.
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Old 08-03-2013, 12:47 AM #5
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Default Re: Bad Luck Laser

You didn't inserted the link. Its hyperlinking a phrase.

About Peltier
I just wrote that for a quick reference that solid state heat pumps draw a lot of energy. You can even calculate how much is needed for removing the ~7 watts of heat from the diode. I'm just trying to point out why the 14500 batteries died.

Last edited by Leodahsan; 08-03-2013 at 12:59 AM.
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Old 08-03-2013, 10:12 AM #6
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Default Re: Bad Luck Laser

Well, oops. hehe. Bad Luck Link? The link was always in my sig too though.
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405nm 166mW adjustable lab
405nm 130mW Xtreem
445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
532nm 40mW New Wish pointer
630nm 5.00mW stable pointer
630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
660nm 208mW adjustable lab
808nm ~450mW floodlight, 7-laser, no optics
808nm 140mW IR module
...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)

Last edited by Zom-B; 08-04-2013 at 12:45 AM.
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Old 08-03-2013, 11:54 PM #7
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Default Re: Bad Luck Laser

once in a while you just have a build where everything goes wrong and everything brakes. It can be very frustrating

greetings,,
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Old 08-04-2013, 02:46 AM #8
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Default Re: Bad Luck Laser

Well I can point out two issues I see just with the module. I think the reason it ran for only a few seconds and dimmed is it overheated. There is virtually no heatsinksing with this mounting you have going there. Also I would get some shrink tubing on those diode pins.

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Old 08-04-2013, 12:40 PM #9
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Default Re: Bad Luck Laser

See that white piece at the bottom? That's the ceramic top of the peltier.

It's true that I had concerns about the temperature, because of the temperature gradient in the aixiz head. When I measured it, it was 25C at the bottom and 50C degrees on top (where you see the thin spot of thermal grease)
__________________
405nm 166mW adjustable lab
405nm 130mW Xtreem
445nm 0.005W@1.7A semi-ghetto peltier-cooled labby-style handheld on batteries (BLL)
532nm 40mW New Wish pointer
630nm 5.00mW stable pointer
630nm <5mW mini (batteris+switch inside Aixiz)
660nm 265mW@0.5A Leadlight
660nm 208mW adjustable lab
808nm ~450mW floodlight, 7-laser, no optics
808nm 140mW IR module
...
Omitted are minor lasers, unworthy lasers, and bare diodes.

Forever wanted: ~505nm laser (and not just one of many lines!)

Last edited by Zom-B; 08-04-2013 at 12:41 PM.
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