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50mW Green Pointer Only Outputs IR

M

MysticNinja

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Mar 19, 2010
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I've got a 532nM pointer from
HTML: 
http://www.amazon.com/gp/product/B000Y3N41U/ref=oss_product
. It was working great for a couple weeks, then it broke overnight, strangely while i wasn't using it. With a digital camera i can see the IR still coming out and a red glow on the diode itself, so the diode is working, but it seems the Yag or KTP has broken. I pulled as much of the lens assembly out as possible, but haven't gotten down to either the Yag or KTP yet. What are the chances they came unglued instead of cracking?
 





aryntha

aryntha

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Hey, good for you, for using a digital camera to view it. Thank god it wasn't another "I looked in it and saw a dim red glow" post.

Anyways, Have you tried warming it up in your hand --- for a while --- to see if it changes? It easily could be a temperature problem.

However I know a lot of these lasers -do- use glue to hold the KTP in place. I'd bet on that much more readily than the crystal actually cracking.
 
M

MysticNinja

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Heh, feeling kind of stupid here. I checked the batteries first thing, of course. One was 85% and the other 75%. Figured that had to be good enough. After getting all the housing sections apart(really nice design on this by the way, each lens and the crystal are in their own threaded section, with no thread-set, so disassembly is very easy, and safe to do repeatedly) i found the crystal intact. So, after aligning the lens a bit better and reassembling, I changed the batteries. Seems fine, plus increased output from the lens alignment. I summed the voltages on the old batteries and found 2.4v, so the driver must not have any step up, and the diode must have a very hard 2.5v threshold, because it literally went from working fully to no output in 15 seconds. Thanks for the suggestions, I'm thinking about a new driver with some step up ability, but for $24, this pointer is still very sweet. I've seen a couple showing 75mW or more WITH IR filtering.

Aryntha, yes, I'm new to these miniature "dpss" pointers, but I've had HeNe's and IR DPSS Bricks(had a watercooled 60W until the power supply died. Who can afford to buy a 2.5v 90A transformer twice?) for a long time. Proper lab safety procedure is definitely in my repertoire. I used to use a web cam that i removed the IR filter from, but there's no driver support for it in Vista or 7 anymore, so thank god for inefficient IR filters in cheap digital cameras.

Update(If anybody cares): After the lens alignment, it's now punching holes in black tape at 2 feet in 3-5 seconds. It wouldn't burn at all before.
 
Last edited:
G

Gordinflas

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Feb 15, 2010
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MysticNinja said:
Heh, feeling kind of stupid here. I checked the batteries first thing, of course. One was 85% and the other 75%. Figured that had to be good enough. After getting all the housing sections apart(really nice design on this by the way, each lens and the crystal are in their own threaded section, with no thread-set, so disassembly is very easy, and safe to do repeatedly) i found the crystal intact. So, after aligning the lens a bit better and reassembling, I changed the batteries. Seems fine, plus increased output from the lens alignment. I summed the voltages on the old batteries and found 2.4v, so the driver must not have any step up, and the diode must have a very hard 2.5v threshold, because it literally went from working fully to no output in 15 seconds. Thanks for the suggestions, I'm thinking about a new driver with some step up ability, but for $24, this pointer is still very sweet. I've seen a couple showing 75mW or more WITH IR filtering.

Aryntha, yes, I'm new to these miniature "dpss" pointers, but I've had HeNe's and IR DPSS Bricks(had a watercooled 60W until the power supply died. Who can afford to buy a 2.5v 90A transformer twice?) for a long time. Proper lab safety procedure is definitely in my repertoire. I used to use a web cam that i removed the IR filter from, but there's no driver support for it in Vista or 7 anymore, so thank god for inefficient IR filters in cheap digital cameras.

Update(If anybody cares): After the lens alignment, it's now punching holes in black tape at 2 feet in 3-5 seconds. It wouldn't burn at all before.
Click to expand...

Could you please upload some pictures about disassembly?
 
BShanahan14rulz

BShanahan14rulz

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Yes, those particular greens are very picky. Mine works ok on Duraloops for a while, but still not as long as it should last. On some no-name pile alkalines fresh out of the bin, it lasted a good 3 or 4 minutes.

If you have a lithium ion cell, try that. I wouldn't try it at full charge w/o a diode to drop some voltage, but in my experience, this laser works great with a li-ion.
 
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