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Dealextreme 35mW module measurement

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dar303

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http://www.dealextreme.com/details.dx/sku.10004
I get 69mW at 360mA measured with a Coherent theremal pile sensorhead and driven by a D4drive.
I see no abnormal IR emission using a sony DV cam with nightvision.

Has anybody else actually measured this one or experimented with it, I wonder how high I can push it?

And finally for the "ok, but does it BUUUURN"-crowd: Yes, it stings skin! :)
 





Benm

Benm

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I've read people pushing it as hard as 100 mW output here, but i'm not sure how long it will survive that, if at all.
 
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dar303

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Thanks knimrod! I'll try to push it a little more when I have glued the cable properly to the metal casing.
 
knimrod

knimrod

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dar303 said:
Thanks knimrod! I'll try to push it a little more when I have glued the cable properly to the metal casing.
Click to expand...


Be careful and proceed at your own risk. I originally pushed the power way up there because of a review that claimed a larger MCA and diode. After my post mortem, I didn't find this to be the case. Pushing the current up into the 400mA area is not going to be without some considerable risk IMO.
 
MarioMaster

MarioMaster

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but what they do have is much better cooling versus a handheld pointer, but yes i'm not too sure how good it is for running all the time at 100mW
 
Benm

Benm

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I doubt additional cooling will do much good.. i'm not sure what you'll blow up first by overdriving it, but chances are the failure mode is optical - either the pump diode or one of the coatings on the crystals, or the glue in between. In those cases a few degrees extra cooling won't give you much extra room to play with.
 
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dar303

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Your propably right, the optical components are not built to take that kind of powers. Do anybody know what max current that type of IR-diode can safely handle?
Maybe a realistic max power would be 70 or 80mW for this module, that isn't bad either!
 
Benm

Benm

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It's hard to tell without having the diode specs. The pump diode is likely a multimode with a relatively large emitting area though, which makes it less sensitive to sudden death from COD than the red diodes from dvd burners and such. It'll still degrade from too much currents like LED's do, but i guess the life-vs-power graph isn't that steep.

The crystal assembly is likely to be the limiting factor on a short timescale, but unfortunately those have larger tolerances between individual units.
 
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