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i think those are 500mw, i hv tryed 1w blue laser, they broke within 3 day....so i bought 500mw, but didnt test
I wasn't asking about the ones in the OP...
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i think those are 500mw, i hv tryed 1w blue laser, they broke within 3 day....so i bought 500mw, but didnt test
I don't want to thread hijack, but yes, Infinitus. The lab in China that assembles them for me will tune them to any power that I request and these are tuned to 5mW, IR filtered. The IR filter makes a huge difference for low powered green modules (it more than doubles the apparent brightness).
I'm not buying my lasers off of ebay, I am buying modules that are made specifically for this purpose, so there is no reason for anyone to lie in this case. Plus, the one laser that I did have tested by a 3rd party was exactly the power they said it would be. I am 99.8% sure that these 5mW modules are truly 5mW.
Well, as I understand it, an unfiltered low powered green produces over 60% of it's light output in IR. The LPMs test the total light energy outputted (green + IR), so when you drop the IR output to around 3% rather then 60% by filtering, and then tune the laser to 5mW that is something like 4.9mW of green light and perhaps .1mw of IR. Without the filter it would be something like 3mW of invisible IR and 2mW of green. So the IR filter more than doubles the visibility without increasing the burning power of the laser at all.
The 5mW IR filtered modules actually draw a bit more power then the 10mW non-IR filtered modules I bought a year ago. They are tuned higher, but most of the invisible light that has no purpose except to cause potential eye damage is being absorbed by a tiny scrap of plastic before ever exiting the laser.
60% is kind of a lot. Most green lasers I LPMed are in the 10-35% IR content range, some less, but I have not seen over 50% yet, maybe I've been lucky.
Your understanding is just a little bit off though. The IR filter just blocks off IR light, it does not in any way increase, or decrease the amount of green light passing through, except to maybe also filter out a small percentage of the green.
Regardless though, I'm glad your modules are 5mW, IR filtered
I read your explanation. Get yourself an LPM, or get those modules LPMed independently than feel free to imitate this smiley after - :banghead:
I don't want to thread hijack, but yes, Infinitus. The lab in China that assembles them for me will tune them to any power that I request and these are tuned to 5mW, IR filtered. The IR filter makes a huge difference for low powered green modules (it more than doubles the apparent brightness).
The IR filter shouldn't make ANY difference at all with regards to brightness though. If anything, since no filter is perfect, a green laser without an IR filter should appear brighter.
The IR filter just blocks off IR light, it does not in any way increase, or decrease the amount of green light passing through, except to maybe also filter out a small percentage of the green.
Regardless though, I'm glad your modules are 5mW, IR filtered
I think that emoticon is appropriate, since if you had read my explanation you would know that an LPM should read the same 5mW whether the laser has an IR filter or not (assuming it has been properly tuned). However, the IR filtered laser will appear brighter.
Burning power, in this case, is just an unwelcome side effect.