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Old 04-10-2016, 02:20 PM #1
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Default Mix of interest and concern

Hi all,

Always loved laser pointers as a child ever since I got my first red pointer on a school trip overseas. I use them for presentation regularly and when I am on site as an engineer.

Also use my old one for mucking about getting the pets and toddler to chase them.

However, I recently got a second green laser "<1mw" as my old one got lost. Instead of a reputable company, I took a punt on eBay. As soon as I got the laser I knew something was up as it was many times brighter than any I had seen. Pointed it at my hand and to my surprise it burned me. Now I am not an expert but basic research told me <1mw should not burn anything. Further experimentation showed it lit matches and burned black plastic. A homemade laser power meter instructions picture (probably from here) gave me a reading of 113 mw. Horrendously dangerous considering that this may end up in the wrong hands due to the <1mw label. But if I said I wasn't kinda exited by it would be a lie.

Is this overpowered thing common with cheap imported lasers?

Cheers, Rich


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Old 04-10-2016, 02:42 PM #2
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Default Re: Mix of interest and concern

Yup, Chinese lasers like the one you bought are very often overspec.

If you want a real 1mw laser, you'll need to buy from somewhere with better quality control, like laserglow.
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Old 04-10-2016, 02:55 PM #3
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Default Re: Mix of interest and concern

Thanks for the info. Will buy a better non Chinese one I guess. Silly that I have to spend more to get less laser power!

You would think it would be the other way round!

Also told me that there might be a risk over over exposure to ir light in cheap models. Anyway to test if it has an ir filter?
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Old 04-10-2016, 03:14 PM #4
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Default Re: Mix of interest and concern

Selling LASER Collection
I'd recommend you buy the laserglow tech 5mw pen for $25 from this guy. It would be guaranteed <5mw and has an IR filter.
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Old 04-10-2016, 03:19 PM #5
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Default Re: Mix of interest and concern

Thanks but I am in the UK, the international shipping would make it a bit pricey I imagine!
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Old 04-10-2016, 03:59 PM #6
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Default Re: Mix of interest and concern

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Originally Posted by Rich99 View Post
Thanks for the info. Will buy a better non Chinese one I guess. Silly that I have to spend more to get less laser power!

You would think it would be the other way round!

Also told me that there might be a risk over over exposure to ir light in cheap models. Anyway to test if it has an ir filter?
If it's cheap and green, it probably doesn't have an IR filter. There are ways to test, but unless you're buying a laser from a quality seller who advertises that the laser is IR filtered, it probably isn't.
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Old 04-10-2016, 05:14 PM #7
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Default Re: Mix of interest and concern

There is also laserbtb as they offer 532nm pointers that you can add an IR filter too (they install it) for a couple bucks. I have a bunch of them and they are pretty nice units.
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Old 04-10-2016, 06:14 PM #8
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Default Re: Mix of interest and concern

Thanks for the advice all
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Old 04-10-2016, 08:00 PM #9
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Default Re: Mix of interest and concern

Quote:
Originally Posted by Rich99 View Post
Hi all,



Further experimentation showed it lit matches and burned black plastic. A homemade laser power meter instructions picture (probably from here) gave me a reading of 113 mw. Horrendously dangerous considering that this may end up in the wrong hands due to the <1mw label. But if I said I wasn't kinda exited by it would be a lie.

Is this overpowered thing common with cheap imported lasers?

Cheers, Rich
PLEASE GIVE ME SOME MORE INFO /possibly a link to HOMEMADE LASER POWER METER???
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Old 04-10-2016, 08:03 PM #10
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Default Re: Mix of interest and concern

Quote:
Originally Posted by TheDroller View Post
PLEASE GIVE ME SOME MORE INFO /possibly a link to HOMEMADE LASER POWER METER???
Ah, found where it came from

See here

Simple Laser Power Meter Using IR Thermometer
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Old 04-10-2016, 08:31 PM #11
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Default Re: Mix of interest and concern

Honestly shocked you made a lpm and didn't find any info regarding over powered ebay lasers..
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Old 04-10-2016, 08:32 PM #12
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Default Re: Mix of interest and concern

FYI
by day 555nm 'looks' the brightest of all visible lasers (by night its 507nm) it takes 1W of 445 to look as bright as just 50 mW of 532.. (approx.)

When I joined this forum I very rarely saw any complaints about overspec==just the opposite-we were trying to 'pot mod' green pointer to get MORE overspec.. strange== hope you guys are not wanting a 'safe to shine into eye's' laser-- consider that to be impossible short of a dead laser..since no actual testing with laser into the eye's of humans --ATM we do not know just how much danger there really is...just be done with that and avoid all eyes all the time.

one way to test for IR-- shine your 532 thru your safety glasses and what passes in mostly the IR 'leakage'. and YES if cheap expect NO IR filter- 'techhood' sells them cheap as well.
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Old 04-10-2016, 08:43 PM #13
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Default Re: Mix of interest and concern

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Honestly shocked you made a lpm and didn't find any info regarding over powered ebay lasers..
I had all the bits already (engineer). Whilst google did show up some info, I thought I would get some more specific advice as I couldn't find info on a 1mw laser recording over 100mw plus I thought some might be academically interested.
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Old 04-10-2016, 08:47 PM #14
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Default Re: Mix of interest and concern

Now I'm gonna have to try making one.. thanks for the link.
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Old 04-10-2016, 09:26 PM #15
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Default Re: Mix of interest and concern

Well, gonna buy another one from the same seller as only a couple of quid to see what power that one puts out as I have the meter ready.

If that one is also over powered I will notify the authorities/trading standards.

Very disappointed these are available for 2 delivered with no checks.
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Old 04-11-2016, 08:24 PM #16
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Default Re: Mix of interest and concern

welcome to LPF
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