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06-21-2017, 05:05 PM #1
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VioletGiraffe
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How to roughly estimate the beam power of a 532 nm laser?

I just bought a [relatively] cheap 532 nm today. It's Chinese with no stated power rating to speak of. It draws 300 mA at 3 Volts, but that stat is of no use because it clearly has a linear current regulator inside (the current stays the same as voltage goes up beyond 3 V).

I assume it's a 5 mW toy, but I hope it could be more than that in practice. Is there any way, an experiment, to roughly guess its power? On the scale of 1-5-20-50 mW?

I seem to get a burning sensation if I cover the aperture with a finger or hand, but I'm not even 100% sure I'm not imagining it, it's so subtle. And I assume that if the sensation is real, it may well be from IR and not from the 532 nm light?..

Last edited by VioletGiraffe; 06-21-2017 at 07:40 PM.

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06-21-2017, 07:30 PM #2
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Re: How to roughly estimate the beam power of a 532 nm laser?

Long story short, you can't.
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06-21-2017, 08:18 PM #3
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paul1598419
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Re: How to roughly estimate the beam power of a 532 nm laser?

That is why they make laser power meters. You'll need one eventually if you even plan on knowing the actual power of your lasers.
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06-21-2017, 09:36 PM #4
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hakzaw1
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Re: How to roughly estimate the beam power of a 532 nm laser?

Try contacting a lab at nearest University--they have LPMs.
OR.. you may find a member close enough to visit and use their meter.

more.
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06-21-2017, 09:45 PM #5
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paul1598419
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Re: How to roughly estimate the beam power of a 532 nm laser?

I've had poor luck with contacting universities I am currently not attending to give me help. I tried when I was setting up my spectrometer. At least they called me back to say "NO". Finding a member who has an LPM is a great idea, though.
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06-21-2017, 09:52 PM #6
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Re: How to roughly estimate the beam power of a 532 nm laser?

300mA at 3V is 900mW. The driver is likely linear, and the pump diode is 2Vf, which gives roughly 600mW to the pump diode. IR pump diodes at this power are at most 50% efficient, so you have at most 300mW of output power. We have absolutely no idea how much of this is converted from here, as conversion efficiencies vary wildly based on too many factors to list. The most you could hope for is ~30% for CW, but you also know nothing about the IR leakage. We can say the output is less than 300mW in some unknown ratio of green and IR, but anything beyond that is a practically useless guess. My practically useless guess is 20mW of green.
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06-21-2017, 09:52 PM #7
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hakzaw1
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Re: How to roughly estimate the beam power of a 532 nm laser?

yep... hopefully he will make an 'intro' post and find a local member (lpm owner)---unlikely but who knows??
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06-21-2017, 10:50 PM #8
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Re: How to roughly estimate the beam power of a 532 nm laser?

Quote:
 Originally Posted by VioletGiraffe I just bought a [relatively] cheap 532 nm today. It's Chinese with no stated power rating to speak of. It draws 300 mA at 3 Volts, but that stat is of no use because it clearly has a linear current regulator inside (the current stays the same as voltage goes up beyond 3 V). I assume it's a 5 mW toy, but I hope it could be more than that in practice. Is there any way, an experiment, to roughly guess its power? On the scale of 1-5-20-50 mW? I seem to get a burning sensation if I cover the aperture with a finger or hand, but I'm not even 100% sure I'm not imagining it, it's so subtle. And I assume that if the sensation is real, it may well be from IR and not from the 532 nm light?..
This site may help.
https://www.repairfaq.org/sam/laserioi.htm#ioihlpm

06-21-2017, 11:11 PM #9
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hakzaw1
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Re: How to roughly estimate the beam power of a 532 nm laser?

ANY Links to Sam get a +rep bump _(+79)
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KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
HeNes-(12)R(3)G-COH-594/5 mW-thnx DrSam
MULTILINE-147mW[
445nm 180mW-Mini spiro-Yob.
Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
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06-22-2017, 12:49 AM #10
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paul1598419
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Re: How to roughly estimate the beam power of a 532 nm laser?

Yes. Sam Goldwasser is the man to look for in all things laser related. The best thing you can do is put a link to it permanently in your browser. To read it all would take a huge chunk out of your life, but it is the best compendium of laser related material in one place that you will ever find.
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06-22-2017, 12:36 PM #11
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lasersbee
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Re: How to roughly estimate the beam power of a 532 nm laser?

Quote:
 Originally Posted by VioletGiraffe I just bought a [relatively] cheap 532 nm today. It's Chinese with no stated power rating to speak of. It draws 300 mA at 3 Volts, but that stat is of no use because it clearly has a linear current regulator inside (the current stays the same as voltage goes up beyond 3 V). I assume it's a 5 mW toy, but I hope it could be more than that in practice. Is there any way, an experiment, to roughly guess its power? On the scale of 1-5-20-50 mW? I seem to get a burning sensation if I cover the aperture with a finger or hand, but I'm not even 100% sure I'm not imagining it, it's so subtle. And I assume that if the sensation is real, it may well be from IR and not from the 532 nm light?..
Maybe someone on the Forum has a similar
one that has been power tested...

"Cheap 532nm Chinese Laser" is just not
enough info.

Jerry
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06-22-2017, 02:39 PM #12
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diachi
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Re: How to roughly estimate the beam power of a 532 nm laser?

At 300mA current consumption your highest possible green output is somewhere around 100mW. Slope efficiency of the 808nm pump diode is usually 1mW/mA or there abouts. That gives you 300mW pump power. Highest conversion efficiency (best case) is 30%, leaving you with at most 100mW of 532nm out.

Realistically it won't be that efficient, so the actual output is likely somewhere closer to 50mW of green plus some IR.

Linking us to the laser you purchased, or providing us with a picture, could help us guess based on testing done by other people. There's really know way to know true output power for sure without an LPM.
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06-22-2017, 02:53 PM #13
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VioletGiraffe
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Re: How to roughly estimate the beam power of a 532 nm laser?

The reason I provided no link is that I bought it offline, it's noname, and the markings are useless: <1000 mW (I don't doubt it's less than 1000 mW!), class III (not IIIa or IIIb, just III).
I doubt it's 50 mW, but I'll be happy if it's 20 and not 5 or even 1.

Also, I understand you need a proper measurement device to measure power precisely. That's why I used the term "estimate". After all, measurement means comparing something to a reference, and I could think of a number of possible observable effects that can be used. For example, the thickness of a certain sheet material that the beam is able to penetrate / shine through. Heck, a number of sheets of 80mg/m2 white office paper in a stack that the beam remains visible on the other side of is not the worst metric, should be reasonably reliable and reproducible. Or am I wrong?

Last edited by VioletGiraffe; 06-22-2017 at 03:21 PM.

06-22-2017, 06:09 PM #14
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paul1598419
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Re: How to roughly estimate the beam power of a 532 nm laser?

That particular pointer is of very low power. I have one that does about 30 mW to maybe 40 mW. They can be had in quantities of three. A red 660nm or 635nm, a 532nm and a 405nm for less than \$10.00. They run on two AAA batteries and for the price, aren't a terrible deal if they all work when they arrive. Be careful of them as they tend to have problems with the switch after some time. As far as using office paper to measure the output power of lasers, it doesn't account for the energy density in the beam profile. Also the eye cannot make these judgments as the farther away from 555nm, the less the eye can see of the light. a 405nm is a perfect example of this as it is not a particularly visible wavelength.
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445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
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650nm 380mW 501B
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Scientech Vector S310 with AC2500 10 Watt LPM
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Last edited by paul1598419; 06-22-2017 at 06:19 PM.

06-22-2017, 06:37 PM #15
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VioletGiraffe
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Re: How to roughly estimate the beam power of a 532 nm laser?

Quote:
 Originally Posted by paul1598419 They can be had in quantities of three. A red 660nm or 635nm, a 532nm and a 405nm for less than \$10.00.
Where?! O_o

Also, 30 mW is just about what I need. I suspect this one is less. But since I have no reference to compare to, I can't say.

Also, I obviously wasn't talking of comparing different wavelength lasers. Only of the exact same wavelength.

06-22-2017, 06:46 PM #16
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BowtieGuy
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Re: How to roughly estimate the beam power of a 532 nm laser?

Here you go, 3 piece RGB laser set for \$4.99 on ebay plus \$1.99 shipping, still less than \$7.00!
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