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Old 07-20-2017, 08:27 PM #1
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Default 520nm laser pointer powered by AAA?

I'm looking to buy a 520nm laser diode pen style pointer powered by common batteries like AAA or AA. Do they exist?

The reason is I plan to use this once in a while at star parties and I only turn them on very briefly to avoid too much disruptions. So there is no need for long duration lithium rechargeable batteries. Rather I prefer the convenience of AAA or AA which I have alot of at home.

I see laserland has a 520nm laser pointer on ebay for $24 but it uses 16340 batteries.

o-like has a $99 120mW for $99 and uses 18650.

I already have DPSS green pointers using AAA. They work fine but I just want to have a laser diode version.

Any suggestions?


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Old 07-20-2017, 08:34 PM #2
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Default Re: 520nm laser pointer powered by AAA?

Not aware of any commercially produced, although maybe someone else is? I'd need to do a little searching.

I built my 515 to run on 2x AAA, although opted for the Lithium primary cells (not rechargeable) from Energizer. Found regular alkaline AAA batteries did not last long under the load.
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Old 07-20-2017, 08:53 PM #3
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Default Re: 520nm laser pointer powered by AAA?

This eBay seller sells some 515 pointers that run on AAA, I have this exact one in my signature. They tend to hover in the mid 10mW's mark in terms of power, so you'll be able to see some beam at night!

Non-Focusable 515nm Grass Green Laser Pointer Pen for PPT Presentation 515P-10

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Old 07-20-2017, 08:53 PM #4
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Default Re: 520nm laser pointer powered by AAA?

Take a look at these, they're not cheap, but they may be what you are looking for, it's powered by two AAA batteries.

SKY 30mW-50mW 3-Mode 520nm Green Laser Pointer Pen (Black)
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Old 07-20-2017, 09:57 PM #5
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Default Re: 520nm laser pointer powered by AAA?

Considering the price of the alternatives, I'd opt for the LaserLands pointer which I got it an auction for $17.00. They do take 2 16340 Li-ion batteries, but at the power they are set at, will last a very long time between charges. I have to believe that the other two options wouldn't last long on AAA alkaline batteries.
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Old 07-20-2017, 11:44 PM #6
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Default Re: 520nm laser pointer powered by AAA?

Quote:
Originally Posted by lazylazer View Post
I'm looking to buy a 520nm laser diode pen style pointer powered by common batteries like AAA or AA. Do they exist?

The reason is I plan to use this once in a while at star parties and I only turn them on very briefly to avoid too much disruptions. So there is no need for long duration lithium rechargeable batteries. Rather I prefer the convenience of AAA or AA which I have alot of at home.

I see laserland has a 520nm laser pointer on ebay for $24 but it uses 16340 batteries.

o-like has a $99 120mW for $99 and uses 18650.

I already have DPSS green pointers using AAA. They work fine but I just want to have a laser diode version.

Any suggestions?
I suspect Paul's reply is correct. If that is true then you'll in the long end up spending more money on batteries then you would on li-ion.
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Old 07-20-2017, 11:51 PM #7
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Default Re: 520nm laser pointer powered by AAA?

You know while I was measuring the wavelength of these SB1573N91 Sharp diodes, I also measure my LaserLands pointer and it was rock steady at 510nm for over a minute before it started to rise slowly. That is a pretty nice shade of green. Not any yellow in it compared to a 532nm.
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Old 07-21-2017, 12:52 AM #8
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Default Re: 520nm laser pointer powered by AAA?

OP, you might have a much easier time picking out a 520nm laser that uses one 18650, and instead of the 18650 using one of these:



It's a 3xAAA to 18650 adapter, and they're all over the internet. Try eBay, alibaba, etc. At least that way you can run most standard 18650 lasers from AAAs (given <~500mW?), and you've also got a much larger selection to choose from vs AAA native devices.

I don't know how long they would last though, definitely not as long as an 18650.
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Old 07-21-2017, 01:13 AM #9
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Default Re: 520nm laser pointer powered by AAA?

EP, that's a good alternative if you are strictly limited to AAA batteries. As you mentioned, I've got to believe that they wouldn't last anywhere near as long as an 18650 cell.
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Old 07-21-2017, 03:19 PM #10
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Default Re: 520nm laser pointer powered by AAA?

Definitely not. A good AAA alkaline has 1000 mAh capacity or so, at a discharge rate of 100 mA (i.e. over a 10 hour period). By the time you discharge it with 1 amp that capacity drops quite a bit, i would not expect to work over half an hour (though it "should" work for a full hour based on capacity).

I'm not sure how much current your laser will draw, but it's something to consider.
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Old 07-21-2017, 06:12 PM #11
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Default Re: 520nm laser pointer powered by AAA?

Would depend on the driver's minimum input voltage, as the three AAA will drop as they discharge. I doubt you'd get more than half its capacity. But, that's just a guess.
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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
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532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
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808nm 1+W infrared laser
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Old 07-21-2017, 06:24 PM #12
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Default Re: 520nm laser pointer powered by AAA?

Thank you all. Very useful info.
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Old 07-22-2017, 01:26 AM #13
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Default Re: 520nm laser pointer powered by AAA?

@Paul, that's another issue indeed, the minimum input voltage the driver would accept.

Considering i supopse it's boost switchmode solution here it would probably cut off at 3.0 or 2.5 volts to save a lihtium battery, which is not -that- bad for 3 alkalines in series. Especially if the load is not that high (few hundred mA at best) a cut off at 2.5 vots (0.8 per cell) would get most of the energy out of an alkaline cell.

If you wanted to use NIMH AAA cells things would be even better, those don't drop under 1.2 volt a cell until almost completely depleted, typical lithium protection may even risk over-discharge there if the cells are not well matched.
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Old 07-22-2017, 04:50 AM #14
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Default Re: 520nm laser pointer powered by AAA?

The other problem here is that with the Vf of the diode being fairly high, a boost driver must pull more current to supply the diode and so will run the batteries down much faster than diodes with a lower Vf. I don't see those AAA lasting very long at all.
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Old 07-23-2017, 12:35 PM #15
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Default Re: 520nm laser pointer powered by AAA?

This illustrates an issue you may have.
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Old 07-23-2017, 02:26 PM #16
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Default Re: 520nm laser pointer powered by AAA?

Quote:
Originally Posted by dden4012 View Post
This illustrates an issue you may have.
Good idea.
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