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150mW green pen module with one 10440 lithium

KAR

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I want to build a short green laser pen with a 150mw module and was wondering if I can run it with a single 10440 Lithium battery at 4.2 volts. If the voltage is too high, is it possible to turn the pot down a little to reduce power to the diode? Or will the higher voltage burn out the driver? I've been using this configuration with the 405 laser pens and really like the compact size. Any other thoughts on how it could be done?
 





Tech_Junkie

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All 3.7v batteries are 4.2 when fully charged. So if your module can handle 3.7v you're all set. If it can only handle 3.0v you may, or may not have an issue. Most times you wont, but you'll never know till you try.

And no, messing with the pot wont change anything.
 
KAR

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Thanks for the reply. The module I bought is 3v so I guess it's a bit of a gamble putting a 3.7v battery on it. So turning the pot down won't help?
 
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Tech_Junkie

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The pot only regulates the current going to the diode. The driver regulates the current from the batteries. So you'll most likely fry the driver. I'd try it on a cheap 5mW pen. They are mostly over spec, and if you fry it you're only out $9. If it lives, then you'll have a better idea on how long it will last.
 
KAR

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That's good advice. I will order some cheap ones for testing. Thanks again.
 
Eudaimonium

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Actually you cannot use 150mW (real 150mW) module with 10440 battery, you see such a module would likely draw somewhere around 700-800mA of current (possibly 1A in bad modules) and it will result in decreased life of 10440 cell, as they are all around 300mAh, and maximum safety discharge current for all lithium ion cells is 2C, so you should not go over 600mA on those.

Sorry, but idea is wrong from the start.
 
KAR

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Well I'm not sure that the one I ordered will put out an honest 150mW but I will put a meter on it to see how much current it draws. If it is too much, then I will scale down my goal a little to maybe 50mW.
 
Eudaimonium

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Just make sure it does not draw over 0.5 A from your 10440 cell. Although 0.6 may be good, your battery cycle time will totally suck, you'll spend more time recharing your battery than using it.

When it comes to pen lasers (AAA and 10440), I always say that 100mW is the upper limit for that. 150mW is way too much, heatsinking problems and battery lifetime sucks.
 
Tech_Junkie

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KAR said:
Well I'm not sure that the one I ordered will put out an honest 150mW but I will put a meter on it to see how much current it draws. If it is too much, then I will scale down my goal a little to maybe 50mW.
Click to expand...

How much did you pay for the 150mW laser, and where did you get it?
 
HIMNL9

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Uhm ..... it say "less than 350mA at 3V", in the spec ..... a bit too low for 150mW green output, if true .....
 
Tech_Junkie

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Yeah thats not 150mW. You'll be lucky if its over 80mW. The 10440 battery should be fine.
 
KAR

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midias said:
I got one of these it was about 115mw not bad but it should be what you are looking for

Focalprice.com offers 200mW 532nm Green Beam Laser Pointer with Keychain (Black) ,discount 200mW 532nm Green Beam Laser Pointer with Keychain (Black),200mW 532nm Green Beam Laser Pointer with Keychain (Black) products,low price 200mW 532nm Green Beam
Click to expand...

Well that's pretty cool. Thanks for the link. If I had seen that yesterday I would have saved some money, and it's certainly easier. That 115mW I assume includes IR.
 
KAR

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Eudaimonium said:
If you really want the best bang for your buck, I'd reccomend O-like:
Welcome to O-Like.com, Your source for laser products

If you really want sheer power of photons and have $400 on hand that's really bothering you, get this:
400mW solid green laser module/adjustable/IR filtered [OL-532M-400] - $319.99 : Welcome to O-Like.com, Your source for laser products
:na:

Anyhow, check out their selection of green modules.
Click to expand...
Oh man don't tempt me. That 400mW module is nice. I would probably be more interested in this:

450mW New portable Green laser torch/IR filtered [OLNGL400] - $389.00 : Welcome to O-Like.com, Your source for laser products

It's slightly more money but it's already in a host. I will own one of those...soon I think.

I just spent nearly $400 on high powered lasers this month (yobresal 1.2W 445, and an Optotronics 150mW pen) and would probably feel guilty for spending that much again so soon.

I still have this uncontrollable need for a small green 10440 powered laser in the 100mW range.
 
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