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Is something approaching 1W of 532nm possible in a big handheld ?

Meatball

Meatball

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I've seen a 1W portable green available for sale in a products list before. There was even a thread here about it.. and yes, it uses a 5W diode. The company rep posted here to answer questions about it.

How they regulate the non-linear optics relative temp?? I have no clue.

They might need more battery current for a TEC!
 





Eudaimonium

Eudaimonium

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DTR said:
Hey Eudaimonium

I actually have a few of the A123 Lifepo4's on order. I was just thinking since their recommended fully charged state is 3.6V can I charge them with my normal 18650 charger?
Click to expand...
Actually I have no idea :D You should look into Li-po charger for those, don't improvise with these cells, they hold incredible power inside them, and should be treated with respect.
brtaman said:
Eudamonium:

Yes...I calculated the required input power to achieve an output of 5W, based on the 6A figure provided by you...

Believe it or not but there is a whole world of brand name 18650 cells available out there (LG, Samsung etc...), which do come in in the capacity I mentioned and beyond. I own two DX cells, which as you mentioned are indeed complete crap...I power all my lasers from Samsung 2600mAh cells. I wouldn't trust a DX cell over .5C imo. Name brand on the other hand...lovely! BTW: A great source is a laptop which doesn't charge anymore...generally too expensive to fix...but can be powered through cord...battery pack is then useless and viola... very decent 18650 cells!

I don't disagree that a D-cell would be superior in terms of high current applications...what I am disagreeing with is the statement in the post I quoted.

Would a 18650 powering a 5W pump diode be ideal? Absolutely no, but it is more than possible.

Yes LiFe batteries are indeed quite nice, problem is capacity TBH, they are superior to LiIon in every other way. However I fail to see the relevance...
Click to expand...
I was more like thinking out loud what the posibilities here are, and I agree with you fully.

To me , usually "not ideal" means a general "no go" hence it most certanly does not pay to have such a constructed laser, because , battery lifetime and duty cycles aside, drawing immense current from 18650's would be far from appropriate because as we have seen, unquality batteries tend to f*ck sh*t up.

Oh and, I know there are much more quality batteries available, problem is that the cash to me is not available :D
 
ossumguywill

ossumguywill

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Eudaimonium said:
1W of green would require a 5W pump diode, which needs just over 6 A to operate normally - way above any reccomended current draw from any 18650 if you want them to live over 1 hour. Or at least not explode agressively.
Click to expand...

This is easily doable with 2 18650, maybe even one if you used an unprotected. Protected AW 18650s (basically the best) will give you 5A continuous (safely). Two of them will give you an average of 7.4v*5A, or 37 watts. Assume only 80% driver efficiency, that gets cut down to 29.6 watts. Assume your diode is only 20% efficient, you get an IR output of almost 6 watts. These are all basically worst case scenario numbers, best case scenario a single unprotected AW 18650 would be able to handle it without permanent damage.
 
Eudaimonium

Eudaimonium

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ossumguywill said:
This is easily doable with 2 18650, maybe even one if you used an unprotected. Protected AW 18650s (basically the best) will give you 5A continuous (safely). Two of them will give you an average of 7.4v*5A, or 37 watts. Assume only 80% driver efficiency, that gets cut down to 29.6 watts. Assume your diode is only 20% efficient, you get an IR output of almost 6 watts. These are all basically worst case scenario numbers, best case scenario a single unprotected AW 18650 would be able to handle it without permanent damage.
Click to expand...
Dude, we already concluded it's doable and I was already corrected. Problem with that is that there are many other alternative way other than 18650 to power it, which would be a better choice.
 
oic0

oic0

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brtaman said:
Eudamonium:

Yes...I calculated the required input power to achieve an output of 5W, based on the 6A figure provided by you...

Believe it or not but there is a whole world of brand name 18650 cells available out there (LG, Samsung etc...), which do come in in the capacity I mentioned and beyond. I own two DX cells, which as you mentioned are indeed complete crap...I power all my lasers from Samsung 2600mAh cells. I wouldn't trust a DX cell over .5C imo. Name brand on the other hand...lovely! BTW: A great source is a laptop which doesn't charge anymore...generally too expensive to fix...but can be powered through cord...battery pack is then useless and viola... very decent 18650 cells!

I don't disagree that a D-cell would be superior in terms of high current applications...what I am disagreeing with is the statement in the post I quoted.

Would a 18650 powering a 5W pump diode be ideal? Absolutely no, but it is more than possible.

Yes LiFe batteries are indeed quite nice, problem is capacity TBH, they are superior to LiIon in every other way. However I fail to see the relevance...
Click to expand...

They arent as expensive as they used to be either. I was looking for a new 9 cell my MSI wind to make it last forever on battery power, only $40. which comes out to $4.40 per cell. Not sure if its 18650s inside, but if it is, its worth buying just to rip apart.
 
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