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To me the most important thing in 26650 Li battery is safety - what means that IC protection works well and it would not take fire if short-circuited by accident. That is why recently I have purchased some brands from ebay and ali and tested the cut off currents. Trustfire from ali - 7.5A XTAR...

Peter, I think that these NUBM3x MDP chips with so close beams are made for cutters and there is no way to find optics to correct the beams = decrease the divergence to the level a long range laser could be made. So people use them to focus and burn like I did too, and 100W well focused can melt...

In the thread about this driver I have warned you that it is a crap!!! https://laserpointerforums.com/threads/driver-for-nubm31-and-for-similar-mdp-chips-sold-on-ebay-ali.107991/

Bob, do you also want a beam expander for NUBM31? I made me one, but it is too small and does not accomodate all the beams of the expanded pack. Trinh, how did you manage to make this ebay driver work? I bought 3 of them and none is working at all !!!

I would like to write to Thorlabs but the email given for requests on their site seems to be "not existing" even after I enter into my account. If you are in Germany, could you try to write or call them and ask why do not they sell OC PBS for 450nm?

BTW does anyone have info about what 26650 battery is the safest in case there is a short curcuit in my torch or laser? What means it would cut-off if current surpasses 10 or 20 A. Most of people in forums is looking for fast charging, higher capacity, higher discharge current... but for me all...

To Junkers and FAP: After my inquiries the seller added this Optically Contacted PBS to his shop: https://www.aliexpress.com/item/1005002694827669.html?spm I do not understand why the damage threshold is given for 1064nm. But I am going to buy one cube and check it out. And why Thor does not...

Hi Brilliant, I do not think that the driver you use is bad if you can afford to buy another NUBM31 once yours is burnt (like I do). It is just not perfect. 3 years ago I used a similar one with LCD screen to drive the block of NUBM08 here...

Test load: yes, I have big 1000W resistor you saw on pictures. But what I also want is to check 10A protected 26650 batteries from ali - at what current do they really shut off. So finally I think to buy this - as one test load for all...

Hi guys, Please stop arguing and let us talk some essential topics: Brilliant: You say your 18650 can give 8-10A. How many A did your ammeter show at full power? Do the batteries heat when on? Are they protected? If so, did you test the current where they shut off? In LiPo batteries I do not...

Likevii was doing something like this: pumping phosphor with 300W from 3x NUBM31 combined.

The CPU cooler on the picture is also massive. It will not enter into a small gun. What are the dimentions? Looks like 120mm fan to me.

Here is another experiment: knife edging of two beams from these 2x NUBM36. I made 3 Al prisms and glued 4 mirrors on them to make a set up with something like this https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6760 in the middle. To my understanding it was an easy way to KE 2...

Yes, in this sketch the beams enter the cube after a pretty long path, so I think they are well diverged at that point and have lost the initial power density. Due to this they do not burn the cube. This is what I meant by saying to maybe combine beams 20+ cm away of emitters. But if we want to...

Well, now I have finally burned my PBS after trying to give 3A current (full power) through all the emitters. So I put the thermal sensor on the top of the cube to see how much the PBS would heat and first at 1A current the warming was not very great: it just warmed up from 25 to 30ºC in 30...

BTW today I have tried to use a 400W driver for driving the whole block of NUBM31 (output 40V, 6A) from 24V input. The strange thing is that it could be set for such output with a test load (7 Ohm, 500W rated resistor) but once NUBM31 is attached to it it keeps blinking and immediately going...

Hi RA pierce, At 5cm all beams are about 1mm wide. Seeing the beam centers separation in NUBM36 is 3.5mm, you will only have 2-2.5mm to place the mirrors. The thinnest long mirrors I have found are ones taken from KE-block of A130. Their size is 25x5x1.1mm I saw you in the thread about...

Peltiers/TEC are awfully energy-unefficient things. When conducting heat off laser they produce 3-4 times more heat from the current flowing through them and in this way 3-4x more heat has to be handled in total compared to the situation without TEC.

Finally I had some time to do more experiments with this ice cooled "200W beamer". First I attached the thermal sensor on one of the chips (the 2nd one I think will heat the same) and filled the Al vessel with ice half full. Then after the T fell to 8ºC gave 3A current to each row. In my setup...

And how are you able to use this driver while we others can not???