Here are some more pictures/comments about my laser:
-it doesn't have a driver board, they simply use two pairs of massive copper(?) bars, the eigth individual diode bars (per wavelength) are wired in series. Switching is done via a transistor (blue arrow) on the positive side, other than this, a cap against ripple and a hall effect sensor to measure the current there's nothing directly connected to the input terminals
-it claims to be able to tolerate 250 mA ripple current (well, even the ripple current could power a nice laser), it looks like they just connected the input terminals to a big capacitor (the blue thing zip-tied to a diode bar)
-it can provide you three different wavelengths: one >1 mW 635 nm alignment laser (orange arrow) and two 915 and 980 nm diode arrays with 135 W each (i guess, it just states 270 W total). The entire setup you see on the pictures is duplicated on the bottom level, probably the array for the other wavelength
-each one of the four blocks contains two diode arrays, the beams get combined, pass a semi-transparent mirror with a power meter behind it (top left corner), pass a tilted lens(top middle, the large brass plate), go through a few dichroics and get combined with the other wavelength beam. They probably use another dichroic to get the 635 nm beam into the main beam
-nothing quite says "serious laser" like a watercooled(!!) fibre... Yes, those two blue hoses are there to cool the optical fibre. Why do i get the feeling that such a fibre assembly will probably cost more than my entire home lab?
-i still don't know the exact specs of this beasts as manuals are just non-existent. Judging from the model number (Optotools 270-30) and other lasers from the same company it seems like it's a 270 W, 30 mm mrad laser
-they "might" have overdone the thermal mass: Even though it is just 40x40x20 cm small it weighs 40kg... Well, at least it won't get toppled over accidentally
-i found this link to a evilbay offer for a similar laser from the same company: It just has one level so you can see the individual components more clearly:
https://www.ebay.com/itm/OPTOTOOLS-nlight-high-power-diode-laser-OTF-200-20-IP-DSO/174302584669