They employ a water cooled 19 emitter bar laser that points in the opposite direction of the laser output.
The diode has a fast axis correction lens glued to it, then passes through a pedestal mounted lens it then hits a large prism, which changes the lasers direction 180 degrees and it passes back over the top of the diode and optics and then passes through two very large cylindrical lens, and finally an output window.
This guys have a highly restricted water flow and many accidentally try to provide 20-80psi water leading to instant demise of the laser.
This module produces a long stripe not a focused point and was supposedly used for scanning applications.
Cyril Labeste of France is a cool guy and a ebay his id is cyrillium he will answer non inane questions about how hes has focused this lasers output to a spot.
THESE LASERS OR ANY 100'S OF MW TO 60 WATT LASER ARE DANGEROUS AS ALL HELL, HERES WHY
1) THESE WAVELENGTHS ARE ESENTIALLY INVISIBLE TO YOUR EYE THUS YOU DO NOT BLINK OR LOOK AWAY
2) WHAT APPEARS RED AND VISIBLE IS REALLY 10,000 TIME BRIGHTER THAT IT WOULD SEEM TO BE
3) GOGGLES OFFER NO REAL PROTECTION IF YOU AIM THIS AT A NON REFLECTIVE SURFACE JUST THE SPECULAR REFLECTION THROUGH A REALLY GOOD SET OF GOGGLES THAT ARE OPTICAL DENSITY 12-14 IS STILL GOING TO BE TENS TO 100'S OF TIMES WHAT IS REQUIRED TO BURN YOUR EYES SURFACE AND OR RETINAS
4) YOUR EYES ARE GREAT MAGNIFIERS ND CAN FOCUS THIS INFRARED ONTO YOUR RETINA TO MAKE A DIFFUSE REFLECTION INTO SOMETHING VERY DANGEROUS
5) IF YOU PLAY WITH FIRE YOU WILL EVENTUALLY GET BURNED THIS TYPE DAMGE CAN TAKE 7-45 Days to fully show itself!
6) NEVER EVER EVER EVER FUCKING LOOK AT THE INDIRECT YES INDIRECT SPOT OF ONE OF THESE LASERS IT IS SO MUCH MORE POWERFULL THAN YOU MIGHT IMAGINE