Hello, i am new, check out my photos on 445nm 1 watt laser with BIG LENSE, focal lenght of 6 feet. Burns wood in less then 1 sec. Not bad for quality optics. Lenses came out of semiconductor industry, photo stepper, got on line at auction site. Lense is 19 inches long and with output opening of 5 inches. The input side is 3 and 1/2 inches. Beam focus into nice round dot.
COOL LASER
COOL LASER