Small Laser Turret for your "Killer Robot"
The business end with the round heat sink is a 445 nm (blue) laser that is good up to about 2 watts maximum. I turned out the laser heat sink on my lathe. I found the driver was getting hot, especially when I raised the power, so I decided to put that in a heat sink as well. The cool looking heat sink holding the driver circuitry is off an old printer's print-head. It just begged to be added to the laser to make a finished product that is reminiscent of some sort of turret gun on a space warship from Star Wars or Battlestar Galactica.
Oh the white ring is some of the (zinc oxide) heat-sink compound that is showing. I used it liberally all around.