Quote Originally Posted by wondertwnz View Post
Just use a mirror on the shutter that takes the beam on to your base plate. that way it does not have all that heat build up.
Larry
Send the waste light into something tubular painted flat black on the inside that's mounted on the base plate. That'll also help absorb the stray light as well as the heat. Make your shutter flag a mirror angled to send the beam into that. Have the mirror come down into the beam from above for a gravity shutter type of thing as well.