Originally Posted by
mixedgas
OD 1.5 , the density in IOBrien87's link, reduces the beam intensity by only 150 times. Not enough for most lasers in show service.
Steve
I maybe missing something, but I was taught:
each .3 of optical density (Absorbance) is roughly 1/2 the light. 1.5 optical density is 1/32 the original intensity. (1/10^density)
"There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso