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Yes, I did it in a lab. Sorry, I didn't explain that very well did I? By adjusting the angle, I meant rotating the third polarizer to some angle other than that of the first and second. For example, the first would be adjusted to "0 degrees", the second would be perpendicular to that, "90...

When you polarize a laser beam, then polarize it again with a second polarizer - perpendicular to the first - no light comes through, right? But when you put a third polarizer in the lineup and adjust the angle, the beam reappears. Why is this? What makes it come back?

Which of those hosts would you say is best?

How did you get it for $14.99??

IR - Where exactly is it spewing out to? Is it just within the beam or does it diffuse out into open air? What I'm wondering is if standing near a beam or near the source can cause IR damage without taking a shot to the eye. I have done some searching and don't mean to post about something if...