If you’re like me, you tend to go a little Clark Griswold every Holiday Season.

My current favorite holiday lighting apparatus is those sassy red/green laser projectors!

But how do they work?

It turns out they’re actually pretty simple.

Lasers, some funky hair, and Bob’s your Uncle…


You’ll have to forgive the explanation of diffraction gratings. The truth is, it’s a hairy subject involving diffraction, refraction, constructive interference, destructive interference, blah blah blah…

Don’t want to make anyone’s head explode on Christmas Eve, though, including mine.

But, you get the idea!

And now I’m off to drink some eggnog and grow my hair out like Huygens… 😉

Merry Christmas!

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