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How's this for a nonconstructive activity? I went to the trouble of combining red, green, and blue beams. Then I took them apart again. But it sure is sexy. OH yes.
Start with your typical (or not so typical) white beam:
And add smoke and various diffraction gratings
Total output was around 300mW
Start with your typical (or not so typical) white beam:
And add smoke and various diffraction gratings
Total output was around 300mW