Why does a ruby,(red), laser disappear only through a blue filter?

Subject: Why does a ruby,(red), laser disappear only through a blue filter?

Date: Thu Nov 11 20:48:23 1999
Posted by Clayton Knight
Grade level: 4-6 School: Perdue Elementary
City: Warner Robins State/Province: Georgia Country: U.S.A.
Area of science: Physics
ID: 942371303.Ph

Message:


I noted your entries on the effects of color filtering a red laser, but my 
students want to know exactly why it disappears only with the blue filter. 
I think it relates to a color shift into the ultraviolet or even infra-red 
spectrum, but to be honest I am stumped!

Re: Why does a ruby,(red), laser disappear only through a blue filter?

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