Subject: Is there a way to alter the color of a laser after it left laser cavity?

Is there any way to change the frequency and ultimatly the color of a red laser 
after it has left the laser cavity.  I am in the 8th grade and I am using a 
normal red laser pointer.  I do not want to have to take apart the laser and 
replace the lasing medium.  I would never get it back together.  It has an all 
metal shell and I would have to cut it.  If you can think of no other way but 
to do this please tell me anyways.  I am very capable.  I was thinking that 
there may be a substance that can alter the frequency of the beam by merely 
shining the beam on or into the substance.  Any help would be appreciated.  
Thank you.

Re: Is there a way to alter the color of a laser after it left laser cavity?