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RE: Fresnel lenses again

From: T.L.G.vanderLinden
To: KellySt; kgstar; stevev; jim; zkulpa; hous0042; rddesign; David; 
lparker; bmansur
Subject: Fresnel lenses again
Date: Friday, March 08, 1996 4:32PM


>Another problem that we haven't thought of when using mirrors or lenses is
>that they absorb some of the energy of the beam, this changes the density 
>the lens/mirror. The result is that unwanted bumps arise and that the
>focus-distance changes.

Density change?  Why would the lense/mirror, have a change in density.  Or 
are you talking about changing the density that the design calls for?  Why 
would there be bumps?