Hi, 
 maybe somebody who knows about goebel mirrors can have a look at this
picture
http://www.labx.com/v2/adsearch/morepics.cfm?chpics=1&adzone=388000&pic=388529&cn=3&adnumber=388529

and tell me what kind of mirror system this is; I know that the housing contains
a single mirror which let's me believe that a diffracted parallel beam is
produced (parabolic type); however, the beam collimators indicate that it may be
an ellipsoidal type (single reflection) mirror which I am actually interested
in;  also, I remember from a discussion that those mirror surfaces degrade, in
other words, is that the reason why people get rid of it?

Thank you

L. Keller

CAMET Research

Goleta, CA

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