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 == renaming == 

 I see the term disk laser is not good, because of many other meanings of the word disk, 
 at least in English version of Wikipedia. How about other languages, should we care of compatibility of terminology, 
 making the English version of wikipedia? 
 The term disk laser seems to appear first in the publication  

 by German colleagues (who are not native English speakers), 
 and this term does not correspond to the commnon meaning of word disk. 
 I consider to rename the article to active mirror, keeping disk laser as redirection.   

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