Hybrid optical mirror

Abstract

A hybrid mirror for reflecting high power optical beams comprises a reaction sintered silicon carbide substrate to which is bonded a plurality of silicon faceplates containing a plurality of coolant passages.

1 . A cooled mirror comprising: 
 a ceramic substrate having a top surface;    a faceplate bonded to said substrate, said faceplate comprising at least one silicon plate having a plurality of coolant passages therein, that surface of said faceplate farthest from said top surface of said substrate being polished to an optical finish.    
     
     
         2 . A mirror according to  claim 1 , in which said substrate is formed from siliconized silicon carbide containing between 5 and 25 per cent free silicon and that one of said at least one plate of silicon closest to said substrate is bonded to said substrate by a metallurgical bond.  
     
     
         3 . A mirror according to either of claims  1  or  2 , in which said faceplate and substrate are bonded metallurgically with a bonding metal at a temperature in excess of the bonding metal-silicon eutectic temperature.  
     
     
         4 . A mirror according to  claim 3 , in which said bonding metal is gold.  
     
     
         5 . A mirror according to  claim 3 , in which said bonding metal is aluminum.