| 摘要 |
The invention relates to very high quality mirrors, especially those for which extreme dimensional stability is required (optical systems for X-rays) or those which are to reflect high-power light beams, that is to say having to withstand thermal shocks and/or work at very high temperature. The novelty resides in the material of the substrate of the mirror - a grade of graphite - which combines the advantages of light weight, good thermal conductivity, low coefficient of expansion and remarkable dimensionable stability; it is known how to deposit, onto this graphite, perfectly adhering layers of various metals (rhenium, rhodium, molybdenum, tungsten, etc.); these deposited metals, very pure and free of cavities, enable optically perfect surfaces to be produced. The method for finishing the surface of these mirrors is electrolytic machining using electrolysis-current jets and scanning speed which are controlled (slaved), which enables aspherical surfaces to be produced quite easily. <IMAGE>
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