Development of optics for future EUV astronomy

我已经制造了两个多层膜反射镜。一个具有一对40个Y2 O3/Al层，另一个具有一对20个Mg/SiC层。结果表明：（1）Mg/SiC反射镜的反射率比Mo/Si反射镜高一倍左右，但（2）在大气环境下反射率降低;（3）Y_2O_3/Al多层膜反射镜在30.4nm处的反射率比Mo/Si反射镜高，而在58.4nm处的反射率比Mo/Si反射镜低五分之一。Y_2O_3/Al多层膜在不久的将来有足够的能力用于星载仪器。

I have manufactured two multilayer mirrors. One has a pair of 40 Y２O３/Al layers and the other has a pair of 20 Mg/SiC layers. I concluded that (1) An Mg/SiC mirror has about twice higher reflectivity than that of Mo/Si, but (2) it decreases the performance under the atmosphere, (3) a Y2O3/Al multilayer mirror has higher reflectivity at 30.4nm than that of Mo/Si, furthermore (4) it can reduce the reflectivity at 58.4nm to one-fifth in comparison with Mo/Si pairs. The Y2O3/Al multilayer has enough capability to use space-borne instrument in the near-future.