LIU Ying, LI Fu-tian . MgF<SUB>2</SUB>-overcoated aluminium films for ultraviolet and vacuum ultraviolet[J]. Editorial Office of Optics and Precision Engineering, 2001,(2): 165-168
LIU Ying, LI Fu-tian . MgF<SUB>2</SUB>-overcoated aluminium films for ultraviolet and vacuum ultraviolet[J]. Editorial Office of Optics and Precision Engineering, 2001,(2): 165-168DOI:
-overcoated aluminium films are often used in the spectral range of vacuum ultraviolet. According to the theory of electromagnetism
reflectance of Al+MgF
2
at normal incident was calculated in the way of matrix optics where the optical constant of MgF
2
was taken as a complex number. The effect of thickness of MgF
2
on the reflectance of Al+MgF
2
coatings was considered. The MgF
2
not only prevents the aluminum from being oxidized
but also increases the reflectance of Al+MgF
2
by interference. The reflectance of Al+MgF
2
at incident angle of 10°from 150nm~340nm is above 80% which was measured by Seya-Namioka UV-VUV reflectometer. The reflectance of Al+MgF
2
does not change distinctly after the aging of one year or keeping at the temperature of 55℃ for 12 h. The paper also discusses the preparation of Al+MgF
2
films.
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references
Hass G, Hunter W R, Tousey R. Reflectance of evaporated aluminium in the vacuum ultraviolate[J]. J.Opt. Soc. Am., 1956, 46(12): 1009-1012.
Samson James A R. Techniques of vacuum ultraviolet spectroscopy[M]. New York:John Wiley & Sons, Inc., 1967.
严瑛白. 应用物理光学[M].北京:机械工业出版社, 1990.
Steans D G. The scattering of X-rays from nonideal multilayer structures[J]. J. Appl. Phys,1989,65(2): 491-506.