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12
Issue
vol 60 / DECEMBER, 2017
Article

DOI 10.17586/0021-3454-2017-60-12-1177-1183

UDC 004.627

THE CONDITION FOR OBTAINING A CONSTANT REFLECTION COEFFICIENT FROM SPHERICAL SURFACES OF GREAT CURVATURE

H. L. Thang
ITMO University, Saint Petersburg, 197101, Russian Federation; student


L. A. Gubanova
ITMO University, 197101, Saint-Petersburg, Russian federation; Professor


V. B. Nguyen
ITMO University, Department of Optical Information Technologies and Materials; Post-Graduate Student


Abstract. A method is proposed to increase the size of enlightenment area defined as the ratio of the radius for the optical element surface, where the reflection is less than a certain value, to the element radius. The increase is achieved due to the use of a circular diaphragm, located between the evaporator and the substrate, which shields a part of the evaporated molecular flow and redistributes it over a specified por-tion on surface of the optical element. It is shown that the size of the enlightenment area increases by 17% when a single-layer antireflection coating with refractive index ni = 1,35 is formed on the surface of large-curvature optical element (radius R = 10 mm) made of a material with the refractive index nm = 1,52. Analysis of factors influencing the size of the enlightenment area is carried out for the case when a circular diaphragm is used, and distribution of the reflection coefficient of single-layer antireflection coating over the surface of large-curvature optical element is demonstrated. 
Keywords: anti-reflective coating, area of enlightenment, large-curvature optical detail, diaphragm

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