Physics – Optics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pnaoc...4...59l&link_type=abstract
Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 4, No.
Physics
Optics
Thin Film Optics, Antireflection Coatings, Vacuum Window, Solar Telescope
Scientific paper
The Yunnan 1m Solar Telescope (YNST) is a vacuum telescope. It uses four flat vacuum windows to seal off the vacuum. The entire light transmittance will be reduced by the vacuum windows, and a part of the reflected light will change into the scattered or stray light. In this paper the influence of the vacuum window is analyzed. Based on the suggestion of the YNST Science Case Group, an optimum technique has been used to determine the layer thickness for a coating design. The coating will include minimal layers to maximize the energy throughput of the system on the key wave, and minimize the scattered or stray energy. In this way, the antireflection coating over a wide wavelength interval can easily be gotten, and the ratio of utilizing of the optical energy can be increased.
Liu Zhong
Lun Bao-Li
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