Akie ICHIKAWA
(Ehime University)
Hyper Suprime-Cam is a new prime focus camera of Subaru telescope, and is characterized by wide field-of-view, 1.5 degree in diameter. However, because filters must be huge, 60 cm in diameter, it is seriously difficult to produce them. We had developed a skill of multi-layer coatings with a company Optical Coatings Japan, and manufactured a narrow band filter NB718. In order to confirm its optical property, we have measured its transmittance curves at 69 points. The obtained data indicate that peak transmittance, FWHM, FW10M, FW80M, center wavelength, and center wavelength change rate fulfill our requirements, and thus, the fabrication of NB718 is succeeded.