An improved transmitting multi-layer thin-film filter
Zhang Yinga),b), Qi Hong-Jia), Yi Kuia), Wang Yan-Zhia), Sui Zhanc), Shao Jian-Daa)†
       
Angular resolutions of designed transmitting ultra-narrow bandpass filters with different period numbers ( n = 4, 6, 9, 12) at oblique angles of incidence (30°, 45°, and 60°).