An improved transmitting multi-layer thin-film filter

Zhang Ying^a),^b), Qi Hong-Ji^a), Yi Kui^a), Wang Yan-Zhi^a), Sui Zhan^c), Shao Jian-Da^a)†

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°).