Design of First-Order 121.6 nm Minus Filters
Design of First-Order 121.6 nm Minus Filters
复制标题
DOI：
10.1177/0003702818788828
复制
发表时间：
2018-07
影响因子：
3.5
通讯作者：
Xiaodong Wang;Bo Chen;T. Huo;Hongjun Zhou
中科院分区：
文献类型：
--
作者：
Xiaodong Wang;Bo Chen;T. Huo;Hongjun Zhou
利用麦克劳德软件中的等效参数函数可以计算多层膜的等效导纳和相厚度，即使当材料同时具有吸收性和色散性，入射角不为零时也可以计算。利用该软件设计了基于三氟化镧（LaF 3）/氟化镁（MgF 2）多层膜的一阶121.6 nm负滤光片，并引入了高斯型目标曲线。得到了带宽分别为10 nm和5 nm的负滤光片，具有较好的可见光抑制和较低的旁瓣波纹。这种设计的滤波器将用于安装在莱曼-阿尔法太阳望远镜中的莱曼-阿尔法日冕仪和成像仪，该望远镜将于2021年由中国发射。
The equivalent parameters function in Macleod software can be used to calculate the equivalent admittance and phase thickness of multilayers, even when the material is both absorbing and dispersive, and the incidence angle is non-zero. We utilized this software to design first-order 121.6 nm minus filters based on a lanthanum trifluoride (LaF3)/magnesium fluoride (MgF2) multilayer; a Gaussian-type target curve was also introduced into the design. Minus filters with bandwidths of 10 and 5 nm were obtained and had good visible light suppression and low side-lobe ripples. This designed filter will be fabricated for use in a Lyman-alpha coronagraph and imager installed in the Lyman-Alpha Solar Telescope, which will be launched by China in 2021.