[5] Song Yanfeng, Shao Xiaopeng, Xu Jun. Design of a hybrid infrared apochromatic optical system beyond normal temperature[J]. Acta Physica Sinica, 2008, 57(10): 6298~6303
[7] Y. Tamagawa, T. Tajime. Expansion of an athermal chart into a multilens system with thick lenses spaced apart [J]. Opt. Engng., 1996, 35(10): 3001~3006