Fabrication of sapphire optical windows with infrared transmittance enhancement and visible transmittance reduction by femtosecond laser direct writing

Zhen Yue, Lu He, Qiannan Cui, Wenhai Gao, Yuchen Yin, Lingyi Meng, Cong Chen, Yang Liao, Yuxin Leng, Zewen Wang, Yushi Chen, Xiaodong Wang