Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO2 laser Tian, Xin ; Li, Hao ; Liu, Le ; Wang, Meng ; Xi, Xiaoming ; Wang, Zefeng Abstract Publication: Chinese Optics Letters Pub Date: 2019 DOI: 10.3788/COL201917.120602 Bibcode: 2019ChOpL..17l0602T