MXene Ti <sub>3</sub> C <sub>2</sub> T <sub>x</sub> saturable absorber for passively Q‐switched mid‐infrared laser operation of femtosecond‐laser–inscribed Er:Y <sub>2</sub> O <sub>3</sub> ceramic channel waveguideQingyu Tian, Xiaodong Xu, Teng Zhang et al.|Nanophotonics|2020Cited by 41