In this paper, molybdenum diselenide (MoSe2) was fabricated by chemical vapor deposition (CVD) with a modulation depth of about 7.3% and nonsaturable loss of about 30.6%. Bright-dark soliton pairs have been obtained in a thulium-holmium-doped fiber ring laser based on MoSe2 as a saturable absorber (SA) for the first time, to the best of our knowledge. The results not only prove that MoSe2 can be used as an excellent saturable absorber in the field of ultra-fast optics, but also provide a certain reference value for the future research on bright-dark soliton pairs based on two-dimensional materials. INDEX TERMS molybdenum diselenide, bright-dark soliton pairs, mode-locked fiber laser. XIAOFA WANG received the Ph.D. degree from the School of Optoelectronic Engineering, Chinese Academy of Sciences, Beijing, China, in 2012. He is currently an Associate Professor with Chongqing University of Posts and Telecommunications, Chongqing, China. He has authored or coauthored more than 20 journal articles. His current research interests include fiber lasers, solid-state lasers, and nonlinear optics. He is a member of the Optical Society of America. HUIHUI HAN is currently pursuing the M.S. degree with the School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China. Her research interests include fiber lasers and nonlinear optics. DONGXIN LIU is currently pursuing the M.S. degree with Chongqing University of Posts and Telecommunications, Chongqing, China. His research direction is ultrafast fiber lasers.
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