Beijing University of Posts and Telecommunications, China

Biography: Wenjun Liu is an associate professor and doctoral supervisor of Beijing University of Posts and Telecommunications. He is mainly engaged in research work on fiber micro-structure and basic theory of fiber nonlinearity in ultrashort pulse fiber lasers. So far, more than 150 SCI papers have been published in academic journals such as Nanoscale, Optics Letters, Photonics Research, Physical Review A, Optics Express, etc., which have been cited by SCI more than 2,000 times.

Speech Title: Two-dimensional Nanomaterial Fiber Laser

Abstract: Ultra-short pulse fiber laser has the characteristics of easy operation, compact structure, stable performance and low cost. It is widely used in the high-speed optical communication and optical sensing, and is one of the research hotspots in the field of optoelectronics. At present, ultra-short pulse fiber lasers have to rely more on the saturable absorber to achieve stable mode-locking operation. However, the laser damage and loss caused by the saturable absorber not only restrict the pulse width and power, but also affect the reliability of long-term operation. Therefore, the research and development of new saturable absorbers with high damage threshold and low loss and their application in fiber lasers, have drawn much attention from laser and material experts. Based on the designability and controllability of the structure of the saturable absorber, this study will design and prepare the composite structure of the saturable absorber with different two-dimensional nanomaterials and different substrates. By designing different cavity types of fiber laser and adopting different mode-locking principles, ultra-short mode-locking lasers can be obtained.