Photonics Research, 2017, 5 (5): 05000406, Published Online: Aug. 15, 2017   

Q-switching of waveguide lasers based on graphene/WS2 van der Waals heterostructure Download: 1003次

Author Affiliations
1 School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
2 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 Laser Microprocessing Group, Facultad Ciencias, Universidad de Salamanca, Salamanca 37008, Spain
4 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Abstract
We report on the operation of passively Q-switched waveguide lasers at 1 μm wavelength based on a graphene/WS2 heterostructure as a saturable absorber (SA). The gain medium is a crystalline Nd:YVO4 cladding waveguide produced by femtosecond laser writing. The nanosecond waveguide laser operation at 1064 nm has been realized with the maximum average output power of 275 mW and slope efficiency of 37%. In comparison with the systems based on single WS2 or graphene SA, the lasing Q-switched by a graphene/WS2 heterostructure SA possesses advantages of a higher pulse energy and enhanced slope efficiency, indicating the promising applications of van der Waals heterostructures for ultrafast photonic devices.

Ziqi Li, Chen Cheng, Ningning Dong, Carolina Romero, Qingming Lu, Jun Wang, Javier Rodríguez Vázquez de Aldana, Yang Tan, Feng Chen. Q-switching of waveguide lasers based on graphene/WS2 van der Waals heterostructure[J]. Photonics Research, 2017, 5(5): 05000406.

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