Author Affiliations
Abstract
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
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.
(230.7370) Waveguides (140.3540) Lasers Q-switched (130.0130) Integrated optics (160.4236) Nanomaterials. Photonics Research
2017, 5(5): 05000406
1 北京理工大学 光电学院, 北京 100081
2 山东大学化学与化工学院, 济南 250100
利用调QNd∶YAG 倍频激光泵浦KTP非线性晶体为介质的参量振荡器, 产生了608.3nm~903.1nm宽带参量调谐激光, 线宽1.4nm, 光-光转换效率30% 。当泵浦光增强到12mJ时, 在参量激光谱线的近傍, 长波方向出现了一条新谱线, 与参量调谐激光谱线同步移动, 谱线间隔随参量激光波长的增加而增加, 两条谱线波数(能量)差(720cm-1)是一个定值, 这是参量激光激发出斯托克斯拉曼激光典型特征。
参量振荡 拉曼散射 斯托克斯散射 OPO Raman scatterer Stokes spectrum
