The modal of 18-core photonic crystal fiber laser is discussed and calculated.And corresponding far-field distribution of the supermodes is given by Fresnel diffraction integral.For improving beam quality,the mode sel...The modal of 18-core photonic crystal fiber laser is discussed and calculated.And corresponding far-field distribution of the supermodes is given by Fresnel diffraction integral.For improving beam quality,the mode selection method based on the Talbot effect is introduced.The reflection coefficients are calculated,and the result shows that an in-phase supermode can be locked better at a large propagation distance.展开更多
Based on the Helmholtz equations, the full-vector finite element method (FEM) accompanied with the shifted iteration algorithm is used to analyze in-phase supermodes of a 19-core photonic crystal fiber. The effects of...Based on the Helmholtz equations, the full-vector finite element method (FEM) accompanied with the shifted iteration algorithm is used to analyze in-phase supermodes of a 19-core photonic crystal fiber. The effects of fiber structural parameters on the in-phase supermode field are also studied. The results indicate that the form of the fiber structure plays a key role on coupling of fiber cores, and the desired mode shapes which have the same amplitude in each core can be obtained by choosing the appropriate diameter of airhole. The results show a viable option for further achieving high-power laser output.展开更多
基金supported by the National Basic Research Program of China(No.2010CB327801)the Key Program of National Natural Science Foundation of China(No.60637010)
文摘The modal of 18-core photonic crystal fiber laser is discussed and calculated.And corresponding far-field distribution of the supermodes is given by Fresnel diffraction integral.For improving beam quality,the mode selection method based on the Talbot effect is introduced.The reflection coefficients are calculated,and the result shows that an in-phase supermode can be locked better at a large propagation distance.
基金supported by the National Natural Science Foundation of China (Nos. 10676023, 60890203 and 10976017)
文摘Based on the Helmholtz equations, the full-vector finite element method (FEM) accompanied with the shifted iteration algorithm is used to analyze in-phase supermodes of a 19-core photonic crystal fiber. The effects of fiber structural parameters on the in-phase supermode field are also studied. The results indicate that the form of the fiber structure plays a key role on coupling of fiber cores, and the desired mode shapes which have the same amplitude in each core can be obtained by choosing the appropriate diameter of airhole. The results show a viable option for further achieving high-power laser output.
