Fiber core mode leakage induced by refractive index variation in high-power fiber laser
Yan Ping, Wang Xuejiao, Huang Yusheng, Fu Chen, Sun Junyi, Xiao Qirong, Li Dan †, Gong Mali
       

(color online) (a) Variation of LP01 core mode coupling coefficient to specifically numbered cladding modes with the wavelength; (b) variation of LP11 core mode coupling coefficient to specifically numbered cladding modes with the wavelength.