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) LP01 mode power without (dashed line) and with (solid line) thermal disturbance; (b) LP11 mode power without (dashed line) and with (solid line) thermal disturbance.