Scaling of Yb-doped photonic crystal fiber to 200 μm core diameter for high beam quality laser output
Kuo Meng, Zhu Lian-Qing †, Luo Fei
       

Normalized output power densities versus fiber length when the values of loss factor α (m−1) fluctuate near at the gain saturation point , where the dash line denotes the balanced level of .