New method for side pumping of double-clad fiber lasers using planar grating written into the inner cladding
Xingchun Chu, Shanghong Zhao, Zhouliang Wu, Lei Shi, Shengbao Zhan, Yunxia Li, and Lihua Ma
Proc. SPIE Vol. 7382, 73820X (Aug. 28, 2009)