DOUBLE CLAD HIGH BRIGHTNESS Nd FIBER LASER PUMPED BY GaAlAs PHASED ARRAY

We report on the most recent improved version of the double clad configuration for efficient pumping of a single mode fiber laser with a multi-mode pump1 In the earlier report, the first and second claddings were substantially fused slica and the core containing Nd was offset from the center of the fiber axis, as shown in Fig. (1,a).