“…High power lasers in the 1.3 lm spectral region are of great interest in the fields of medical applications and fiber optics, their advantages are not only low loss and dispersion in the quartz fiber, but also good absorption of water molecules and very good capability of blood hemostasis [1,2]. On the other hand, the frequency doubling of a 1.3 lm laser is also an attractive alternative for generating a red light or pumping tunable lasers such as Cr:LiSAF [3].…”