From the Editorial Board

Abstract

A fiber-bulk hybrid Er:YAG laser with the 1617 nm single frequency (SF) laser output is reported. The pump source was a 1532 nm Er,Yb fiber laser. Two intra-cavity etalons were used to obtain the SF operation at 1617 nm. Up to 640 mW SF output at 1617 nm was obtained, with a slope efficiency of 36.02%. 1532 nm fiber laser Fiber L1 L2 Input mirror Uncoated etalon Er:YAG Coated etalon Output coupler 1617 nm output