65-mW, 3.4-μm tunable difference frequency generation source using damage resistant Zn:LiNbO3 waveguide

In this paper, we report high-power 3.4-μm DFG in a damage resistant Zn:LiNbO
₃
waveguide fabricated with direct bonding technology. Using a CW high-power fiber amplifier (FA) as the pump source, we obtained a mid-IR output of as high as 65 mW, which is the highest mid-IR output from a waveguide device yet reported.