Generation of a 578-nm Yellow Laser by the Use of Sum-Frequency Mixing in a Branched Cavity

A compact, continuous-wave, solid-state laser at 578 nm has been demonstrated, for the first time to our knowledge, by use of intracavity sum-frequency mixing from a branched cavity with an LBO crystal. Two gain mediums, namely, the Nd:YAG single crystal and the Yb:YAG single crystal (with a disk laser setup), are used to generate the two fundamental 1319- and 1030-nm waves, respectively. The maximum output power of 37.5 mW is obtained at a total pump power of 14 W. The power stability value of the output laser is better than 4.3% in 30 min.