Diode-pumped all-solid-state sum-frequency mixing laser at 608. 1 nm

A compact all-solid-state intracavity sum-frequency mixing laser at 608. 1 nm is reported. A Nd∶YAG crystal and a Nd∶ YVO4 crystal are pumped by two laser diodes respectively in two sub-arms of the laser cavity. In the two arms,laser wavelengths of 1 342 nm from Nd∶ YVO4crystal( corresponding to the4F3 /2-4I13 /2transition) and 1 112 nm from Nd∶ YAG crystal( corresponding to the4F3 /2-4I11 /2transition) are selected to be mixed into 608. 1 nm laser. Through optimization of the cavity design,better matching of the modes for the two wavelengths is obtained. In the overlapping of the two arms,sum-frequency mixing is generated with a type I phase-matching LBO crystal. The experiment result shows that a stable and low noisy output of 23. 8 m W at608. 1 nm is obtained at the incident pump power of 740 m W for the Nd∶ YAG crystal and 600 m W for the Nd∶ YVO4 crystal. It is an efficient way to obtain 608. 1 nm laser with the sum-frequency mixing structure proposed in this article.