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: YVO₄ crystal(corresponding to the ⁴F_3/2-⁴I_13/2 transition) and 1 112 nm from Nd: YAG crystal(corresponding to the ⁴F_3/2-⁴I_11/2 transition) 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 mW at 608.1 nm is obtained at the incident pump power of 740 mW for the Nd: YAG crystal and 600 mW 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.