Design analysis on 1 319 nm Nd:YAG three-longitudinal-mode pulse laser

The strongest transition of the Nd:YAG occurs at 1 064 nm, which exhibits a fluorescence linewidth of 4～6 cm-1, the Nd:YAG laser shows multiple longitudinal-mode operation at 1 064 nm usually. In order to obtain the laser emission at 1 319 nm, key mirror coatings are designed, which suppress the unwanted oscillations in the cavity. The properties of wavelength tuning and longitudinal-mode-selecting of Fabry-Perot etalon are discussed. The output wavelength is tuned by adjusting the tilt angle of etalon and three adjacent longitudinal modes are obtained with two etalons. The 1 319 nm laser's requirements could be satisfied.