Tunable linewidth control technique for solid-state laser based on Fabry-Perot etalon

Sodium guide-star laser research needs laser linewidth tunable within a range. The numerical simulation of linewidth compressing by Fabry-Perot etalon has been done, using an all-solid-state 1064 nm laser with high beam quality and linear polarization output as the experiment device, the spectrum of laser is test and put into the calculation. Linewidth discrete tuning in the range of 0.75-2.83 GHz is achieved by inserting different single etalons and combinations of etalons selected by the simulation results in the cavity. Without temperature control of etalon, the central wavelength of laser is fixed to 1 064.58 nm in linewidth tuning, and the wavelength excursion is less than 3 pm in 30 minutes.