Fig. 1. Experimental configuration of multiple sodium LGS system (BS, beam shaper; HW, half-wave plate; HR, high reflection mirror; P, thin film polarizer; QWP, quarter-wave plate; PD, photo detector; OC, optical chopper; CCD, charge-coupled device; p, horizontal polarization; s, vertical polarization;L_l/L_r, linearly polarization at a 135°/45° to the x-axis; C_l/C_r, left-hand/right-hand circular polarization)

Fig. 2. Measurement results of average output power of sodium laser

Fig. 3. Measurement results of sodium laser wavelength and linewidth

Fig. 4. Pulse traces measurement of (a) s-polarized laser-1; (b) p-polarized laser-2; (c) Combined laser with alternate s/p polarization

Fig. 5. Photograph of two sodium laser facility on 1.8 m telescope

Fig. 6. Images of sodium LGS asterism and Rayleigh scattering with different configurations

Fig. 7. Spot size of single sodium LGS(Squares: Experimental results; Solid line: Gaussian fitting)

Fig. 8. LGS flux for orthogonally circular and orthogonally linear polarization versus laser power

Fig. 9. Simulated echo of Rayleigh and sodium LGS(Inset: Sodium LGS image without Rayleigh)