Abstract
A 65 W quasi-continuous-wave microsecond-pulse solid-state sodium beacon laser tuned to the sodium line has been developed with a linewidth of 0.3 GHz, beam quality of , and pulse width of 120 μs at a repetition rate of 500 Hz by sum-frequency mixing 1319 and 1064 nm diode-pumped Nd:YAG master-oscillator power-amplifier systems. The laser wavelength stability is less than through feedback controlling. The laser spiking due to relaxation oscillations is suppressed by inserting frequency doublers in both 1319 and 1064 nm oscillators. Sodium re-pumping is accomplished by tuning the frequency of the electro-optic modulator with the right offset. A bright sodium laser guide star with a photon return of was achieved with the laser system when a 32 W circular polarized beam was projected to the sky during our field test at the Xinglong Observatory.
© 2016 Optical Society of America
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