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High-power QCW microsecond-pulse solid-state sodium beacon laser with spiking suppression and D-2b re-pumping

Author:
Bian, Qi  Bo, Yong  Zuo, Jun-wei  Guo, Chuan  Xu, Chang  Tu, Wei  Shen, Yu  Zong, Nan  Yuan, Lei  Gao, Hong-wei  Peng, Qin-jun  Chen, Hong-bin  Feng, Lu  Jin, Kai  Wei, Kai  Cui, Da-fu  Xue, Sui-jian  Zhang, Yu-dong  Xu, Zu-yan  


Journal:
OPTICS LETTERS


Issue Date:
2016


Abstract(summary):

A 65 W quasi-continuous-wave microsecond-pulse solid-state sodium beacon laser tuned to the sodium D-2a line has been developed with a linewidth of 0.3 GHz, beam quality of M-2 = 1.38, and pulse width of 120 mu s 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 +/- 0.15 GHz through feedback controlling. The laser spiking due to relaxation oscillations is suppressed by inserting frequency doublers in both 1319 and 1064 nm oscillators. Sodium D-2b re-pumping is accomplished by tuning the frequency of the electro-optic modulator with the right D-2a -D-2b offset. A bright sodium laser guide star with a photon return of 1820 photons/cm(2)/s 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. (C) 2016 Optical Society of America


Page:
1732---1735


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