On-Sky Tests of a High-Power Pulsed Laser for Sodium Laser Guide Star Adaptive Optics
On-Sky Tests of a High-Power Pulsed Laser for Sodium Laser Guide Star Adaptive Optics
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DOI：
10.1142/s225117171650001x
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发表时间：
2016-05
影响因子：
3.5
通讯作者：
A. Otarola;P. Hickson;R. Gagné;Y. Bo;J. Zuo;Shi-yong Xie;Lu Feng;S. Rochester;D. Budker;S. Shen;S. Xue;Lingwei Min;K. Wei;C. Boyer;B. Ellerbroek;Jing-yao Hu;Qin-jun Peng;Zu-Yan Xu
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作者：
A. Otarola;P. Hickson;R. Gagné;Y. Bo;J. Zuo;Shi-yong Xie;Lu Feng;S. Rochester;D. Budker;S. Shen;S. Xue;Lingwei Min;K. Wei;C. Boyer;B. Ellerbroek;Jing-yao Hu;Qin-jun Peng;Zu-Yan Xu
我们展示了2013年夏天进行的空中测试结果，以表征用于自适应光学的原型高功率脉冲激光器的性能。激光器以600-800Hz的脉冲重复率（PRR）工作，占空比为6%。在最佳测试条件下（发射功率为18W），圆极化时耦合效率为231±14个光子s−1 sr−1原子−1 W−1 m2，线极化时耦合效率为167±17个光子s−1 sr−1原子−1 W−1 m2。当使用D2b泵浦时，没有看到任何改善，但这可能是由于相对较大的激光导星（LGS）直径，通常为10角秒或更多，导致低辐照水平。激光输出中存在强的弛豫振荡，使耦合效率降低。为了更好地理解结果，使用测量到的脉冲剖面和特定于这些测试的参数进行了物理建模。模型结果表明，对于一个角大小为10弧秒的LGS点，agr…
We present results of on-sky tests performed in the summer of 2013 to characterize the performance of a prototype high-power pulsed laser for adaptive optics. The laser operates at a pulse repetition rate (PRR) of 600–800Hz, with a 6% duty cycle. Its coupling efficiency was found to be, in the best test case (using 18W of transmitted power), 231±14 photons s−1 sr−1 atom−1 W−1 m2 when circular polarization was employed and 167±17 photons s−1 sr−1 atom−1 W−1 m2 with linear polarization. No improvement was seen when D2b repumping was used, but this is likely due to the relatively large laser guide star (LGS) diameter, typically 10 arcsec or more, which resulted in low irradiance levels. Strong relaxation oscillations were present in the laser output, which have the effect of reducing the coupling efficiency. To better understand the results, a physical modeling was performed using the measured pulse profiles and parameters specific to these tests. The model results, for a 10 arcsec angular size LGS spot, agr...