中国激光, 2020, 47(8): 0801001, 网络出版: 2020-08-01

基于多种激光参数泵浦的钠导星回光强度研究

Return Intensity of Sodium Guide Star Based on Pumping Under Multiple Laser Parameters
作者单位

1中国工程物理研究院应用电子学研究所, 四川 绵阳 621999

2中国工程物理研究院高能激光科学与技术重点实验室, 四川 绵阳 621999

3中国科学院光电技术研究所, 四川 成都 610209

摘要
高亮度的钠导星是实现大气波前畸变精准探测的重要条件。已有研究表明,钠导星的后向共振荧光散射强度与大气传输效率、地磁场、季节、发射系统参数、接收系统参数和泵浦激光参数等诸多因素密切相关。脉冲型钠导星可有效提高自适应光学系统的波前探测信噪比。在多种激光参数泵浦模式下,开展了脉冲型钠导星回光强度的探测实验。基于高能量多纵模百微秒脉冲钠导星激光泵浦大气钠层,获取了一系列回光强度数据,与理论分析结果比较吻合。实验结果表明:泵浦激光谱线的精密控制是获得钠导星稳定回光强度的重要手段,基于圆偏振光双线展宽泵浦体制的钠导星工作模式是实现高效激发钠层原子并获得高亮度回光的有效途径。
Abstract
Sodium guide stars with high brightness are an important condition for accurate detection of atmospheric wavefront distortion. Studies have shown that the intensity of backward resonance fluorescence scattering of a sodium guide star is closely related to many factors such as atmospheric transmission efficiency, geomagnetic field, seasons, emission system parameters, receiving system parameters and pumping laser parameters. Pulsed sodium guide stars can effectively improve the signal-to-noise ratio of wavefront detection in adaptive optical systems. The return light intensity detection experiment for a pulsed sodium guide star is carried out based on pumping modes under various laser parameters. Based on the high-energy, multi-longitudinal mode, and hundred-microsecond pulsed sodium guide star laser pumped sodium layer in the atmosphere, a series of return light intensity data are obtained, which are in good agreement with the theoretical analysis results. The experimental results show that the precise control of the pumping spectral line is an important means to obtain the stable return light intensity of the sodium guide star, and the working mode of the sodium guide star based on the circularly polarized light pumping and double-line broadening pumping system is an effective way to efficiently excite the sodium layer atoms and obtain high brightness return light.
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