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产生钠导引星星群的钠信标激光合/分束技术

卞奇 薄勇 左军卫 彭钦军

卞奇, 薄勇, 左军卫, 等. 产生钠导引星星群的钠信标激光合/分束技术[J]. 强激光与粒子束, 2023, 35: 041011. doi: 10.11884/HPLPB202335.220317
引用本文: 卞奇, 薄勇, 左军卫, 等. 产生钠导引星星群的钠信标激光合/分束技术[J]. 强激光与粒子束, 2023, 35: 041011. doi: 10.11884/HPLPB202335.220317
Bian Qi, Bo Yong, Zuo Junwei, et al. Beam combining/splitting technology of sodium beacon laser for generating sodium guidestars constellation[J]. High Power Laser and Particle Beams, 2023, 35: 041011. doi: 10.11884/HPLPB202335.220317
Citation: Bian Qi, Bo Yong, Zuo Junwei, et al. Beam combining/splitting technology of sodium beacon laser for generating sodium guidestars constellation[J]. High Power Laser and Particle Beams, 2023, 35: 041011. doi: 10.11884/HPLPB202335.220317

产生钠导引星星群的钠信标激光合/分束技术

doi: 10.11884/HPLPB202335.220317
基金项目: 国家自然科学基金项目(62005295);国家重点研发计划项目(2016YFB0402103)
详细信息
    作者简介:

    卞 奇,bianqi@mail.ipc.ac.cn

    通讯作者:

    薄 勇,boyong@mail.ipc.ac.cn

  • 中图分类号: O437

Beam combining/splitting technology of sodium beacon laser for generating sodium guidestars constellation

  • 摘要: 研究了脉冲光束的偏振和时序非相干合成技术,通过偏振合束器将两路50 W级500 Hz的589 nm钠信标激光在空间上合为一束光线,成功突破了100 W级μs脉冲全固态钠信标激光输出;利用脉冲激光同步延时器控制两路激光脉冲的时序,使其按先后顺序合成一束脉冲激光,重复频率提升到1 kHz。合束后的激光光束质量M2约为1.41,与单光束的光束质量基本保持一致,光斑抖动性约为40 μrad,可满足激光钠导引星自适应光学系统的应用需求。与传统的相干合成方法相比,该偏振和时序非相干合成方案具有结构简单、稳定、效率高的优点,且整个系统无需复杂的相位控制机制,为脉冲激光功率扩展提供了新途径。基于上述技术基础,结合自主提出的精密偏振分光专利技术,在丽江天文台通过一台发射望远镜将四束25 W/束的µs脉冲黄激光发射到钠层,成功产生了四颗钠导引星,这一结果将有助于推动大型地基光学望远镜中多层共轭自适应光学技术的发展。
  • 图  1  两路脉冲钠信标激光非相干合成与偏振分束技术方案示意图

    Figure  1.  Schematic of incoherent beam combining and polarization splitting for two pulsed sodium lasers. BC, beam collimator; HW, half-wave plate; HR: high reflective mirror; PC: polarization coupler; EOM: electro-optical modulator; BS: beam splitter; PS: polarization splitter

    图  2  偏振时序控制的脉冲时间序列示意图

    Figure  2.  Schematic of two pulsed laser beams by polarization and sequence combining

    图  3  合成钠信标激光功率30 min稳定性测试

    Figure  3.  Power-stability test of the combined sodium laser at the highest output over 30 min

    图  4  合成钠信标激光脉冲序列图

    Figure  4.  Pulse train of the combined sodium laser observed by an oscilloscope

    图  5  钠信标激光光斑的二维强度分布图

    Figure  5.  Two-dimensional spatial intensity profiles of sodium beacon laser beam

    图  6  合成钠信标激光束的指向稳定性测试

    Figure  6.  Pointing measurement of the combined laser beam

    图  7  钠信标激光器外场试验产生钠导引星图

    Figure  7.  Images of generating guide stars for sodium beacon laser on-sky tests

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  • 被引次数: 0
出版历程
  • 收稿日期:  2022-09-25
  • 修回日期:  2022-12-01
  • 录用日期:  2022-12-12
  • 网络出版日期:  2022-12-13
  • 刊出日期:  2023-03-30

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