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基于离轴自由曲面的激光通信光学天线设计

谷茜茜 崔占刚 亓波

谷茜茜, 崔占刚, 亓波. 基于离轴自由曲面的激光通信光学天线设计[J]. 中国光学, 2020, 13(3): 547-557. doi: 10.3788/CO.2019-0157
引用本文: 谷茜茜, 崔占刚, 亓波. 基于离轴自由曲面的激光通信光学天线设计[J]. 中国光学, 2020, 13(3): 547-557. doi: 10.3788/CO.2019-0157
GU Xi-xi, CUI Zhan-gang, QI Bo. Design of optical antenna for laser communication based on an off-axis freeform surface[J]. Chinese Optics, 2020, 13(3): 547-557. doi: 10.3788/CO.2019-0157
Citation: GU Xi-xi, CUI Zhan-gang, QI Bo. Design of optical antenna for laser communication based on an off-axis freeform surface[J]. Chinese Optics, 2020, 13(3): 547-557. doi: 10.3788/CO.2019-0157

基于离轴自由曲面的激光通信光学天线设计

doi: 10.3788/CO.2019-0157
基金项目: 中国科学院创新基金(No. CXJJ-19S008)
详细信息
    作者简介:

    谷茜茜(1993—),女,河北石家庄人,硕士研究生,2017年于长春理工大学获得学士学位,主要从事激光通信光学系统设计方面的研究。E-mail:gu_xi_xi@126.com

    亓波:亓 波(1978—),男,山东莱芜人,博士,研究员,博士生导师,主要从事光学工程,光学精密机械等方面的研究。E-mail:qibo@ioe.ac.cn

  • 中图分类号: TP394.1;TH691.9

Design of optical antenna for laser communication based on an off-axis freeform surface

Funds: Supported by CAS Innovation Project of China (No. CXJJ-19S008)
More Information
  • 摘要: 为了提高空间激光通信系统的工作范围,简化光学系统的结构,提出了基于离轴自由曲面的大视场两镜无焦光学天线的设计形式。该光学天线采用无焦结构,无需再使用准直透镜元件,可以极大地简化系统结构,克服了传统聚焦光学天线体积过大、大功率光源情况下焦点处功率密度过高等问题。首先,基于三级像差理论,推导了两镜无焦系统的消像差公式,并对求解结果进行了分析总结。然后,根据求解结果和实际需求设计了一款无焦光学天线,该系统的有效通光口径为100 mm,放大倍率为5倍,波段为500~1 100 nm,全视场角为0.6°,主镜为凹抛物面的一部分,次镜采用XY多项式表征的自由曲面,并用MATLAB 对次镜自由曲面面形进行了仿真。结果表明,光学系统全视场的波像差优于λ/14(λ=500 nm),斯托列尔比大于0.8,系统能量集中度较高,像质接近衍射极限,光学视场相对于传统二次曲面系统增加了26.7%。因此,该种天线结构在激光通信领域具有较强的实用性和很好的发展前景。
  • 图  1  离轴两镜无焦系统的两种结构

    Figure  1.  Structures of two kinds of off-axis two-mirror afocalsystems

    图  2  同轴两镜无焦系统示意图

    Figure  2.  Schematic of coaxial two-mirror afocal system

    图  3  离轴量示意图

    Figure  3.  Schematic of off-axis distance

    图  4  视场采样图

    Figure  4.  Field sampling map

    图  5  光学系统结构图

    Figure  5.  Layout of the optical system

    图  6  次镜XY自由曲面的二维和三维面形图

    Figure  6.  2-D and 3-D profiles of XY freeform surface for secondary mirror

    图  7  次镜的面形梯度

    Figure  7.  Surface gradient of secondary mirror

    图  8  光学系统的RMS波像差

    Figure  8.  RMS wavefront errors of different optical systems

    图  9  光学系统的斯托列尔比(SR)

    Figure  9.  Strehl Ratios (SR) of different optical systems

    图  10  光学系统点列图

    Figure  10.  Spot diagrams of different optical systems

    图  11  不同光学系统的MTF

    Figure  11.  MTFs of different optical systems

    表  1  次镜自由曲面参数

    Table  1.   Polynomial parameters of freeform surface for secondary mirror

    ItemCoefficient AiItemCoefficient Ai
    X1Y00X3Y10
    X0Y16.735 780×10–5X2Y26.216 308×10–9
    X2Y00X1Y30
    X1Y10X0Y41.616 430×10–9
    X0Y20X5Y00
    X3Y00X4Y1−2.079 343×10–11
    X2Y1−1.055 768×10–7X3Y20
    X1Y20X2Y3−1.129 752×10–10
    X0Y3−4.533 126×10–8X1Y40
    X4Y05.532 042×10–11X0Y5−1.957 926×10–11
    下载: 导出CSV
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  • 收稿日期:  2019-07-25
  • 修回日期:  2019-09-15
  • 刊出日期:  2020-06-01

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