| 大气湍流下超振荡望远成像的理论研究 |
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| 引用本文： | 周健文,姚纳,赵汗青,张云凡,焦蛟,孙旭,伍波.大气湍流下超振荡望远成像的理论研究[J].激光技术,2023,47(1):115-120. |
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| 作者姓名： | 周健文 姚纳 赵汗青 张云凡 焦蛟 孙旭 伍波 |
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| 作者单位： | 1.成都信息工程大学 光电工程学院, 成都 610225 |
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| 摘 要： | 为了实现大气湍流动态干扰下望远镜对远距离目标的超衍射极限成像, 采用光学超振荡原理局部衍射压缩光学系统点扩散函数, 并对提高成像分辨率效果进行了理论研究。结果表明, 中等湍流强度校正后, 波前残差均方根约为波长的1/15(波长λ=632.8 nm)时的干扰下, 超振荡光场调制能够实现望远系统点扩散函数的衍射压缩, 衍射压缩倍率为0.75;对不同中心间距双孔的成像研究验证了超振荡望远系统约0.80倍瑞利衍射极限的超分辨成像效果; 波前残差的均方根大小可能会导致望远系统点扩散函数的衍射压缩倍率和成像分辨率存在差异。此研究结果可应用于高精度星点定位、超分辨望远等领域。
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| 关 键 词： | 傅里叶光学 望远镜 超振荡 大气湍流 |
| 收稿时间： | 2021-01-26 |
Theoretical study of super-oscillation telescope imaging with atmospheric turbulence |
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| Abstract: | In order to achieve sub-diffraction limited imaging of the distant objects with telescope under the dynamical disturbance of the atmospheric turbulence, the optical super-oscillation phenomenon was utilized to locally compress the point spread function of the telescope. Theoretical study was performed to investigate the imaging resolution improvement with super-oscillation phenomenon. In the case of the modest atmospheric turbulence, the adaptive optics closed-loop root mean square of the simulated residual wave front error is about 1/15 of wavelength. The numerical full width at half maxima of the super-oscillation spot is about 0.75 times of the Airy spot at the working wavelength of 632.8 nm. In addition, the imaging results of the two holes with different center-to-center distances validate that the resolving ability of the super-oscillation telescope is about 0.80 times of the Rayleigh criterion. Different root mean square of the residual wave front error would result in the diffractive compression ratio of the telescope's point spread function and the improvement of the imaging resolution. It is believed that this study provides a practical method for the high-precision star positioning and the super-resolution telescope etc. |
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