湍流大气中激光相干探测回波光强与空间相干特性研究

任建迎; 孙华燕; 赵延仲; 张来线

doi:10.37188/CO.2019-0194

Volume 13 Issue 4

Aug. 2020

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Chinese Optics > 2020 > 13(4): 728-736.

REN Jian-ying, SUN Hua-yan, ZHAO Yan-zhong, ZHANG Lai-xian. Light intensity and spatial coherence characteristics of laser coherent detection in a turbulent atmosphere[J]. Chinese Optics, 2020, 13(4): 728-736. doi: 10.37188/CO.2019-0194

Citation:

REN Jian-ying, SUN Hua-yan, ZHAO Yan-zhong, ZHANG Lai-xian. Light intensity and spatial coherence characteristics of laser coherent detection in a turbulent atmosphere[J]. Chinese Optics, 2020, 13(4): 728-736. doi: 10.37188/CO.2019-0194

Citation:

REN Jian-ying, SUN Hua-yan, ZHAO Yan-zhong, ZHANG Lai-xian. Light intensity and spatial coherence characteristics of laser coherent detection in a turbulent atmosphere[J]. Chinese Optics, 2020, 13(4): 728-736. doi: 10.37188/CO.2019-0194

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Light intensity and spatial coherence characteristics of laser coherent detection in a turbulent atmosphere

doi: 10.37188/CO.2019-0194

1.
Department of Electronic and Optical Engineering, Space Engineering University, Beijing 101416, China
2.
Graduate School, Space Engineering University, Beijing 101416, China

Funds: Supported by the Young Scientists Fund of the National Natural Science Foundation of China ( No. 61805283)

More Information

Corresponding author: rjyfly@126.com
Received Date: 25 Sep 2019
Rev Recd Date: 21 Nov 2019
Publish Date: 01 Aug 2020

Abstract

Abstract

In this paper, the cross-spectral density function of target reflected light in laser detection is obtained by using generalized Huygens-Fresnel principle and Goodman target scattering theory. On the basis of above, the expression of intensity distribution and spatial coherence length of target reflected light is derived. The influence of different light source and target reflected light parameters on the intensity distribution and coherent length of the target reflected light is simulated by using the expressions obtained in this paper under turbulent atmospheric conditions. The results show that the coherence length of the light source has little effect on the normalized light intensity distribution; the coherence length of the received light is smaller with a larger beam waist radius and reflected light radius, and the coherence length increases at a slower rate as the transmission distance increases. In the process of weak turbulent atmospheric transmission, the influence of light source parameters on the received light is much stronger. The larger the beam waist radius, the smaller the received light intensity and coherence length value. During strong turbulent atmospheric transmission, the influence of atmospheric turbulence on the received light is dominant.
- laser detection,
- atmospheric turbulence,
- intensity distribution,
- coherence length

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References(17)

References

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