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Theoretical research of influence of laser intensity fluctuation on imaging quality degradation of coherent field
Alternative Title激光光强扰动对相干场成像降质影响理论研究
Cheng, Zhi-Yuan1; Ma, Cai-Wen1; Ma, Qing(2
Department光电测量技术实验室
2017-12-20
Source PublicationWuli Xuebao/Acta Physica Sinica
ISSN10003290
Volume66Issue:24
Contribution Rank1
AbstractThe laser coherent field imaging system emits multiple beams of laser from earth to space, and laser scans remote space target by passing through turbulence atmosphere. Multi-beam laser intensity fluctuation caused by atmosphere turbulence is a key factor affecting high-resolution imaging quality of the coherent field imaging system. Aiming at solving the problem of imaging quality degradation caused by laser intensity fluctuation error, we discuss the mechanism of laser intensity fluctuation error influencing the imaging quality of laser coherent field high-resolution imaging system. The theoretical model about the relationship between laser intensity fluctuation factor and imaging quality is proposed for the first time. Firstly, the laser echo field signal error induced by laser intensity amplitude fluctuation factor is deduced according to laser transmitting atmosphere theory. Then adopting multi-beam phase closure arithmetic, the phase closure coefficient error is derived from the laser intensity fluctuation factor and laser echo field signal. The mechanism of disturbed laser echo signal influencing phase closure coefficient is investigated in detail. In the following, based on reconstructed spectrum theory, the model of imaging frequency spectrum error propagation, caused by laser intensity fluctuation factor, is proposed. Finally, we reveal the mechanism of laser intensity amplitude fluctuation factor influencing reconstructed imaging frequency spectrum and imaging quality. The correctness and validity of the theoretical model are verified in simulation experiment. In the three-beam laser coherent field imaging simulation experiment, the imaging quality is evaluated by the Strehl ratio of the image. Experimental result shows that the Strehl ratio is only related to the light intensity fluctuation of one of the three beams of laser, and the greater the fluctuation of laser intensity, the more serious the degradation of imaging quality is. The research draws the conclusion that the reconstructed imaging frequency spectrum and image quality are mainly affected by the laser intensity fluctuation of the second beam in the three-beam phase closure algorithm, regardless of other two laser intensity fluctuations. Thus, in order to restrain the degradation of imaging quality caused by laser intensity fluctuation, we only need to keep stable the laser intensity of the second beam but not all of the laser beams. In this paper, we reveal the mechanism of laser intensity fluctuation affecting high-resolution imaging quality in the three-beam laser coherent field imaging system. The research provides a theoretical basis for analyzing imaging quality degradation from the laser intensity fluctuation caused by atmospheric turbulence, and reasonably assigning the light intensity stability of multi-beam laser emitter to improve the imaging quality in laser coherent field imaging system. © 2017 Chinese Physical Society.

DOI10.7498/aps.66.244202
Indexed BySCI ; EI ; CSCD
Language中文
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/30764
Collection光电测量技术实验室
Affiliation1.Xi'an Institute of Optics and Precision Mechnics of Chinese Acdemy of Science, Xi'an, 710119, China;
2.Xi'an University of Architecture and Technology, Xi'an, 710055, China
Recommended Citation
GB/T 7714
Cheng, Zhi-Yuan,Ma, Cai-Wen,Ma, Qing(2. Theoretical research of influence of laser intensity fluctuation on imaging quality degradation of coherent field[J]. Wuli Xuebao/Acta Physica Sinica,2017,66(24).
APA Cheng, Zhi-Yuan,Ma, Cai-Wen,&Ma, Qing.(2017).Theoretical research of influence of laser intensity fluctuation on imaging quality degradation of coherent field.Wuli Xuebao/Acta Physica Sinica,66(24).
MLA Cheng, Zhi-Yuan,et al."Theoretical research of influence of laser intensity fluctuation on imaging quality degradation of coherent field".Wuli Xuebao/Acta Physica Sinica 66.24(2017).
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