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The 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.
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Keywords:
- laser intensity fluctuation /
- frequency spectrum error /
- imaging quality /
- laser coherent field imaging
[1] Yao W Q, Huang W H, Yang C P 2017 Acta Phys. Sin. 66 034201 (in Chinese) [姚伟强, 黄文浩, 杨初平 2017 66 034201]
[2] Zhuang J Y, Chen Q, He W J, Mao T Y 2016 Acta Phys. Sin. 65 040501 (in Chinese) [庄佳衍, 陈钱, 何伟基, 冒添逸 2016 65 040501]
[3] Holmes R B, Brinkley T 1999 Proc. SPIE 3815 11
[4] Cuellar E L, Cooper J, Mathis J, Fairchild P 2008 Proc. SPIE 7094 70940G
[5] Ye S, Liu Y, Wu J 2011 High Power Laser and Particle Beams 23 611 (in Chinese) [叶溯, 刘艺, 吴健 2011 强激光与粒子束 23 611]
[6] Li Y 2013 Ph. D. Dissertation (Xi'an: Chinese Academy Scienses University) (in Chinese) [李杨 2013博士学位论文 (西安: 中国科学院大学)]
[7] Cheng Z Y, Ma C W, Luo X J, Zhang Y, Zhu X P, Xia A L 2015 Acta Phys. Sin. 64 124203 (in Chinese) [程志远, 马彩文, 罗秀娟, 张羽, 朱香平, 夏爱利 2015 64 124203]
[8] Zhang W X, Xiang L B, Kong X X, Li Y, Wu Z, Zhou Z S 2013 Acta Phys. Sin. 62 164203 (in Chinese) [张文喜, 相里斌, 孔新新, 李扬, 伍洲, 周志胜 2013 62 164203]
[9] Yu S H, Dong L, Liu X Y, Ling J Y 2015 Acta Phys. Sin. 64 184205 (in Chinese) [于树海, 董磊, 刘欣悦, 凌剑勇 2015 64 184205]
[10] Belen'kii M, Hughes K, Brinkley T 2002 Proc. SPIE 4821 62
[11] Cheng Z Y, Luo X J, Ma C W, Zhang Y, Liu H, Zhu X P 2015 Acta Photon. Sin. 44 0407002 (in Chinese) [程志远, 罗秀娟, 马彩文, 张羽, 刘辉, 朱香平 2015 光子学报 44 0407002]
[12] Yu S H, Wang J L, Dong L, Liu X Y, Wang G C 2013 Acta Opt. Sin. 33 0811001 (in Chinese) [于树海, 王建立, 董磊, 刘欣悦, 王国聪 2013 光学学报 33 0811001]
[13] Zhou Z X, Xiang L B, Zhang W X, Li Y 2014 Acta Opt. Sin. 34 0511005 (in Chinese) [周志盛, 相里斌, 张文喜, 李杨 2014 光学学报 34 0511005]
[14] Yu S H, Wang J L, Dong L, Liu X Y, Wang L 2015 Opt. Precision Eng. 23 282 (in Chinese) [于树海, 王建立, 董磊, 刘欣悦, 王亮 2015 光学精密工程 23 282]
[15] Liu Y Y, L Q B, Zhang W X 2012 Acta Phys. Sin. 61 124201 (in Chinese) [刘扬阳, 吕群波, 张文喜 2012 61 124201]
[16] Li Y, Xiang L B, Zhang W X 2013 High Power Laser and Particle Beams 25 292 (in Chinese) [李扬, 相里斌, 张文喜 2013 强激光与粒子束 25 292]
[17] Cuellar E L, Stapp J, Cooper J 2005 Proc. SPIE 5896 58960D
[18] Stapp J, Spivey B, Chen L, et al. 2006 Proc. SPIE 6307 630701
[19] Rhodes W T 2012 Appl. Opt. 51 A11
[20] Yu S H, Wang J L, Dong L, Liu X Y 2014 Acta Photon. Sin. 43 0601002 (in Chinese) [曾志红, 罗秀娟, 王保峰, 夏爱利, 程志远, 司庆丹 2014 光子学报 43 0601002]
[21] Zeng Z H, Luo X J, Wang B F, Xia A L, Cheng Z Y, Si Q D 2014 Acta Photon. Sin. 43 0601002 (in Chinese) [曾志红, 罗秀娟, 王保峰, 夏爱利, 程志远, 司庆丹 2014 光子学报 43 0601002]
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[1] Yao W Q, Huang W H, Yang C P 2017 Acta Phys. Sin. 66 034201 (in Chinese) [姚伟强, 黄文浩, 杨初平 2017 66 034201]
[2] Zhuang J Y, Chen Q, He W J, Mao T Y 2016 Acta Phys. Sin. 65 040501 (in Chinese) [庄佳衍, 陈钱, 何伟基, 冒添逸 2016 65 040501]
[3] Holmes R B, Brinkley T 1999 Proc. SPIE 3815 11
[4] Cuellar E L, Cooper J, Mathis J, Fairchild P 2008 Proc. SPIE 7094 70940G
[5] Ye S, Liu Y, Wu J 2011 High Power Laser and Particle Beams 23 611 (in Chinese) [叶溯, 刘艺, 吴健 2011 强激光与粒子束 23 611]
[6] Li Y 2013 Ph. D. Dissertation (Xi'an: Chinese Academy Scienses University) (in Chinese) [李杨 2013博士学位论文 (西安: 中国科学院大学)]
[7] Cheng Z Y, Ma C W, Luo X J, Zhang Y, Zhu X P, Xia A L 2015 Acta Phys. Sin. 64 124203 (in Chinese) [程志远, 马彩文, 罗秀娟, 张羽, 朱香平, 夏爱利 2015 64 124203]
[8] Zhang W X, Xiang L B, Kong X X, Li Y, Wu Z, Zhou Z S 2013 Acta Phys. Sin. 62 164203 (in Chinese) [张文喜, 相里斌, 孔新新, 李扬, 伍洲, 周志胜 2013 62 164203]
[9] Yu S H, Dong L, Liu X Y, Ling J Y 2015 Acta Phys. Sin. 64 184205 (in Chinese) [于树海, 董磊, 刘欣悦, 凌剑勇 2015 64 184205]
[10] Belen'kii M, Hughes K, Brinkley T 2002 Proc. SPIE 4821 62
[11] Cheng Z Y, Luo X J, Ma C W, Zhang Y, Liu H, Zhu X P 2015 Acta Photon. Sin. 44 0407002 (in Chinese) [程志远, 罗秀娟, 马彩文, 张羽, 刘辉, 朱香平 2015 光子学报 44 0407002]
[12] Yu S H, Wang J L, Dong L, Liu X Y, Wang G C 2013 Acta Opt. Sin. 33 0811001 (in Chinese) [于树海, 王建立, 董磊, 刘欣悦, 王国聪 2013 光学学报 33 0811001]
[13] Zhou Z X, Xiang L B, Zhang W X, Li Y 2014 Acta Opt. Sin. 34 0511005 (in Chinese) [周志盛, 相里斌, 张文喜, 李杨 2014 光学学报 34 0511005]
[14] Yu S H, Wang J L, Dong L, Liu X Y, Wang L 2015 Opt. Precision Eng. 23 282 (in Chinese) [于树海, 王建立, 董磊, 刘欣悦, 王亮 2015 光学精密工程 23 282]
[15] Liu Y Y, L Q B, Zhang W X 2012 Acta Phys. Sin. 61 124201 (in Chinese) [刘扬阳, 吕群波, 张文喜 2012 61 124201]
[16] Li Y, Xiang L B, Zhang W X 2013 High Power Laser and Particle Beams 25 292 (in Chinese) [李扬, 相里斌, 张文喜 2013 强激光与粒子束 25 292]
[17] Cuellar E L, Stapp J, Cooper J 2005 Proc. SPIE 5896 58960D
[18] Stapp J, Spivey B, Chen L, et al. 2006 Proc. SPIE 6307 630701
[19] Rhodes W T 2012 Appl. Opt. 51 A11
[20] Yu S H, Wang J L, Dong L, Liu X Y 2014 Acta Photon. Sin. 43 0601002 (in Chinese) [曾志红, 罗秀娟, 王保峰, 夏爱利, 程志远, 司庆丹 2014 光子学报 43 0601002]
[21] Zeng Z H, Luo X J, Wang B F, Xia A L, Cheng Z Y, Si Q D 2014 Acta Photon. Sin. 43 0601002 (in Chinese) [曾志红, 罗秀娟, 王保峰, 夏爱利, 程志远, 司庆丹 2014 光子学报 43 0601002]
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