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A method for multiple sub-beams coherently emitting is put forward to improve the ability of laser to detect small targets in a long distance. The laser beam is split into many sub-beams with equal power parallelly emitted to the target in a certain arrangement. The sub-beams produce interference pattern on the target plane due to the fact that they are from the same laser source and have good coherence. Calculated results show that an interference peak is produced. Ideally, the maximum intensity would be N times as large as the intensity of the single beam emitted directly, where N is the number of the sub-beams. The detection is realized by using the interference peaks, and it will benefit especially to the detection of small targets. Beams divergence should be reduced to let a greater power to the target. In order to control the light intensity instability and the spot distortion, the jitters of the emitting mirrors must be controlled as well. Results show that a position accuracy of 0.1λ and an angle accuracy of 0.2θ are needed to have a stable and ideal interference peak, where λ is the wavelength and θ is the divergence angle of the beam.
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Keywords:
- laser detection /
- small target /
- interference of beams
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[2] Johnson S E 2012 Appl. Opt. 51 4139
[3] Dang W J, Zeng X D, Feng Z J 2013 Acta Phys. Sin. 62 024204 (in Chinese) [党文佳, 曾晓东, 冯喆珺 2013 物理学报 62 024204]
[4] Guo Y L, Lu M, Tan Z G, Wan J W 2012 Chinese J. Lasers 39 0209003 (in Chinese) [郭裕兰, 鲁敏, 谭志国, 万建伟 2012 中国激光 39 0209003]
[5] Di H G, Hua D X, Wang Y F, Yan Q 2013 Acta Phys. Sin. 62 094215 (in Chinese) [狄慧鸽, 华灯鑫, 王玉峰, 闫庆 2013 物理学报 62 094215]
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[7] Qu F Q, Hu Y H, Jiao J J, Dong B 2013 Acta Photonica Sinica 42 48 (in Chinese) [瞿福琪, 胡以华, 焦均均, 董彬 2013 光子学报 42 48]
[8] Liu C B, Zhao S B, Han X E 2012 Infrared and Laser Engineering 41 1244 (in Chinese) [刘春波, 赵少博, 韩香娥 2012 红外与激光工程 41 1244]
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[10] Zhang S B Guo L, Li M L, Zhang L, Yan X, Hou W, Lin X C, Li J M 2012 Chin. Opt. Lett. 10 071401
[11] Wang Y Y, Xu D G, Liu C M, Wang W P, Yao J Q 2012 Chin. Phys. B 21 094212
[12] Zhou S H, Zhao H, Tang X J 2009 Chinese J. Lasers 36 1605 (in Chinese) [周寿桓, 赵鸿, 唐小军 2009 中国激光 36 1605]
[13] Yan R P, Yu X, Chen D Y, Chen F, Li X D, Ma Y F, Yu J H 2012 Chin. Phys. B 21 024208
[14] Wu B L, Rao C H 2007 Acta Optica Sinica 27 967 [吴碧琳, 饶长辉 2007 光学学报 27 967]
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[1] Yu W Y, An L Q 2012 Acta Phys. Sin. 61 218703 (in Chinese) [于文英, 安里千 2012 物理学报 61 218703]
[2] Johnson S E 2012 Appl. Opt. 51 4139
[3] Dang W J, Zeng X D, Feng Z J 2013 Acta Phys. Sin. 62 024204 (in Chinese) [党文佳, 曾晓东, 冯喆珺 2013 物理学报 62 024204]
[4] Guo Y L, Lu M, Tan Z G, Wan J W 2012 Chinese J. Lasers 39 0209003 (in Chinese) [郭裕兰, 鲁敏, 谭志国, 万建伟 2012 中国激光 39 0209003]
[5] Di H G, Hua D X, Wang Y F, Yan Q 2013 Acta Phys. Sin. 62 094215 (in Chinese) [狄慧鸽, 华灯鑫, 王玉峰, 闫庆 2013 物理学报 62 094215]
[6] Hao W F, Li F, Yan J G, Zhang J, Su X L 2012 Chinese J. Geophys. 55 47 (in Chinese) [郝卫峰, 李斐, 鄢建国, 张杰, 苏晓丽 2012 地球物理学报 55 47]
[7] Qu F Q, Hu Y H, Jiao J J, Dong B 2013 Acta Photonica Sinica 42 48 (in Chinese) [瞿福琪, 胡以华, 焦均均, 董彬 2013 光子学报 42 48]
[8] Liu C B, Zhao S B, Han X E 2012 Infrared and Laser Engineering 41 1244 (in Chinese) [刘春波, 赵少博, 韩香娥 2012 红外与激光工程 41 1244]
[9] Yun J, Gao C X, Zhu S L, Sun C D, He H D, Feng L, Dong L J, Niu L Q 2012 Chin. Opt. Lett. 10 121402
[10] Zhang S B Guo L, Li M L, Zhang L, Yan X, Hou W, Lin X C, Li J M 2012 Chin. Opt. Lett. 10 071401
[11] Wang Y Y, Xu D G, Liu C M, Wang W P, Yao J Q 2012 Chin. Phys. B 21 094212
[12] Zhou S H, Zhao H, Tang X J 2009 Chinese J. Lasers 36 1605 (in Chinese) [周寿桓, 赵鸿, 唐小军 2009 中国激光 36 1605]
[13] Yan R P, Yu X, Chen D Y, Chen F, Li X D, Ma Y F, Yu J H 2012 Chin. Phys. B 21 024208
[14] Wu B L, Rao C H 2007 Acta Optica Sinica 27 967 [吴碧琳, 饶长辉 2007 光学学报 27 967]
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