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The center of the Gaussian beam from solid laser cannot be completely aligned with the center of the spiral phase panel (SPP) while vortex beam is produced by SPP. The projecting beam from the SPP is actually an off-center vortex beam. Based on the diffraction theory, the propagation of off-center vortex beam is investigated. The analytic expressions of the electric field and the intensity are derived in the observation plane while the beam propagates a certain distance. It is shown that the intensity distribution of the beam changes asymmetricly. Besides the spreading, the core of the vortex beam moves while propagating, which is quite different from that of the ideal vortex beam. The magnitude of topological charge determines the spreading of the beam and has no influence on the motion of the vortex core. Furthermore, the sign of the topological charge determines the direction along which the core moves. If the topological charge is positive, the core will move in the tangential direction anticlockwise; if it is negative, the core will move in the tangential direction clockwise, from which the conclusion can provide a guidance for the beam aligning while the vortex beam is detected under the condition of long distance propagation.
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Keywords:
- vortex beam /
- off-center parameter /
- intensity distribution /
- topological charge
[1] Cheng K, Zhang H R, Lü B D 2010 Acta Phys. Sin. 59 246 (in Chinese) [程科, 张洪润, 吕百达 2010 59 246]
[2] Liu M, Chen X Y, Li H X, Song H S, Teng S Y, Cheng C F 2010 Acta Phys. Sin. 59 8490 (in Chinese) [刘曼, 陈小艺, 李海霞, 宋红胜, 滕树云, 程传福 2010 59 8490]
[3] Tian L H, Ye F W, Chen X F 2011 Opt. Express 19 11591
[4] Zhao Z X, Liu Y 2010 Chin. J. Laser 37 739 (in Chinese) [赵肇雄, 刘勇 2010 中国激光 37 739]
[5] Li Y Y, Chen Z Y, Liu H, Pu J X 2010 Acta Phys. Sin. 59 1740 (in Chinese) [李阳月, 陈子阳, 刘辉, 蒲继雄 2010 59 1740]
[6] Liu Y X, Chen Z Y, Pu J X 2011 Chin. J. Lasers 33 3 (in Chinese)[刘永欣, 陈子阳, 蒲继雄 2011 中国激光 33 3]
[7] Xie Q S, Zhao D M 2008 Opt. Commun. 281 7
[8] Han Y J, Zhao G H 2011 Opt. Lett. 36 2017
[9] Dai H T, Liu Y J, Luo D, Sun X W 2011 Opt. Lett. 36 1617
[10] Zhang W, Kuzyk M G 2006 Appl. Phys. Lett. 89 101103
[11] Mandel L, Wolf E 1995 Optical Coherence and Quantum Optics (Cambridge: Cambridge Univ. Press) p289
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[1] Cheng K, Zhang H R, Lü B D 2010 Acta Phys. Sin. 59 246 (in Chinese) [程科, 张洪润, 吕百达 2010 59 246]
[2] Liu M, Chen X Y, Li H X, Song H S, Teng S Y, Cheng C F 2010 Acta Phys. Sin. 59 8490 (in Chinese) [刘曼, 陈小艺, 李海霞, 宋红胜, 滕树云, 程传福 2010 59 8490]
[3] Tian L H, Ye F W, Chen X F 2011 Opt. Express 19 11591
[4] Zhao Z X, Liu Y 2010 Chin. J. Laser 37 739 (in Chinese) [赵肇雄, 刘勇 2010 中国激光 37 739]
[5] Li Y Y, Chen Z Y, Liu H, Pu J X 2010 Acta Phys. Sin. 59 1740 (in Chinese) [李阳月, 陈子阳, 刘辉, 蒲继雄 2010 59 1740]
[6] Liu Y X, Chen Z Y, Pu J X 2011 Chin. J. Lasers 33 3 (in Chinese)[刘永欣, 陈子阳, 蒲继雄 2011 中国激光 33 3]
[7] Xie Q S, Zhao D M 2008 Opt. Commun. 281 7
[8] Han Y J, Zhao G H 2011 Opt. Lett. 36 2017
[9] Dai H T, Liu Y J, Luo D, Sun X W 2011 Opt. Lett. 36 1617
[10] Zhang W, Kuzyk M G 2006 Appl. Phys. Lett. 89 101103
[11] Mandel L, Wolf E 1995 Optical Coherence and Quantum Optics (Cambridge: Cambridge Univ. Press) p289
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