Investigation on the formation of intense fringe near nonlinear medium slab in nonlinear imaging

It is well known that hot images of small-scale scatterers can be formed. For phase-typed scatterers, hot image and second-order hot-image can be formed. However, when the number of scatterer is larger than one, the interaction between the scatterered waves will lead to new nonlinear propagation results. In this paper, the propagation of flat-topped intense laser beam through Kerr medium slab is investigated, with the incident beam modulated by two parallel wirelike phase-typed scatterers. We demonstrate that an intense fringe together with hot image and second-order hot image can be formed when the distance of the two scatterers is several millimeters. It is found that the on-axis position of the plane of this intense fringe is in the middle part between the exit surface of the Kerr medium slab and the secondorder hot image plane. This intense fringe shows the following basic properties: Firstly, its intensity is apparently higher than that of corresponding second-order hot image and can be comparable with that of corresponding hot image; Secondly, the distances between it and the in-beam positions of the scatterers are identical. The intensity profile shows that this intense fringe is the only prominent bright fringe in the corresponding plane, and thus it is not a nonlinear image of any scatterer. Besides, the influences of the properties of scatterer on the intensity of the fringe are discussed.

[1]  Jianlin Zhao,et al.  Theory of nonlinear hot-image formation in high-power lasers , 2005, International Commission for Optics.

[2]  K. Manes,et al.  Hot images from obscurations. , 1993, Applied optics.

[3]  Zhao Jianlin,et al.  Analysis of the evolvement of hot-image in case of thick nonlinear medium , 2007 .

[4]  Wang You-Wen,et al.  Suppression of nonlinear imaging in high-power laser by pulse bandwidth , 2007 .

[5]  Jianlin Zhao,et al.  Second-order hot image from a scatterer in high-power laser systems. , 2005, Applied optics.

[6]  朱健强 Zhu Jianqiang,et al.  Small-Scale Self-Focusing of Divergent Beams in Gain Medium , 2009 .

[7]  Jianbo Xu,et al.  Nonlinear imaging properties under the coeffect of two wirelike opaque scatterers , 2013 .

[8]  Jianlin Zhao,et al.  Nonlinear hot-image formation of an intense laser beam in media with gain and loss , 2004 .

[9]  胡勇华,et al.  Nonlinear images of scatterers in chirped pulsed laser beams , 2010 .

[10]  Yi Shen,et al.  Investigation on the formation of second-order-hot-image-like fringes , 2014, Photonics Asia.

[11]  Shuming Chen,et al.  Investigation on the intense fringe formation phenomenon downstream hot-image plane. , 2015, Optics express.

[12]  Yonghua Hu,et al.  Nonlinear formation of hot image and double intense image for gain-typed wirelike scatterers , 2014 .

[13]  Wen Shuang-chun.  Non-paraxial Propagation of Optical Beams in Nonlinear Self-focusing Media , 2001 .

[14]  D Milam,et al.  Nonlinear holographic imaging of phase errors. , 1998, Applied optics.

[15]  Wang Wenyi,et al.  Theoretical analysis of hot image effect from phase scatterer , 2005 .

[16]  Jianlin Zhao,et al.  Simulation analysis of the restraining effect of a spatial filter on a hot image. , 2007, Applied optics.

[17]  王友文 Wang Youwen,et al.  Dependence of Nonlinear Hot Image of Intense Laser Beam on the Thickness of Kerr Medium , 2008 .