scholarly journals Spatial-Temporal Self-Focusing of Partially Coherent Pulsed Beams in Dispersive Medium

2019 ◽  
Vol 9 (17) ◽  
pp. 3616 ◽  
Author(s):  
Zhiguo Zhao ◽  
Chaoliang Ding ◽  
Yongtao Zhang ◽  
Liuzhan Pan
Keyword(s):  
Fiber Optics ◽  
Pulse Shaping ◽  
Spatial Coherence ◽  
Optical Nonlinearity ◽  
Dispersive Media ◽  
Ghost Imaging ◽  
Partially Coherent ◽  
Self Focusing ◽  
Evolution Behavior ◽  
Temporal Intensity

Partially coherent pulsed beams have many applications in pulse shaping, fiber optics, ghost imaging, etc. In this paper, a novel class of partially coherent pulsed (PCP) sources with circular spatial coherence distribution and sinc temporal coherence distribution is introduced. The analytic formula for the spatial-temporal intensity of pulsed beams generated by this kind of source in dispersive media is derived. The evolution behavior of spatial-temporal intensity of the pulsed beams in water and air is investigated, respectively. It is found that the pulsed beams exhibit spatial-temporal self-focusing behavior upon propagation. Furthermore, a physical interpretation of the spatial-temporal self-focusing phenomenon is given. This is a phenomenon of optical nonlinearity, which may have potential application in laser micromachining and laser filamentation.

Ghost imaging and its visibility with partially coherent elliptical Gaussian Schell-model beams

2015 ◽  
Vol 379 (42) ◽  
pp. 2789-2794 ◽  
Author(s):  
Meilan Luo ◽  
Weiting Zhu ◽  
Daomu Zhao
Keyword(s):  
Ghost Imaging ◽  
Partially Coherent

Pulse splitting of self-focusing beams in normally dispersive media

1996 ◽  
Vol 53 (6) ◽  
pp. 4476-4480 ◽  
Author(s):  
Luc Bergé ◽  
Jens Juul Rasmussen
Keyword(s):  
Dispersive Media ◽  
Self Focusing ◽  
Pulse Splitting

scholarly journals Ghost Imaging with a Partially Coherent Beam Carrying Twist Phase in a Turbulent Ocean: A Numerical Approach

2019 ◽  
Vol 9 (15) ◽  
pp. 3023 ◽  
Author(s):  
Yonglei Liu ◽  
Xianlong Liu ◽  
Lin Liu ◽  
Fei Wang ◽  
Yuping Zhang ◽  
...  
Keyword(s):  
Numerical Approach ◽  
Coherent Beam ◽  
Ghost Imaging ◽  
Oceanic Turbulence ◽  
Partially Coherent ◽  
Rytov Approximation ◽  
Twist Factor ◽  
Imaging Approach ◽  
Optical Paths

Ghost imaging (GI) is an indirect imaging approach that can retrieve an object’s image even in a harsh environment through measuring the fourth-order correlation function (FOCF) between the signal and idle optical paths. In this paper, we study lensless GI with a partially coherent beam carrying twist phase, i.e., twisted Gaussian Schell-model (TGSM) beam, in the presence of oceanic turbulence. Explicit expression of the FOCF is derived based on the optical coherence theory and Rytov approximation, and the effects of the twist phase and the oceanic turbulence on the quality and visibility of image are investigated in detail through numerical examples. Our results show that the simulated oceanic turbulence strongly affects the GI. The quality of image decreases monotonously with an increase of the strength of turbulence whereas the visibility increases. When the illumination light carries a twist phase, the visibility of the image is improved while the quality of the image is reduced in contrast to those without a twist phase. By properly selecting the strength of the twist phase, the image can still be maintained at an acceptable level of quality with high visibility. Furthermore, it is found that the quality and visibility of the ghost image are less affected by the oceanic turbulence using a TGSM beam with larger twist factor. Our findings will be useful for the application of GI in an oceanic turbulent environment.

Self-focusing of chirped optical pulses in nonlinear dispersive media

1994 ◽  
Vol 49 (5) ◽  
pp. 4085-4092 ◽  
Author(s):  
X. D. Cao ◽  
G. P. Agrawal ◽  
C. J. McKinstrie
Keyword(s):  
Dispersive Media ◽  
Optical Pulses ◽  
Self Focusing
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