Propagation stability of non-paraxial beam in nonlinear Kerr media is investigated with a linear stability method. Both theoretical analysis and numerical simulation show that modulation instability (MI) gain spectrum...Propagation stability of non-paraxial beam in nonlinear Kerr media is investigated with a linear stability method. Both theoretical analysis and numerical simulation show that modulation instability (MI) gain spectrum has three different distribution features determined by the times of incident power p0 and the non-paraxial parameter a. Furthermore, the corresponding criterion is put forward to distinguish the three different distributions. Key words non-paraxial beam - modulation instability(MI) - gain spectrum - Kerr media PASC 2001 42.65-k Project supported by the National Natural Science Foundation of China(Grant No. 60177020)展开更多
The propagation properties of partially coherent Hermite-Gaussian beams through non-Kolmogorov atmospheric turbulence are studied. The effects of non-Kolmogorov turbulence and beam nonparaxiality on the average intens...The propagation properties of partially coherent Hermite-Gaussian beams through non-Kolmogorov atmospheric turbulence are studied. The effects of non-Kolmogorov turbulence and beam nonparaxiality on the average intensity evolution and the beam-width spreading are stressed. It is found that the evolution of the average intensity distribution and the beam-width spreading depends on the generalized exponent factor, namely, on the non-Kolmogorov turbulence strength for the paraxial case. For the non-paraxial case the effect of the turbulence is negiigibl% while the beam-width spreading becomes very large. The analytical results are illustrated numerically and interpreted physically.展开更多
Optical vortex has attracted much interest re-cently due to its novel properties and applica-tions. In this paper, the focusing properties of Gaussian beam containing one non-spiral opti-cal vortex are investigated by...Optical vortex has attracted much interest re-cently due to its novel properties and applica-tions. In this paper, the focusing properties of Gaussian beam containing one non-spiral opti-cal vortex are investigated by means of scalar diffraction theory. Simulation results show that topological charge of non-spiral optical vortex affects optical intensity distribution in focal re-gion considerably, and non-spiral focal pattern may also occur. Multiple intensity peaks may appear companying with center main focal spot under condition of higher topological charge. In addition, the number of weak intensity peak outside of the center main intensity peak is re-lated to the value of topological charge.展开更多
文摘Propagation stability of non-paraxial beam in nonlinear Kerr media is investigated with a linear stability method. Both theoretical analysis and numerical simulation show that modulation instability (MI) gain spectrum has three different distribution features determined by the times of incident power p0 and the non-paraxial parameter a. Furthermore, the corresponding criterion is put forward to distinguish the three different distributions. Key words non-paraxial beam - modulation instability(MI) - gain spectrum - Kerr media PASC 2001 42.65-k Project supported by the National Natural Science Foundation of China(Grant No. 60177020)
基金Project supported by the National Natural Science Foundation of China (Grant No.10874125)
文摘The propagation properties of partially coherent Hermite-Gaussian beams through non-Kolmogorov atmospheric turbulence are studied. The effects of non-Kolmogorov turbulence and beam nonparaxiality on the average intensity evolution and the beam-width spreading are stressed. It is found that the evolution of the average intensity distribution and the beam-width spreading depends on the generalized exponent factor, namely, on the non-Kolmogorov turbulence strength for the paraxial case. For the non-paraxial case the effect of the turbulence is negiigibl% while the beam-width spreading becomes very large. The analytical results are illustrated numerically and interpreted physically.
文摘Optical vortex has attracted much interest re-cently due to its novel properties and applica-tions. In this paper, the focusing properties of Gaussian beam containing one non-spiral opti-cal vortex are investigated by means of scalar diffraction theory. Simulation results show that topological charge of non-spiral optical vortex affects optical intensity distribution in focal re-gion considerably, and non-spiral focal pattern may also occur. Multiple intensity peaks may appear companying with center main focal spot under condition of higher topological charge. In addition, the number of weak intensity peak outside of the center main intensity peak is re-lated to the value of topological charge.
