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Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

机译：湍流生物组织对连贯的Laguerre-Gaussian梁的繁殖特性的影响

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摘要

In this paper, the effects of turbulent biological tissues (TBT) on the propagation properties of the coherent Laguerre-Gaussian (CLG) beams are studied. Based on the turbulence theory and using the power spectrum refractive-index model, the expression formulae of the average irradiance intensity and spreading properties of a CLG beam propagating in TBT are derived. The influence of propagation distance, beam orders, wavelengths and tissue turbulence parameters are then investigated numerically. It found that, the central dark zone of the circular/elliptical LG beams rises more rapidly as the propagation distance and the structural constant of the refractive index of the biological tissue increase and the beams become eventually more like Gaussian beams in the far-field under the influence of the turbulence biological tissues. Also, the numerical results proved that the effective beam spot radius increases as turbulence, wavelength, and propagation distance are increasing. Ultimately, the beams become circular under the influence of the turbulence of the biological tissue. As found that the effective beam spot radius along the x-axis becomes equal to that of the y-axis in high TBT which explain why an elliptical LG beam is converted into a circular one in higher structural constant of the turbulent tissue. Moreover, our results show that, the influence of the beam order m slightly greater than that of l on the beam spreading.
机译：本文研究了湍流生物组织（TBT）对连贯的Laguerre-Gaussian（CLG）梁的传播特性的影响。基于湍流理论和使用功率谱折射率模型，推导了TBT中传播的CLG射线的平均辐照强度和扩散特性的表达式。然后在数值上研究传播距离，光束序列，波长和组织湍流参数的影响。它发现，随着传播距离和生物组织的折射率的传播距离和结构常数，圆形/椭圆Lg光束的中心暗区更快地升高，并且光束最终更像在远场下的高斯梁更像高斯梁湍流生物组织的影响。而且，数值结果证明了有效光束光斑半径随着湍流，波长和传播距离而增加。最终，梁在生物组织湍流的影响下变得圆形。如发现，沿X轴的有效束光射半径变得等于高TBT中的Y轴的半径，其解释了为什么椭圆形LG光束以湍流组织的较高结构常数转换成圆形一个。此外，我们的结果表明，光束顺序M的影响略大于L略微大的光束扩散。

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