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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Nonlinear propagation of a mixture of TEM00 and TEM01 modes of a laser beam in a cubic quintic medium
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Nonlinear propagation of a mixture of TEM00 and TEM01 modes of a laser beam in a cubic quintic medium

机译：立方五次介质中激光束的TEM00和TEM01模式的混合物的非线性传播

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摘要

We have presented an investigation on the characteristics of a laser beam. which is a mixture of two degenerate modes (TEM00) and TEM01), that is propagating through cubic quintic nonlinear media. Employing WKBJ method and paraxial ray approximation we have derived a pair of dynamical equations for the beam widths of the mixture of two modes. These equations are identical to two coupled nonlinear oscillators of mass unity. We have found that in the absence of quintic nonlinearity. stable propagation is possible for certain values of intensity ratio of two modes. whereas for other intensity ratios only quasi steady propagation is allowed. In the presence of quintic nonlinearity. stable propagation is allowed irrespective of the value of intensity ratio of two modes. Bound as well as unbound oscillatory regions have been identilied. It has been found that, higher values of quintic nonlinearity and the intensity of TEM01 mode reduce the amplitude of oscillations.
机译：我们已经对激光束的特性进行了研究。它是两种简并模态（TEM00）和TEM01的混合，通过三次五次非线性介质传播。利用WKBJ方法和近轴射线近似，我们得出了两种模式混合光束宽度的一对动力学方程。这些方程式与两个质量统一的耦合非线性振荡器相同。我们发现在没有五次非线性的情况下。对于两种模式的强度比的某些值，稳定的传播是可能的。而对于其他强度比，仅允许准稳态传播。存在五次非线性。不管两种模式的强度比值如何，都可以进行稳定的传播。绑定的和未绑定的振荡区域已被识别。已经发现，较高的五次非线性值和TEM01模式的强度会减小振荡幅度。

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