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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Dynamics and stability of cw and pulse lasers in Kerr optical media with K-photon absorption
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Dynamics and stability of cw and pulse lasers in Kerr optical media with K-photon absorption

机译：K-Photon吸收的Kerr光学介质中CW和脉冲激光的动力学和稳定性

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摘要

The laser dynamics in inscription processes involving transparent media is carried out, by considering an optical field propagating in a transparent medium with Kerr nonlinearity. The study takes into account multi-photon absorption phenomena, as well as a possible modification of the material structure resulting in the generation of a plasma of nearly free electrons. The model is described by a complex Ginzburg-Landau equation governing the laser dynamics, in which an extra Kth-order nonlinear term is induced by K-photon absorption processes. The model also takes into consideration the electron plasma generation via a linear term in the optical field. A global stability analysis of the system dynamics reveals a rich variety of fixed points consisting of no, one or two singular points in the amplitude-frequency plane. The modulational instability of plane waves gives rise to period-halving bifurcations in the continuous-wave amplitude growth rate, reminiscent of dominant multi-pulse structures in the nonlinear regime at large multi-photon absorption rate K. Pulses and multi-pulses are observed in numerical simulations of the nonlinear equations for the full system dynamics, the first structures are clearly associated with the case K = 2 whereas multi-pulse structures of increasing amplitudes and shorter perioids are dominant at larger values of K.
机译：通过考虑用克尔非线性在透明介质中传播的光场来执行涉及透明介质的铭文过程中的激光动力学。该研究考虑了多光子吸收现象，以及可能改变材料结构，导致产生几乎自由电子等离子体。该模型由控制激光动力学的复杂金茨堡 - Landau方程描述，其中通过K光子吸收过程诱导额外的kth阶非线性术语。该模型还考虑了通过光场中的线性术语考虑了电子等离子体。系统动力学的全局稳定性分析揭示了具有幅度频率平面中的NO，一个或两个奇点的丰富的固定点。平面波的调制不稳定性导致连续波幅度生长速率的周期 - 减半分叉，使得在大的多光子吸收率K中的非线性状态下的显性多脉冲结构。脉冲和多脉冲被观察到对于完整系统动态的非线性方程的数值模拟，第一结构与情况k = 2明显相关，而增加幅度和较短蛋白酶的多脉冲结构在较大的K较大值下显着。

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