Software for computer modeling of laser-pulse propagation through an optical system with nonlinear optical elements
Software for computer modeling of laser-pulse propagation through an optical system with nonlinear optical elements
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用于对通过具有非线性光学元件的光学系统的激光脉冲传播进行计算机建模的软件
DOI：
10.1117/12.326886
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
E. V. Van Stryland
中科院分区：
文献类型：
--
作者：
D. Kovsh;Sidney S. Yang;D. Hagan;E. V. Van Stryland
我们开发了一套计算机代码组织在一个软件包，使我们能够模拟高能量激光脉冲通过大块非线性光学介质的传播。模型中的非线性包括双光子吸收、电子克尔效应、激发态和自由载流子吸收沿着相关的电致伸缩和光声折射率变化。连续波光束，纳秒/皮秒脉冲和皮秒脉冲序列的传输被确定为各种空间分布的输入光束。我们使用了典型的激光输出的圆柱对称的空间几何形状，以减少CPU和内存的要求，使建模的PC上的实时任务，即使是重要的传播路径（许多瑞利范围）。数值输出的有效性进行了测试，对已知的结果为大范围的参数。特别是代码正在被用来调查和设计光学限幅设备与单一或多个元素的几何形状，以及限制器使用阶梯或梯度密度的非线性材料。线性传播模块集成了非线性光束传播方法（BPM）代码，可以模拟典型的实验，如Z扫描（聚焦光束中的样品位置变化）和限制实验（不同的输入能量值）。
We developed a set of computer codes organized in a software package that allows us to model high-energy laser pulse propagation through bulk nonlinear optical media. Nonlinearities included in the model are two-photon absorption, the electronic Kerr effect, excited-state and free-carrier absorption along with the associated electrostrictive and photo-acoustic refractive index change. The propagation of CW beams, nsec/psec pulses and picosecond pulse trains is determined for various spatial distributions of the input beam. We used a cylindrically symmetric spatial geometry typical for laser outputs to reduce the CPU and memory requirements making modeling a real-time task on PC's, even for significant propagation paths (many Rayleigh ranges). The validity of the numerical outputs was tested against known results for a large range of parameters. In particular the codes are being used to investigate and design optical limiting devices with single or multi-element geometries, as well as limiters using stepped or graded density of nonlinear material. The linear propagation module integrated with the nonlinear beam propagation method (BPM) codes allow the simulation of typical experiments such as Z-scan (sample position changes in a focused beam) and limiting experiments (different input energy values).