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arXiv 2103.17237physics.optics
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高能激光放大器中横模不稳定性的精确有效模拟

Accurate and Efficient Modeling of the Transverse Mode Instability in High Energy Laser Amplifiers

Curtis R. Menyuk, Joshua T. Young, Jonathan Hu, Andy J. Goers, David M. Brown, Michael L. Dennis

摘要:

本文研究了高阶模(HOM)存在时的横模不稳定性(TMI)。我们证明,当拍频长度之间的基本模式和HOM是小的长度尺度上的泵浦振幅和光模式的振幅变化相比,TMI是一个三波混频过程中,两个光学模式拍的相位匹配的折射率的分量,是由热光栅引起的。该极限是应用中的通常极限,并且在该极限下,TMI被识别为受激热瑞利散射(STRS)过程。我们证明了一个相位匹配的模型,是基于三波混频方程可以有一个大的计算优势,电流耦合模式的方法,必须使用的纵向步长相比,拍长小。

英文摘要:

We study the transverse mode instability (TMI) in the limit where a single higher-order mode (HOM) is present. We demonstrate that when the beat length between the fundamental mode and the HOM is small compared to the length scales on which the pump amplitude and the optical mode amplitudes vary, TMI is a three-wave mixing process in which the two optical modes beat with the phase-matched component of the index of refraction that is induced by the thermal grating. This limit is the usual limit in applications, and in this limit TMI is identified as a stimulated thermal Rayleigh scattering (STRS) process. We demonstrate that a phase-matched model that is based on the three-wave mixing equations can have a large computational advantage over current coupled mode methods that must use longitudinal step sizes that are small compared to the beat length.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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