arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.06707physics.opticsnlin.PS
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宇称时间对称激光器的非线性行为

Nonlinear behaviors of parity-time-symmetric lasers

Jianke Yang

摘要:

本文提出了一个含时偏微分方程模型来研究宇称-时间(PT)对称激光器在非线性工作阶段的动力学行为。该模型综合考虑了折射率分布、色散、材料损耗、非线性增益饱和和自相位调制等物理效应。我们发现,当损耗较弱时,在激光阈值以上存在多个稳定的稳态和时间周期态,使激光器多模。然而,当损耗很强时,对于很宽的增益幅度范围,仅存在单一的PT对称性破缺的稳定稳态,使得激光器为单模。这些结果揭示了损耗在维持PT激光器单模工作中的重要作用。

英文摘要:

We propose a time-dependent partial differential equation model to investigate the dynamical behavior of the parity-time (PT) symmetric laser during the nonlinear stage of its operation. This model incorporates physical effects such as the refractive index distribution, dispersion, material loss, nonlinear gain saturation and self-phase modulation. We show that when the loss is weak, multiple stable steady states and time-periodic states of light exist above the lasing threshold, rendering the laser multi-mode. However, when the loss is strong, only a single stable steady state of broken PT symmetry exists for a wide range of the gain amplitude, rendering the laser single-mode. These results reveal the important role the loss plays in maintaining the single-mode operation of PT lasers.

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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