The propagation of long-wavelength pulses is affected by a multitude of near-resonant rovibrational transitions in atmospheric constituents, of which water vapor is generally the most abundant. We extract the pure nonlinear response of these transitions from a high-resolution transmission-based effective model, which is additive to the spectrally resolved linear response, and study the influence of this on the propagation of laser pulses and pulse trains. Compared to simulations with only electronic Kerr self-focusing, we find that the nonlinear rovibrational response introduces an additional modification to strongly self-focused laser pulses and stark changes to pulses that are close to the self-focusing threshold.

中文翻译：

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长波长红外脉冲和脉冲序列传播中的非线性振动响应

长波脉冲的传播受到大气成分中大量近共振旋转振动跃迁的影响，其中水蒸气通常是最丰富的。我们从高分辨率的基于传输的有效模型中提取了这些跃迁的纯非线性响应，并将其添加到光谱解析的线性响应中，并研究了其对激光脉冲和脉冲序列传播的影响。与仅使用电子Kerr自聚焦的仿真相比，我们发现非线性振动响应对强自聚焦激光脉冲进行了附加修改，并对接近自聚焦阈值的脉冲进行了明显改变。