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arXiv 2301.01971physics.optics
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向统计制度过渡的两种统计制度

Two statistical regimes in the transition to filamentation

Alexis Gomel, Geoffrey Gaulier, Debbie Eeltink, Maura Brunetti, Jérôme Kasparian

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8 pages, 5 figures
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摘要：

实验研究了超短激光脉冲在空气中传播时，接近于临界功率的光谱起伏。增加激光峰值功率使光谱变宽，同时光束接近双折射区。我们确定了两个制度的这种转变：在光谱的中心，输出光谱强度不断增加。相反，在光谱的边缘上，过渡意味着中间入射脉冲能量的双峰概率分布函数，其中高强度模式出现并以原始低强度模式为代价增长。我们认为，这种双重行为，防止定义一个univoquial阈值的约束，脱落的约束制度的边界长期缺乏明确的定义一个新的光。

英文摘要：

We experimentally investigate fluctuations in the spectrum of ultrashort laser pulses propagating in air, close to the critical power for filamentation. Increasing the laser peak power broadens the spectrum while the beam approaches the filamentation regime. We identify two regimes for this transition: In the center of the spectrum, the output spectral intensity increases continuously. In contrast, on the edges of the spectrum the transition implies a bimodal probability distribution function for intermediate incident pulse energies, where a high-intensity mode appears and grows at the expense of the original low-intensity mode. We argue that this dual behavior prevents the definition of a univoquial threshold for filamentation, shedding a new light on the long-standing lack of explicit definition of the boundary of the filamentation regime.

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