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Two statistical regimes in the transition to filamentation

Published inOptics express, vol. 31, no. 6, p. 9973-9980
Publication date2023-03-03
First online date2023-03-03
Abstract

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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Citation (ISO format)
GOMEL, Alexis et al. Two statistical regimes in the transition to filamentation. In: Optics express, 2023, vol. 31, n° 6, p. 9973–9980. doi: 10.1364/OE.483042
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ISSN of the journal1094-4087
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