Long-Lived Refractive-Index Changes Induced by Femtosecond Ionization in Gas-Filled Single-Ring Photonic-Crystal Fibers
| Autor: | Barbara M. Trabold, Felix Köttig, Francesco Tani, J. R. Koehler, Philip St. J. Russell |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Optical fiber FOS: Physical sciences Physics::Optics General Physics and Astronomy Nonlinear optics Photoionization Laser 01 natural sciences law.invention 010309 optics law Fiber laser 0103 physical sciences Femtosecond sense organs Atomic physics 010306 general physics Plasma recombination Physics - Optics Optics (physics.optics) Photonic-crystal fiber |
| Zdroj: | Physical Review Applied. 10 |
| ISSN: | 2331-7019 |
| Popis: | We investigate refractive index changes caused by femtosecond photoionization in a gas-filled hollow-core photonic crystal fiber. Using spatially-resolved interferometric side-probing, we find that these changes live for tens of microseconds after the photoionization event - eight orders of magnitude longer than the pulse duration. Oscillations in the megahertz frequency range are simultaneously observed, caused by mechanical vibrations of the thin-walled capillaries surrounding the hollow core. These two non-local effects can affect the propagation of a second pulse that arrives within their lifetime, which works out to repetition rates of tens of kilohertz. Filling the fiber with an atomically lighter gas significantly reduces ionization, lessening the strength of the refractive index changes. The results will be important for understanding the dynamics of gas-based fiber systems operating at high intensities and high repetition rates, when temporally non-local interactions between successive laser pulses become relevant. Comment: 5 pages with four figures and one table |
| Databáze: | OpenAIRE |
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