Loss of Polarization in Collapsing Beams
| Autor: | Patwardhan, Gauri, Gao, Xiaohui, Sagiv, Amir, Dutt, Avik, Ginsberg, Jared, Ditkowski, Adi, Fibich, Gadi, Gaeta, Alexander |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 99, 033824 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.99.033824 |
| Popis: | We show theoretically and demonstrate experimentally that collapsing elliptically-polarized laser beams experience a nonlinear ellipse rotation that is highly sensitive to small fluctuations in the input power. For arbitrarily small fluctuations in the input power and after a sufficiently large propagation distance, the polarization angle becomes uniformly distributed in [0, 2$\pi$] from shot-to-shot. We term this novel phenomenon 'loss of polarization'. We perform experiments in fused-silica glass, nitrogen gas and water, and observe a significant increase in the fluctuations of the output polarization angle for elliptically-polarized femtosecond pulses as the power is increased beyond the critical power for self-focusing. We also show numerically and confirm experimentally that this effect is more prominent in the anomalous group-velocity dispersion (GVD) regime compared to the normal-GVD regime due to the extended lengths of the filaments for the former. Such effects could play an important role in intense-field light-matter interactions in which elliptically-polarized pulses are utilized. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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