Supercontinuum generation in methane-filled hollow-core antiresonant fiber
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arXiv
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| Format: | Preprint |
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2024
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| author | Plosz, Balazs Lekosiotis, Athanasios Sabbah, Mohammad Belli, Federico Brahms, Christian Travers, John C. |
| author_facet | Plosz, Balazs Lekosiotis, Athanasios Sabbah, Mohammad Belli, Federico Brahms, Christian Travers, John C. |
| contents | We report the generation of a multi-octave supercontinuum spanning from 350 nm to 1700 nm with exceptional spectral flatness and high conversion efficiency to both the visible and near infrared region, by pumping a methane-filled hollow-core antiresonant fiber with 1030 nm laser pulses. The dynamics exhibited signs of both modulational instability and stimulated Raman scattering. Fiber lengths ranging from 15 to 200~cm were investigated along with gas pressures up to 50 bar and pump pulse durations from 220~fs up to 10~ps. The best supercontinuum, in terms of spectral width and flatness, was achieved with 220~fs pulses, 25~bar filling pressure, and 60~cm propagation length. Comparison with argon-filled fiber with matched nonlinearity and dispersion showed that the Raman contribution enhances the supercontinuum generation process compared to a pure modulational instability-based process. The average power was scaled up by increasing the pulse repetition rate to 50~kHz, but further scaling was hindered by linear and nonlinear absorption leading to fiber damage. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_16390 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Supercontinuum generation in methane-filled hollow-core antiresonant fiber Plosz, Balazs Lekosiotis, Athanasios Sabbah, Mohammad Belli, Federico Brahms, Christian Travers, John C. Optics We report the generation of a multi-octave supercontinuum spanning from 350 nm to 1700 nm with exceptional spectral flatness and high conversion efficiency to both the visible and near infrared region, by pumping a methane-filled hollow-core antiresonant fiber with 1030 nm laser pulses. The dynamics exhibited signs of both modulational instability and stimulated Raman scattering. Fiber lengths ranging from 15 to 200~cm were investigated along with gas pressures up to 50 bar and pump pulse durations from 220~fs up to 10~ps. The best supercontinuum, in terms of spectral width and flatness, was achieved with 220~fs pulses, 25~bar filling pressure, and 60~cm propagation length. Comparison with argon-filled fiber with matched nonlinearity and dispersion showed that the Raman contribution enhances the supercontinuum generation process compared to a pure modulational instability-based process. The average power was scaled up by increasing the pulse repetition rate to 50~kHz, but further scaling was hindered by linear and nonlinear absorption leading to fiber damage. |
| title | Supercontinuum generation in methane-filled hollow-core antiresonant fiber |
| topic | Optics |
| url | https://arxiv.org/abs/2411.16390 |