Spark-Induced Shockwave Dynamics Revealed via Nonresonant Four-Wave Mixing
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866917299738378240 |
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| author | Kounalakis, Marios Shneider, Mikhail N. Gerakis, Alexandros |
| author_facet | Kounalakis, Marios Shneider, Mikhail N. Gerakis, Alexandros |
| contents | We report on the experimental detection of shockwave dynamics produced in a spark discharge, using a nonresonant four-wave mixing optical technique. In particular, we observe the spark-induced local density perturbation across a millimeter-range probe volume, centered on the discharge, via single-shot coherent Rayleigh-Brillouin scattering. We detect the emergence of shock-induced flow velocities, which appear as distinct features in the spectrum, and monitor their dynamic evolution from a few hundred nanoseconds to microseconds after the spark. Finally, we benchmark our measurements against simulations based on a one-dimensional compressible flow model. Our results pave the way for quantitative measurements of highly non-uniform transient flows in challenging environments featuring non-equilibrium gas kinetics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_24112 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spark-Induced Shockwave Dynamics Revealed via Nonresonant Four-Wave Mixing Kounalakis, Marios Shneider, Mikhail N. Gerakis, Alexandros Optics Applied Physics Plasma Physics We report on the experimental detection of shockwave dynamics produced in a spark discharge, using a nonresonant four-wave mixing optical technique. In particular, we observe the spark-induced local density perturbation across a millimeter-range probe volume, centered on the discharge, via single-shot coherent Rayleigh-Brillouin scattering. We detect the emergence of shock-induced flow velocities, which appear as distinct features in the spectrum, and monitor their dynamic evolution from a few hundred nanoseconds to microseconds after the spark. Finally, we benchmark our measurements against simulations based on a one-dimensional compressible flow model. Our results pave the way for quantitative measurements of highly non-uniform transient flows in challenging environments featuring non-equilibrium gas kinetics. |
| title | Spark-Induced Shockwave Dynamics Revealed via Nonresonant Four-Wave Mixing |
| topic | Optics Applied Physics Plasma Physics |
| url | https://arxiv.org/abs/2602.24112 |