Ultrafast time-resolved spectroscopy of a fs-laser-induced plasma inside glass using a super-continuum probe beam
| Autor: | Denise M. Krol, Jonathan J. Witcher, Javier Hernandez-Rueda |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science business.industry Physics::Optics 02 engineering and technology General Chemistry Plasma 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Optics law 0103 physical sciences Chromatic aberration Femtosecond General Materials Science Time-resolved spectroscopy Photonics 0210 nano-technology business Ultrashort pulse Gaussian optics |
| Zdroj: | Applied Physics A. 125 |
| ISSN: | 1432-0630 0947-8396 |
| Popis: | The light–energy coupling during femtosecond laser processing of glass is mediated by non-linear ionization mechanisms through the formation of an electron plasma. Its transient optical properties provide information about the density, temperature and scattering rate of the excited electrons. In turn, these properties strongly condition the features and size of the permanent optical modification near the focal volume that are desirable to fabricate photonic devices, such as optical waveguides inside transparent materials. Here, we report on the spectral response of a fs-laser-induced electron plasma inside fused silica by measuring its transient transmission using a broadband probe. We model the interaction of the probe beam with the plasma by combining Drude–Sommerfeld model with Gaussian optics. In this manner, we take into account both the laser–plasma interaction and the influence of the chromatic aberration inherent to a broadband-based system. We find good agreement between experiments at several processing energies and simulations and provide an estimate of the dielectric function of the excited material. |
| Databáze: | OpenAIRE |
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