Ultrafast time-resolved spectroscopy of a fs-laser-induced plasma inside glass using a super-continuum probe beam

Javier Hernandez-Rueda, Jonathan J. Witcher, Denise M. Krol

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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.

Original languageEnglish
Article number591
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume125
Issue number9
DOIs
Publication statusPublished - 2019
Externally publishedYes

Fingerprint Dive into the research topics of 'Ultrafast time-resolved spectroscopy of a fs-laser-induced plasma inside glass using a super-continuum probe beam'. Together they form a unique fingerprint.

  • Cite this