Unified model of femtosecond laser ionization in bulk solid dielectrics

Sergey I. Kudryashov

doi:10.1117/12.646660

28 February 2006 Unified model of femtosecond laser ionization in bulk solid dielectrics

Sergey I. Kudryashov

Proceedings Volume 6108, Commercial and Biomedical Applications of Ultrafast Lasers VI; 61080N (2006) https://doi.org/10.1117/12.646660
Event: Lasers and Applications in Science and Engineering, 2006, San Jose, California, United States

Abstract

Ionization dynamics based on various ionization and carrier-loss mechanisms is theoretically studied for bulk crystalline and amorphous solid dielectrics irradiated by ultrashort (femtosecond) laser pulses. Multi-photon ionization is found to be predominant at low laser intensities (I_las ∼ 10 TW/cm²) with small contribution of avalanche process, which is more significant for amorphous, rather than crystalline materials. At higher intensities - I_las ~ 10² TW/cm² - ionization is considerably enhanced by transient bandgap renormalization due to ultrafast ac-Stark effect and multi-particle interactions in electron-hole plasma, but is strongly damped by Auger recombination for electron-hole plasma densities N_e > 10²⁰ cm^-3 and accompanied by microscopic damage of corresponding dielectric materials.

Citation Download Citation

Sergey I. Kudryashov "Unified model of femtosecond laser ionization in bulk solid dielectrics", Proc. SPIE 6108, Commercial and Biomedical Applications of Ultrafast Lasers VI, 61080N (28 February 2006); https://doi.org/10.1117/12.646660

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