Special Section on Laser Damage III

Modeling the transient optical parameters in laser-excited band gap materials

[+] Author Affiliations
Anika Rämer, Baerbel Rethfeld

University of Kaiserslautern, Department of Physics and State Research Center OPTIMAS, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany

Lasse Haahr-Lillevang, Peter Balling

Aarhus University, Department of Physics and Astronomy, Ny Munkegade 120, 8000 Århus C, Denmark

Opt. Eng. 56(1), 011015 (Sep 08, 2016). doi:10.1117/1.OE.56.1.011015
History: Received June 2, 2016; Accepted August 12, 2016
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Abstract.  When band gap materials are irradiated with an ultrashort laser pulse, the free-carrier density increases tremendously. The resulting abrupt transformation from an insulator to a conducting material, where a large portion of the electrons is excited to the conduction band, induces huge changes in the optical parameters. The transient nature of these parameters is often modeled based on the Drude model, where there is much uncertainty concerning the Drude collision frequency. As this frequency has a great impact on the modeling results, this work discusses several approaches to its treatment. Additionally, we compare simulation results to experimental data discussing shortcomings of the Drude model in combination with a collision frequency based on Debye screening for dilute plasmas.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Anika Rämer ; Lasse Haahr-Lillevang ; Baerbel Rethfeld and Peter Balling
"Modeling the transient optical parameters in laser-excited band gap materials", Opt. Eng. 56(1), 011015 (Sep 08, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011015


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