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Proceedings Paper

Relaxation processes in laser-excited dielectrics
Author(s): Nils Brouwer; Baerbel Rethfeld
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Paper Abstract

Ultrashort laser pulses generate free electrons in dielectrics and thus enable the absorption of laser energy. The electron density is a crucial parameter here, but also the energy distribution of the excited electrons plays a remarkable role. We calculate it in detail with help of full Boltzmann collision integrals. Here, we show a standard example of the evolution of the distribution function of electrons in valence- as well as in conduction band, and analyze the influence of different collision processes. The energy distribution can deviate from a Fermi distribution for several hundreds of femtoseconds, driven by an interplay of secondary ionization processes and the cooling by the lattice. We study in detail these relaxation processes and discuss their mutual influence.

Paper Details

Date Published: 16 February 2018
PDF: 9 pages
Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 105190P (16 February 2018); doi: 10.1117/12.2297217
Show Author Affiliations
Nils Brouwer, Technische Univ. Kaiserslautern (Germany)
Baerbel Rethfeld, Technische Univ. Kaiserslautern (Germany)


Published in SPIE Proceedings Vol. 10519:
Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII
Beat Neuenschwander; Costas P. Grigoropoulos; Tetsuya Makimura; Gediminas Račiukaitis, Editor(s)

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