Femtosecond crystallographic experiment in wide-bandgap LiF crystal.

Optics express (2011-03-04)
Hatem Dachraoui, Christian Oberer, Ulrich Heinzmann
ABSTRACT

We report a femtosecond crystallographic study of the dependence of the free-carries generation to the alignment of a crystalline sample to the laser polarization. The probe pulse transmission exhibits a π/2 modulation that is shown to be correlated with the direction dependence of the effective electron mass. This observation suggests that nonlinear ionization is the first channel for free electron generation during the laser pulse. Moreover, the temporal evolution of the probe pulse transmission indicates the dominance of the avalanche ionization and that nonlinear ionization provides the initial seed electrons for avalanche."

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lithium fluoride, ≥99.99% trace metals basis
Sigma-Aldrich
Lithium fluoride, powder, -300 mesh
Sigma-Aldrich
Lithium fluoride, powder, <100 μm, ≥99.98% trace metals basis
Sigma-Aldrich
Lithium fluoride, Precipitated, 99.995%
Sigma-Aldrich
Lithium fluoride, BioUltra, ≥99.0% (F)
Sigma-Aldrich
Lithium-6Li fluoride, 95 atom % 6Li, 99% (CP)