Abstract
The saturable absorption behavior of F<sub>2</sub><sup>-</sup> color centers in LiF is studied by picosecond laser pulse excitation (wavelength λ<sub>L</sub> = 1054 nm, duration Δ<i>t</i><sub><i>L</i></sub> = 6 ps). The color center number density, <i>N</i><sub>0</sub>, the ground-state absorption cross-section, σ<sub><i>L</i></sub>, and the single-photon excited-state absorption cross-section, σ<sub><i>ex,L</i></sub>, are determined by numerical fitting the energy density dependent energy transmission. A decrease of energy transmission at high excitation energy densities (<i>w</i><sub>0</sub><sub><i>L</i></sub> > 1 J cm<sup>-2</sup>) is attributed to two-photon absorption of other color centers (N<sub>1</sub> and N<sub>2</sub> bands of F<sub>4</sub> centers) present in the sample.
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