Zusammenfassung
The saturable absorption behaviour of F-2 colour centres in LiF is studied by picosecond laser pulse excitation (wavelength lambda(L) = 1054 nm, duration Deltat(L) = 6 ps). The colour centre number density, N-u, the ground-state absorption cross-section, sigma(L), and the single-photon excited-state absorption cross-section, are determined by numerical fitting the energy density dependent energy ...
Zusammenfassung
The saturable absorption behaviour of F-2 colour centres in LiF is studied by picosecond laser pulse excitation (wavelength lambda(L) = 1054 nm, duration Deltat(L) = 6 ps). The colour centre number density, N-u, the ground-state absorption cross-section, sigma(L), and the single-photon excited-state absorption cross-section, are determined by numerical fitting the energy density dependent energy transmission. A decrease of energy transmission at high excitation energy densities (w(0L) > 1 J cm(-2)) is attributed to two-photon absorption of other colour centres (N-1 and N-2 bands of F-4 centres) present in the sample. (C) 2002 Elsevier Science B.V. All rights reserved.
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