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Laser‐Induced Coloration and Discoloration Processes in Alkali Halides
Author(s) -
Bichevin V.,
Käämbre H.
Publication year - 1994
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221860104
Subject(s) - laser , halide , alkali metal , excimer laser , irradiation , annihilation , bleach , kinetics , chemistry , photochemistry , materials science , analytical chemistry (journal) , optics , inorganic chemistry , physics , organic chemistry , quantum mechanics , nuclear physics
Abstract The coloration kinetics of KCI, KBr, KI, and NaCl crystals under XeCl excimer laser irradiation ( hv = 4.02 eV) at room temperature as well as laser‐induced discoloration of preliminarily X‐ray coloured crystals, including samples with M and R centres are studied. It can be concluded from the results that the achieved colour centre concentrations are determined by a dynamical equilibrium between laser two‐quantum coloration and a concomitant one‐quantum bleaching of the created centres. Most probably the bleaching proceeds via the laser‐light‐induced destruction of the F centre complementaries, V centres and annihilation of some produced mobile products (H interstitials?) with F centres. The X‐ray‐created F centres seem to bleach more rapidly than the laser‐created ones.