Journal
LASER PHYSICS
Volume 16, Issue 2, Pages 331-335Publisher
IOP PUBLISHING LTD
DOI: 10.1134/S1054660X06020216
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Color centers are lattice vacancy defects trapping electrons or holes. They are easily created in single crystals by irradiation with ionizing radiation. We report the production of color centers in LiF and LiYF4 single crystals by ultrashort high-intensity laser pulses (60 fs, 12.5 GW). An intensity threshold for color center creation of 1.9 and 2 TW/cm(2) was determined in YLF and LiF, respectively, which is slightly smaller than the continuum generation threshold. Due to the high energy density of the coherent radiation of the focused laser beam, we were able to identify a large amount of F centers, which gave rise to aggregates such as F-2, F-2(+), and F-3(+). The proposed mechanism of formation is based on multiphoton excitation, which also produces short-lived F-2(+) centers. It is also shown that it is possible to write tracks in the LiF crystals with dimensional control.
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