Lithium fluoride crystals with F2 color centers (CC) are well known as passive Q-switchers of neodimium lasers and as active elements of effective tunable lasers working from 1.09 to 1.27 μm.1 Excited- state lifetime of F2 CC is about 70 ns. Due to the long decay time LiF:F2 CC crystals can hardly be used for passive mode-locking of neodimium lasers. In 1983 30-m-long YAG:Nd3+ laser was passively mode locked with LiF:F2 crystal.2 The lifetime of F2 CC was comparative with cavity round trip time in this experiment.

© 1994 Optical Society of America

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