Abstract
Femtosecond pulses tunable in the 1.5-μm range have been generated by additive pulse mode-locking of the NaCl color-center laser by feeding part of the NaCl cavity output into a matched fiber cavity.1 Additive pulse mode-locking (APM) also leads to the generation of stable ultrashort pulses in a wide variety of solid-state lasers. There has thus been considerable interest in the mechanisms responsible for APM. The APM NaCl laser is self-starting2 and theoretical analyses of self-starting have been published recently.3 Here, we report an experimental study of the spectral dynamics leading to APM action in the NaCl laser, which shows unsuspected complexities.
© 1992 Optical Society of America
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