Abstract
Passive Mode Locking (PML) is an intrinsically nonlinear effect. Its nonlinear core is a saturable absorber, which favors pulses, since it attenuates them the least. Nevertheless, pulsation is achieved only when optical power reaches a certain threshold, so that the absorbers’ nonlinearity is “felt” strongly enough. This suggests that there is a mechanism in the laser that opposes mode locking, which needs to be overcome.
© 2002 Optical Society of America
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