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The high intracavity intensity of self-modelocked Ti:sapphire lasers leads to strong self-phase modulation (SPM) of the modelocked pulses, and the long Ti:sapphire gain medium induces large positive group-velocity dispersion (GVD). To obtain the shortest pulses, negative group-velocity dispersion must be induced to compensate the SPM and the GVD. Therefore, the short pulse travelling in a Ti:sapphire laser will be broadened and shortened intermittently, that is to say, the pulse widths at variant positions in the cavity are different.
© 1994 Optical Society of America
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