Abstract
Self-phase modulation in optical fibers and subsequent chirp compensation in a linear optical element has become a well-established method to compress light pulses.1 The shortest pulses obtained so far in this manner have a duration of 6 fs.2 The interaction lengths required in the nonlinear medium depend on the input pulse duration and intensity3’4 and amount from several millimeters (femtosecond pulses) up to kilometers (picosecond to nanosecond pulses). Such lengths are easy to be realized using single-mode fibers. This, however, has the disadvantage that due to the required tight focusing (several microns core diameter) the pulse energy cannot exceed a certain (relatively low) value to avoid undesired nonlinear effects.5 For femtosecond light pulses the energy which can be utilized is limited to only several nanojoules.2
© 1988 Optical Society of America
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