Abstract

Up to now, the only technique capable of generating millijoule-level sub-10-fs pulses is based on spectral broadening in a gas-filled capillary with subsequent compression. Even though this technique is routinely being used, the exact nature of the processes involved in white-light generation processes is not fully understood. We present a measurement approach that opens up a new window to understanding femtosecond continuum generation processes. Aside from yielding a better understanding of the underlying physical principles, this has direct implications in how the pulses are subsequently compressed. More importantly, it might provide the answer to the question of whether a phase-locked pulse keeps its lock during this process.

© 2002 Optical Society of America