Abstract
Optical parametric oscillators (OPOs) based on aperiodically-poled lithium niobate (APPLN) have generated 53 fs idler pulses at 3 μm that are nearly transform limited, and contain only five optical cycles;1 laser pulses with lessthan three optical cycles have been generated in other contexts.2 Against this background, the familiar slowly- varying envelope approximations (SVEAs) traditionally used to model nonlinear optical processes are clearly no longer satisfactory. New approaches are evidently needed that will not only offer a more secure analysis of present problems, but also provide a firm foundation for nonlinear optical experiments with even shorter pulses in the future.
© 2002 Optical Society of America
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