title: Line narrowing and hole burning within the homogeneous linewidth: a new wave-mixing effect in two-level systems.
abstract: The interaction of strong low-area pulses with two-level systems shows absorption line narrowing and hole burning within the homogeneous linewidth as a result of nonlinear wave mixing. The wave mixing results from the two-level electronic saturation nonlinearity and occurs, depending on the sign of the pulse area, as a strong absorption enhancement or gain at the transition frequency of the two-level system for resonant excitation.
authors.forename: J
authors.initials: J
authors.lastname: Förstner
authors.forename: A
authors.initials: A
authors.lastname: Knorr
authors.forename: M
authors.initials: M
authors.lastname: Lindberg
authors.forename: S W
authors.initials: SW
authors.lastname: Koch