title: Period doubling of a femtosecond Ti:sapphire laser by total mode locking.
abstract: Period doubling of an 84-MHz repetition-rate Kerr-lens mode-locked Ti:sapphire laser operated at 830 nm and producing ~300mW of average power has been observed and explained in terms of total mode locking of TEM(00) and TEM(01) modes in an effective confocal cavity. This configuration leads to a spatial sweeping action of a single-peaked pulse at 42 MHz. Period tripling and quadrupling is observed for certain cavity configurations.
authors: D
authors: D
authors: Côté
authors: H M
authors: HM
authors: van Driel