title: Attosecond active synchronization of passively mode-locked lasers by balanced cross correlation.
abstract: A balanced cross correlator, the optical equivalent of a balanced microwave phase detector, is demonstrated. Its use in synchronizing an octave-spanning Ti:sapphire laser and a 30-fs Cr:forsterite laser yields 300-attosecond timing jitter measured from 10 mHz to 2.3 MHz. The spectral overlap between the two lasers is strong enough to permit direct detection of the difference in carrier-envelope offset frequency between the two lasers.
authors.affiliation: Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. schibli@mit.edu
authors.forename: T R
authors.initials: TR
authors.lastname: Schibli
authors.forename: J
authors.initials: J
authors.lastname: Kim
authors.forename: O
authors.initials: O
authors.lastname: Kuzucu
authors.forename: J T
authors.initials: JT
authors.lastname: Gopinath
authors.forename: S N
authors.initials: SN
authors.lastname: Tandon
authors.forename: G S
authors.initials: GS
authors.lastname: Petrich
authors.forename: L A
authors.initials: LA
authors.lastname: Kolodziejski
authors.forename: J G
authors.initials: JG
authors.lastname: Fujimoto
authors.forename: E P
authors.initials: EP
authors.lastname: Ippen
authors.forename: F X
authors.initials: FX
authors.lastname: Kaertner