title: Phase correlation of laser waves with arbitrary frequency spacing.
abstract: The theoretically predicted correlation of laser phase fluctuations in Lambda-type interaction schemes is experimentally demonstrated. We show that the mechanism of correlation in a Lambda scheme is restricted to high-frequency noise components, whereas in a double-Lambda scheme, due to the laser phase locking in a closed-loop interaction, it extends to all noise frequencies. In this case the correlation is weakly sensitive to coherence losses. Thus the double-Lambda scheme can be used to correlate electromagnetic fields with carrier frequency differences beyond the GHz regime.
authors.affiliation: Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria.
authors.forename: A F
authors.initials: AF
authors.lastname: Huss
authors.forename: R
authors.initials: R
authors.lastname: Lammegger
authors.forename: C
authors.initials: C
authors.lastname: Neureiter
authors.forename: E A
authors.initials: EA
authors.lastname: Korsunsky
authors.forename: L
authors.initials: L
authors.lastname: Windholz