title: Realization of a new concept for visible frequency division: phase locking of harmonic and sum frequencies.
abstract: We explore and demonstrate the feasibility of an optical-frequency-to-radio-frequency division method that is based on visible or near-infrared laser oscillators only. Comparing harmonic and sum frequencies, we generate the arithmetic average of two visible frequencies. Cascading n stages provides difference-frequency division by 2(n). For a demonstration we have phase locked the second harmonic and the sum frequency of two independent diode lasers.
authors.forename: H R
authors.initials: HR
authors.lastname: Telle
authors.forename: D
authors.initials: D
authors.lastname: Meschede
authors.forename: T W
authors.initials: TW
authors.lastname: Hänsch