title: Accurate optical frequency-interval measurement by use of nonresonant frequency comb generation.
abstract: A novel technique for measuring the separation of widely spaced optical frequencies is demonstrated. It relies on frequency comb generation by use of a laser that incorporates a frequency-shifting element. A Nd:YLF laser is used to produce a frequency comb that has a bandwidth of 140 GHz and that contains in excess of 875 discrete frequencies, accurately spaced by 160 MHz. The longitudinal mode spacing of a dual-frequency laser was measured to an accuracy of +/-5 kHz in 3,733,440.0 kHz by use of the technique described here.
authors.forename: J R
authors.initials: JR
authors.lastname: Barr
authors.forename: G Y
authors.initials: GY
authors.lastname: Liang
authors.forename: M W
authors.initials: MW
authors.lastname: Phillips