Barr, J.R.M., Liang, G.Y. and Phillips, M.W.
Accurate optical frequency-interval measurement by use of nonresonant frequency comb generation.
Optics Letters, 18, (12), . (doi:10.1364/OL.18.001010).
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.
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