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Difference-frequency combs in cold atom physics.

Kliese, R. and Hoghooghi, N. and Puppe, T. and Rohde, F. and Sell, A. and Zach, A. and Leisching, P. and Kaenders, W. and Keegan, N. C. and Bounds, A. D. and Bridge, E. M. and Leonard, J. and Adams, C. S. and Cornish, S. L. and Jones, M. P. A. (2016) 'Difference-frequency combs in cold atom physics.', The European physical journal : special topics., 225 (15). pp. 2775-2784.


Optical frequency combs provide the clockwork to relate optical frequencies to radio frequencies. Hence, combs allow optical frequencies to be measured with respect to a radio frequency where the accuracy is limited only by the reference signal. In order to provide a stable link between the radio and optical frequencies, the two parameters of the frequency comb must be fixed: the carrier envelope offset frequency, fceo, and the pulse repetition-rate, frep. We have developed the first optical frequency comb based on difference frequency generation (DFG) that eliminates fceo by design — specifically tailored for applications in cold atom physics. An fceo-free spectrum at 1550 nm is generated from a super continuum spanning more than an optical octave. Established amplification and frequency conversion techniques based on reliable telecom fibre technology allow the generation of multiple wavelength outputs. The DFG comb is a convenient tool to both stabilise laser sources and accurately measure optical frequencies in Rydberg experiments and more generally in quantum optics. In this paper we discuss the frequency comb design, characterization, and optical frequency measurement of Strontium Rydberg states. The DFG technique allows for a compact and robust, passively fceo stable frequency comb significantly improving reliability in practical applications.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:The final publication is available at Springer via
Date accepted:14 September 2016
Date deposited:14 February 2017
Date of first online publication:19 December 2016
Date first made open access:14 February 2017

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