Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 29: Precision Measurements and Metrology IV (with A)

Q 29.8: Talk

Tuesday, March 24, 2015, 16:15–16:30, P/H1

Suppressing high-frequency noise in phase-locks to fiber frequency combs — •Nils Scharnhorst, Jannes B. Wübbena, Stephan Hannig, Ian D. Leroux, and Piet O. Schmidt — QUEST Institute of Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt and Leibniz Universität Hannover, Bundesallee 100, D-38116 Braunschweig, Germany

We demonstrate a high-bandwidth transfer-lock scheme which is capable of transferring short-term stability from a stable master laser to an otherwise free-running diode laser at 729 nm via a frequency comb.

Limited by the intrinsic noise of the comb at high Fourier-frequencies and the available feddback bandwidth, we synthesize a virtual beat signal for the 729 nm laser in which the effect of the comb noise is suppressed by microwave feed-forward electronics, a so-called transfer-oscillator lock [1], circumventing a tight comb lock.

By eliminating the need for auxiliary reference cavities for laser pre-stabilization at each wavelength, this capability allows a substantial simplification of experimental setups requiring multiple stable lasers, such as high-accuracy frequency standards based on quantum logic spectroscopy, experiments in Rydberg spectroscopy, or coherent photoassociation and control of molecules with Raman pulses.

[1] J.Stenger et al., Phys. Rev. Lett. 88, 073601 (2002)