Heidelberg 2015 – wissenschaftliches Programm
A 17.8: Vortrag
Dienstag, 24. März 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 , 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.
 J.Stenger et al., Phys. Rev. Lett. 88, 073601 (2002)