Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Laser development and applications II
Q 8.5: Talk
Monday, March 17, 2014, 15:00–15:15, DO26 207
Generation of a Narrow-Bandwith Ultraviolet Frequency Comb for Quantum Control of 9Be+ Ion Qubits — •Anna-Greta Paschke1, Malte Niemann1, Tino Lang1, Marco Marangoni2, Giulio Cerullo2, and Christian Ospelkaus1,3 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2Politecnico di Milano — 3PTB Braunschweig
A CPT test experiment based on a g-factor comparison between single trapped (anti-)protons is currently being designed in our group. The challenging spin-flip frequency measurement will be realized by transferring the (anti-)proton’s spin state to a co-trapped 9Be+-ion for readout, using quantum logic operations [1].
For the essential manipulation of 9Be+, a narrow-bandwidth ultraviolet (UV) pulsed laser system has been designed. To keep the required UV power acceptably low, the spectral bandwidth as well as the spectral profile of the laser pulses need to be precisely controlled.
We report on selective spectral compression of broadband 626nm pulses in second-order nonlinear BiBO crystals to obtain the desired narrowband UV pulses. The method [2] uses the second harmonic generation process in presence of large group velocity mismatch to efficiently transfer the energy of broadband fundamental frequency pulses into narrowband second harmonic ones. Compared to [2] an extension of the wavelength range into the UV (313 nm) has been realized, additionally including the considerable influence of spatial walkoff.
Heinzen and Wineland, PRA 42, 2977 (1990)
Marangoni et al., Opt. Expr. 15, 8884 (2007)