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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.55: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Frequency-Quadrupled 285nm Diode Laser System for Photoionization of Mg using LBO as a Second Harmonic Generation Crystal — •Stephan Duewel, Martin Enderlein, Thomas Huber, Johannes Stroehle, Christian Schneider, and Tobias Schaetz — MPI für Quantenoptik

Trapped Mg ions have shown to be a good candidate for quantum simulations[1,2]. Ionization using electron bombardment has turned out to be disadvantageous causing long time degradation of trapping conditions. In our current setup, Mg ions are produced out of a thermal atomic beam by a photoionization laser system generating several mW of 285nm single mode laser light via one SHG resonator from a dye laser at 570nm. However, dye lasers and their optical pumps are expensive and work intensive to maintain and operate. An alternative is frequencyquadrupling of a diode laser at 1140nm, previously realized using periodically poled LiNbO3 in the first SHG cavity[3]. We report on an all solid state frequency-quadrupling system pumped by a diode laser at 1140nm, using an LBO crystal for SHG in the first resonator. Despite its low non-linear coefficient of only 0.82pm/V, we are currently able to achieve 9.5mW at 570nm from a pump power of 70mW and optimize the system for a doubling efficiency of 20% of the first SHG at a pump power of 100mW. This should provide on the order of 0.5mW at 280nm, sufficient for efficient photoionization.

[1] A. Friedenauer et al., Nat. Phys. 4, 757-761 (2008)

[2] H. Schmitz et al., Phys. Rev. Lett. 103, 090504 (2009)

[3] D. Nigg, Master's thesis, Universität Innsbruck (2009)