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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

An ultraviolet diode laser system for laser cooling trapped ytterbium ions

Jonathan A. Cox, Marko Cetina, Franz X. Käertner, D. Kielpinski

Published Jun 1, 2006• 0 citations
Publisher

Abstract

We describe the design and performance of an ultraviolet diode laser system for laser cooling trapped ytterbium ions without frequency doubling. The performance is similar to resonantly doubled laser systems, but with greater efficiency, reduced size, expense and fragility. The system achieved laser cooling of ytterbium ions in a linear Paul trap to less than 270 mK. No shorter wavelength laser has previously been used for laser cooling

DOI
10.1109/freq.2006.275422

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We describe the design and performance of an ultraviolet diode laser system for laser cooling trapped ytterbium ions without frequency doubling. The performance is similar to resonantly doubled laser systems, but with greater efficiency, reduced size, expense and fragility. The system achieved laser cooling of ytterbium ions in a linear Paul trap to less than 270 mK. No shorter wavelength laser has previously been used for laser cooling
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Calcium ions are laser cooled in a Paul trap by use of a grating-stabilized UV laser diode. Unusual quantum jumps or fluctuations in the fluorescence signal are observed without application of any shelving lasers. It has become clear that such phenomena can be ascribed to shelving transitions induced by background 393-nm spontaneous photons emitted from the laser medium. Shelving transitions are suppressed by use of an interference filter, and the ions are successfully cooled to crystallization temperature with sufficient reproducibility.
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We have built an external-cavity ultraviolet diode laser at 397 nm for Ca+ spectroscopy. The laser consists of a commercial ultraviolet diode laser and a holographic grating in the Littrow configuration. Stable single-mode operation with a power of 3 mW, a linewidth no larger than 2 MHz, and a mode-hop-free frequency scanning range of 15 GHz was achieved. This laser was used to cool a small number of Ca+ in a rf trap. The ions were cooled to a low temperature to form a crystallized state. The use of the laser will simplify experimental setups for diverse applications of Ca+, such as frequency standards, quantum computers and one-atom lasers.