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Conference on Precision Electromagnetic Measurements

Diode-laser-based light sources for laser cooling of trapped Yb/sup +/ ions

K. Sugiyama, A. Wakita, A. Nakata

Published Nov 7, 2002• 4 citations
Publisher

Abstract

We are developing a light source at 370 nm for driving the /sup 2/S/sub 1/2/-/sup 2/P/sub 1/2/ cooling transition by sum-frequency mixing of radiation from two diode lasers with a doubly resonant external cavity. To drive the /sup 2/D/sub 3/2/-/sup 3/D[3/2]/sub 1/2/ repumping transition at 935 nm, we developed two types of external cavity diode lasers. Applications of them to laser-cooled trapped Yb/sup +/ ions are also presented.

DOI
10.1109/cpem.2000.851105

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We are developing a light source at 370 nm for driving the /sup 2/S/sub 1/2/-/sup 2/P/sub 1/2/ cooling transition by sum-frequency mixing of radiation from two diode lasers with a doubly resonant external cavity. To drive the /sup 2/D/sub 3/2/-/sup 3/D[3/2]/sub 1/2/ repumping transition at 935 nm, we developed two types of external cavity diode lasers. Applications of them to laser-cooled trapped Yb/sup +/ ions are also presented.
The development of an all-solid-state systems of lasers is described for the cooling and probing of strontium ions in a radio-frequency (rf) trap. The Sr+ ions created within the rf trap are laser cooled by repeated cycling on the 422 nm 2S1/2 - 2P1/2 resonance transition. The 422 nm light was generated from a single mode 70 mW 844 nm diode laser, whose output was frequency doubled to 422 nm in a KNbO3 crystal inside a resonant enhancement cavity. Decays from the Sr+ upper resonance level into the 2D3/2 metastable state remove ions from the cooling cycle. This loss was prevented by driving the 1092 nm 2D3/2 - 2P1/2 transition using a Nd3+-doped fiber laser, diode-pumped at 826 nm. The 2S1/2 - 2D5/2 optical 'clock' transition at 674 nm has a natural linewidth of 0.4 Hz and may be probed with an AlGaInP laser diode. The laser diodes at 844 nm and 674 nm are both collimated using a piezo-mounted GRIN rod which also provides longitudinal mode selection. The spectral output is optically narrowed using resonant optical feedback.
We have fabricated an rf ion trap and laser-cooling light sources to observe shelving transition in a single calcium ion. All the radiation required for laser cooling and observation of the transition can be prepared with diode lasers in this system. Continuous-wave radiation at 397 nm for laser cooling was generated by frequency doubling of a GaAlAs laser in an external enhancement cavity. As a preliminary experiment for observing the shelving transition, laser cooling of one hundred calcium ions was demonstrated using this radiation and another diode laser.
We generate coherent ultraviolet radiation at 313 nm as the third harmonic of an external-cavity diode laser. We use this radiation for laser cooling of trapped beryllium atomic ions and sympathetic cooling of co-trapped beryllium-hydride molecular ions. An LBO crystal in an enhancement cavity generates the second harmonic, and a BBO crystal in a doubly resonant enhancement cavity mixes this second harmonic with the fundamental to produce the third harmonic. Each enhancement cavity is preceded by a tapered amplifier to increase the fundamental light. The 36-mW output power of this all-semiconductor-gain system will enable quantum control of the beryllium ions' motion.