Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

Moriya, Paulo Hisao; Araújo, Michelle O.; Todão, Fagner R; Hemmerling, M.; Keßler, Hans; Shiozaki, R. F.; Teixeira, Renata Cordeiro; Courteille, Ph. W.

doi:10.48550/arxiv.1806.09176

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“…Due to the availability of laser sources the majority of strontium lattice clocks use two repump lasers addressing the 3 P 2 → 3 S 1 transition at 707 nm and the 3 P 0 → 3 S 1 transition at 679 nm. Alternatively, only a single repump laser addressing the 3 P 2 → 3 D 2 transition at 496.93 nm may be used [15,16]. Until now the generation of light at this wavelength relied on second harmonic generation (SHG) from an infrared laser due to the lack of laser diodes directly operating in this range.…”

Section: Introductionmentioning

confidence: 99%

An extended-cavity diode laser at 497 nm for laser cooling and trapping of neutral strontium

Schkolnik¹,

Fartmann²,

Krutzik

2019

Laser Phys.

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We present the first extended-cavity diode laser in Littrow configuration operating in the cyan wavelength range around 497 nm. The gallium-nitride based diode laser features a free-space output with up to 60 mW, operates in a single frequency mode, is tunable over a range of more than 8 nm and has a Lorentzian linewidth of less than 90 kHz. A detailed characterization of the tuning capabilities of the diode laser and its emission spectrum is provided. This compact, simple and low cost laser source replaces more complex systems based on frequency doubling and therefore simplifies the development of future compact and mobile optical clocks based on neutral strontium. Applications include efficient repumping of strontium atoms from the 5s5p 3 P 2 state and the 9.8 MHz broad 5s5p 3 P 2 → 5s5d 3 D 3 transition might be of interest for sub-Doppler cooling.

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Section: Introductionmentioning

confidence: 99%