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

Abstract

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 $5s5p$ ${}^3{P}_2\to 5s5d$ ${}^3{D}_3$ transition might be of interest for sub-Doppler cooling.

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Cited by in corpus (5)

• Analyzing a single-laser repumping scheme for efficient loading of a strontium magneto-optical trap
• Optical pumping of ${5s4d}^1{\mathrm{D}}_2$ strontium atoms for laser cooling and imaging
• A simple, powerful diode laser system for atomic physics
• Nonresonant Casimir-Polder repulsion with a monolayer topological insulator
• Sub-Doppler cooling of bosonic strontium in a two-color MOT