Spectroscopy of cold Strontium atoms with a sub-kHz linewidth AlGaInP semiconductor disk laser

Description

We report recent progress in sub-kHz-linewidth operation of AlGaInP-based SDL systems designed for neutral Strontium optical clocks. Overall system performance is presented, including intensity, frequency and phase noise characterisation. Two almost identical SDLs, each with >150 mW output at 689 nm, were frequency locked and an optical beat note measurement produced a linewidth of 160 Hz with fractional frequency stability reaching below 2×10^-15 for averaging times from 60-400 s. Spectroscopic measurements of a blue magneto-optical trap (MOT) of Strontium with one SDL resulted in a reduction of the atomic sample fluorescence and revealed Zeeman splitting of the ³P₁ electronic level.

Period	4 Feb 2020
Event title	SPIE Photonics West 2020
Event type	Conference
Location	San Francisco, United States, California
Degree of Recognition	International