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

Moriya, P. (Speaker), Shengnan Zhang (Contributor), Peter Schlosser (Contributor), Yeshpal Singh (Contributor), Kai Bongs (Contributor), Hastie, J. (Contributor)

Activity: Talk or presentation typesOral presentation


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.
Period4 Feb 2020
Event titleSPIE Photonics West 2020
Event typeConference
LocationSan Francisco, United States, California
Degree of RecognitionInternational