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

Paulo Hisao Moriya, Shengnan Zhang, Peter J. Schlosser, Yeshpal Singh, Kai Bongs, Jennifer E. Hastie

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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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.
Original languageEnglish
Title of host publicationProceedings SPIE 11263
Subtitle of host publicationVertical External Cavity Surface Emitting Lasers (VECSELs) X
Place of PublicationBellingham, Washington
Number of pages11
Publication statusPublished - 9 Mar 2020
EventSPIE Photonics West 2020 - Moscone Center, San Francisco, United States
Duration: 1 Feb 20206 Feb 2020


ConferenceSPIE Photonics West 2020
Country/TerritoryUnited States
CitySan Francisco
Internet address


  • spectroscopy
  • cold Strontium atoms
  • sub-kHz linewidth
  • AIGaInP semiconductor disk laser


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