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Q: Fachverband Quantenoptik und Photonik

Q 44: Laser Development and Applications

Q 44.6: Vortrag

Donnerstag, 12. März 2020, 12:15–12:30, f435

Linewidth-reduced DBR laser for Raman sideband cooling — •Pooja Malik, Lukas Ahlheit, Wolfgang Alt, Maximilian Ammenwerth, Tobias Macha, Deepak Pandey, Hannes Pfeifer, Eduardo Uruñuela, and Dieter Meschede — Institut für Angewandte Physik, Wegelerstr. 8, 53115, Bonn, Germany

Raman sideband cooling is an established ground state cooling technique, especially suited for experiments involving one or few atoms. It uses a two photon Raman transition that is driven by two lasers phase locked at around the hyperfine splitting of the atomic species. This is implemented in our experiment with Rb87 atoms that are trapped inside a fiber Fabry-Pérot cavity for photon storage experiments [1]. One of the employed Raman lasers is a DBR laser that offers a mode hop free tuning range of hundreds of GHz. Phase locking is however hampered by the large intrinsic linewidth of some MHz. Here we show how this limitation can be overcome by using an external optical feedback reducing the linewidth of our DBR laser [2], while maintaining its GHz tuning range. By means of a delayed self heterodyne method supported by a numerical noise model [3], we identify different noise components and the Lorentzian linewidth below 30kHz. We demonstrate near ground state cooling of single atoms using this linewidth-reduced laser.

[1] T. Macha et al., arXiv:1903.10922v2 (2019)
[2] Q. Lin et al., Opt. Lett. 37, 1989-1991 (2012)
[3] W. Ma et al., Appl. Opt. 58, 3555-3563 (2019)