Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.11: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

VECSEL system for quantum manipulation of trapped magnesium ions — •Till Rehmert1,2, Maximilian J. Zawierucha2, Jan Christoph Heip2, Fabian Wolf2, and Piet O. Schmidt1,21Leibniz Universität Hannover, Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

Optical pumped vertical-external-cavity surface-emitting lasers (VECSEL) have been demonstrated to be a promising technology for applications ranging from spectroscopy to quantum computing and quantum simulation [1]. VECSELs combine compact size and high optical power and the advantage of a wide wavelength coverage.

We employ a gain mirror from Vexlum Ltd consisting of GaInAs/GaAs quantum wells strained with GaAsP layers to achieve a centre wavelength of 1118 nm with a tuning range of 30 nm [2]. With an optical-to-optical efficiency of approximately 25% we achieve up to 5 watts of optical output power.

For quantum logic spectroscopy with trapped magnesium ions the 1118 nm light has to be frequency doubled twice to access our target wavelength of 280 nm. We expect an overall UV output power of 20 mW and a laser linewidth of tens of MHz which allows us to use it for Doppler cooling, repumping and Raman transition.

[1] Burd et al, Optica Vol.3, No. 12 (2016)

[2] Ranta et al, J. Cryst. Growth 355, 4-9 (2011)

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