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Q: Fachverband Quantenoptik und Photonik

Q 18: Laser and Laser Applications

Q 18.1: Talk

Tuesday, March 15, 2022, 10:30–10:45, Q-H15

Spectroscopy of High Pressure Rubidium-Helium-Mixtures — •Till Ockenfels, Paško Roje, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, D-53115 Bonn

Spectroscopy of alkali-buffer gas mixtures in a regime beyond the impact limit of collisional broadening is relevant in a wide range of fields, ranging from collisional redistribution laser cooling to laboratory astrophysics [1,2]. Here we report recent spectroscopic measurements of dense rubidium-helium gas mixtures recorded in a pressure cell equipped with soldered sapphire optical viewports, where the sapphire window is bonded to a metal flange via active soldering making use of a compound intermediate structure allowing to mediate thermally induced stress [3]. In the gas cell, we have recorded rubidium absorption and emission spectra subject to 250bar helium buffer gas pressure at 500K temperature. The spectra to good accuracy fulfill the Kennard-Stepanov Boltzmann-like frequency scaling of the ratio of absorption and emission spectral profiles.

[1] U. Vogl and M. Weitz, Nature 461, (2009).

[2] F. Bouhadjar et al., J. Phys. B 47 (2014).

[3] T. Ockenfels et al., Rev. Sci. Instrum. 92, 065109 (2021).