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A: Fachverband Atomphysik
A 28: Poster Session - Atomic Physics IV
A 28.25: Poster
Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof
A laser system for creating ground state 23Na40K molecules — •Akira Kamijo1, Roman Bause1, Xing-Yan Chen1, Marcel Duda1, Andreas Schindewolf1, Immanuel Bloch1,2, and Xin-Yu Luo1 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Ludwig-Maximilians-Universität, München, Germany
Ultra-cold polar molecules in their ground state offer unique possibilities to investigate quantum many-body systems due to their long-ranged dipole-dipole interaction. In our experiment, ultra-cold 23Na40K molecules are transferred to their electronic, vibrational and rotational ground state via stimulated Raman adiabatic passage (STIRAP). This work focuses on the design and construction of a new STIRAP system following previous work at MIT [1] and Hefei [2]. An intermediate state in the B/c manifold is used, resulting in STIRAP transitions at 805 nm and 567 nm. To generate the 567 nm laser, the output of a 1134 nm external cavity diode laser is injection amplified by a gain chip to 250 mW and subsequently converted to 567 nm light by a periodically poled Lithium Niobate waveguide. 805 nm light is generated by a diode laser and amplified by a tapered amplifier. Using only solid-state lasers allows the system to be robust and easy to maintain. To ensure mutual coherence of these lasers, they are locked to a dual wavelength ultra-low expansion cavity allowing relative line widths of 1012 or lower.
[1] Park, J. W. et al. Phys. Rev. Lett. 114, 205302 (2015)
[2] Liu, L. et al. Phys. Rev. Lett. 122, 253201 (2019)