Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster: Quantum Optics and Photonics III
Q 53.19: Poster
Donnerstag, 9. März 2017, 17:00–19:00, P OG2
Design and construction of a Perpetual Atom Laser Machine — •Chun-Chia Chen, Shayne Bennetts, Benjamin Pasquiou, and Florian Schreck — Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands
We have developed a machine aimed at producing a perpetual atom laser, a long standing goal within atomic physics. Continuous production of Bose-Einstein condensate (BEC) or an atom laser requires two incompatible cooling processes, laser cooling a gas sample, then cooling evaporatively until degeneracy is reached. In order to produce a perpetual output these stages take place simultaneously in different parts of our machine. To protect the condensate from scattered photon heating we use a combination of physical separation, baffles and a "transparency" beam. Our machine has now demonstrated a perpetual MOT of 2× 109 88Sr atoms with temperatures as low as 20µK on a 7.4-kHz wide laser cooling transition with a continuous loading rate of 7× 108 atoms/s. Using a different set of parameters and location we have also demonstrated a perpetual MOT of 2× 108 88Sr at 2µK with a loading rate of 9× 107 atoms/s which we have successfully loaded into a dipole trap. By switching to the 0.5% abundance 84Sr isotope we are able to evaporate to BECs of 3× 105 84Sr atoms. Critically, for the second location we have validated the effectiveness of our architecture in protecting a BEC from scattered broad-linewidth laser cooling light, which is used in the first cooling stages. We will describe our design and the performance demonstrated so far.