Atom Laser:

A continuous wave (CW) atom laser based on a magnetically guided stream of cold atoms is investigated. An intense cold atomic source feeds atoms into one end of the guide. These atoms are launched along the guide using a 4-beam moving optical molasses and pumped into a magnetically guided Dark State. They are cooled via RF-induced Evaporative Cooling as they travel the length of the guide to achieve a hydrodynamic flow of cold atoms into the quantum degenerate regime. A 3-D potential minimum embedded in a linear atomic guide can be used to store the BEC at the end of the guide.

Project Update

Mallory defended her thesis on 5 April 2013. Here is a link to her presentation.
Look! Today (11/14/12) Matt made a secondary MOT in the new guide.
Guiding of Rydberg atoms in a
high-gradient magnetic guide

Physical Review A 86, 023414 (2012)
We study the guiding of 87Rb 59D5/2 Rydberg atoms in a linear, high-gradient, two-wire magnetic guide. Time-delayed microwave ionization and ion detection are used to probe the Rydberg atom motion. We observe guiding of Rydberg atoms over a period of 5 ms following excitation. The decay time of the guided-atom signal is about five times that of the initial state. We attribute the lifetime increase to an initial phase of l-changing collisions and thermally induced Rydberg-Rydberg transitions. Detailed simulations of Rydberg-atom guiding reproduce most experimental observations and offer insight into the internal-state evolution.
DAMOP 2012 poster
DAMOP 2011 abstract
Mallory presented a talk at DAMOP 2011 in June. The abstract is linked at the left.
Michigan Atom Guiding poster for the Midwestern Cold Atoms Workshop 2010
Ion imaging in a high-gradient magnetic guide
Review of Scientific Instruments 81, 043109 (2010)
We study a photoionization method to detect and image a narrow beam of cold atoms traveling along a high-gradient two-wire magnetic guide that is continuously on. Ions are accelerated in a compact acceleration region, directed through a drift region several centimeters in length, and detected using a position-sensitive ion detector. The potentials of several electrodes can be varied to adjust the imaging properties. Using ion trajectory simulations as well as experiments, we study the passage of the ions through the detection system, the magnification of the detection system, and the time-of-flight characteristics.
Final construction photo log
Problems, Solutions, and Moving On photo log
Wire nut photo log
Spring Break photo log
Interim photo log
February 12th photo log
February 11th photo log
February 10th photo log
Pre-Assembly photo log
The copper and teflon pieces together will act as a clamp for the waveplate mirror. The stainless steel piece is a lock for the stationary portion of the shutter.
A silicon strip between the guide wires will allow for surface adsorption evaporative cooling of the atoms as they are guided.
Mallory and Steven wrapped 12 coils for inside the vacuum chamber. As such, the coils had to be kept clean, thus the gloves. Coils are wrapped by hand-turning the lathe.
This is the first MOT in the new setup. It is big enough to be visible with the naked eye.
Construction has begun on the new guide. This shows the Zeeman slower, which will populate the first MOT. The new guide will sit on the near side of the table.

The Atom Laser project is funded primarily via joint grant from the Army Research Office and the Office of Naval Research. We would also like to acknowledge funds supporting the theoretical aspects of the project received from the Michigan Center for Theoretical Physics as well as student support received from FOCUS.
ARO logo ONR logo, FOCUS logo MCTP logo

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