Three-dimensional cooling of cesium atoms in a reflecting copper cylinder

We present what is to our knowledge the first observation of spin-polarized atoms cooled within a reflecting cylinder in a high-power medium. A low-pr essure vapor of cesium atoms is stored in a glass cell whose volume is 58 c m(3). Cooling laser light (lambda = 852 nm) is injected into the cell by op tical fibers and is recycled by multiple reflections from the walls of the cylinder. The technique used in this experiment greatly simplifies the gene ration of laser-cooled atoms. A maximum of 2.5 X 10(8) cold atoms was detec ted by a time-of-flight technique. The damping of atomic motion has lead to temperatures as low as 3.5 muK. (C) 2001 Optical Society of America.