Quasi-one-dimensional diffuse laser cooling of atoms

We demonstrate experimentally the generation of one-dimensional cold gases $^{87}\mathrm{Rb}$ atoms by diffuse laser cooling. A horizontal slender vacuum glass tube with a length 105 cm and diameter 2 is used in our experiment. The light inside tube, which generated multireflection injected lasers, cools background vapor atoms. With 250 mW cooling 50 repumping light, an evenly distributed 1-m-long profile atom cloud obtained. observe factor 4 improvement atomic optical density for typical duration 170 ms sub-Doppler temperature 25 $\ensuremath{\mu}\mathrm{K}$. central number detected remains constant free-fall 30 ms. Such samples are ideal many quantum experiments involving electromagnetically induced transparency, electronically highly excited (Rydberg) atoms, precision measurements.