Non-Evaporative Cooling Using Spin-Exchange Collision in an Optical Trap
Abstract
This report describes, with references, three areas of research that addressed open questions relevant to the implementation of a novel nonevaporative cooling technique for ultracold gases, called collision-assisted Zeeman (CAZ) cooling. First, robust CAZ cooling requires efficient optical pumping in dense ultracold gases in which reabsorption of scattered photons is a serious limitation. Mitigation of reabsorption in such gases via the temporal and spatial modulation of light is reported. Second, the implementation of CAZ cooling requires that a sufficient number of 85Rb and 87Rb atoms be simultaneously trapped in an optical trap. The loading of 85Rb and 87Rb both singly and simultaneously in an optical trap from a Magneto-optical trap has been achieved and was optimized and characterized. Third, light-assisted collision rates in an 85Rb/87Rb mixture were measured in detail. These measurements were crucial to a full understanding of the relevant physics in simultaneously loading these two isotopes into an optical trap. As a result of all of this work, design criteria for collision-assisted Zeeman cooling have been met and exceeded.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 03, 2009
- Accession Number
- ADA498301
Entities
People
- Jacob L. Roberts
Organizations
- Colorado State University