All-Optical BEC in a 1.06 micron dipole trap

TL;DR

This paper demonstrates the all-optical creation of a rubidium-87 Bose-Einstein condensate using a 1.06 micron dipole trap, detailing the loading, evaporation, and compression processes involved.

Contribution

It presents a novel method for producing BEC with a simple, single-wavelength dipole trap and provides insights into the thermal distribution challenges with shorter wavelength lasers.

Findings

Achieved BEC with 35,000 atoms after 3 seconds of evaporation.

Detailed analysis of thermal distribution in cross beam traps.

Identified potential difficulties with shorter wavelength laser trapping.

Abstract

We report the all-optical production of a Rb87 Bose-Einstein condensate (BEC) in a simple 1.06 micron dipole trap experiment. We load a single beam dipole trap directly from a magneto-optic trap (MOT) using an optimized loading sequence. After evaporation in the single beam, a second crossed beam is used for compression. The intensity in both beams is then reduced for evaporation to BEC. We obtain a BEC with 3.5E4 atoms after 3 seconds of total evaporation time. We also give a detailed account of the thermal distribution in cross beam traps. This account highlights the possible difficulties in using shorter wavelength lasers to condense all optically.