Optical control of the density and spin spatial profiles of a planar Bose gas

TL;DR

This paper demonstrates precise optical control of density and spin profiles in a two-dimensional Bose gas using a digital micromirror device, enabling arbitrary potential shaping with high resolution and feedback optimization.

Contribution

It introduces a method for arbitrary optical potential shaping and spin distribution engineering in a 2D Bose gas using a DMD with feedback control.

Findings

Achieved micron-scale resolution in density profile shaping.

Implemented feedback loop for optimized density distribution.

Engineered arbitrary spin distributions via Raman transfer.

Abstract

We demonstrate the arbitrary control of the density profile of a two-dimensional Bose gas by shaping the optical potential applied to the atoms. We use a digital micromirror device (DMD) directly imaged onto the atomic cloud through a high resolution imaging system. Our approach relies on averaging the response of many pixels of the DMD over the diffraction spot of the imaging system, which allows us to create an optical potential with arbitrary grey levels and with micron-scale resolution. The obtained density distribution is optimized with a feedback loop based on the measured absorption images of the cloud. Using the same device, we also engineer arbitrary spin distributions thanks to a two-photon Raman transfer between internal ground states.