Calibrating the absorption imaging of cold atoms under high magnetic fields
arXiv:2304.12716 · doi:10.1103/PhysRevApplied.20.014037
Abstract
We develop a theoretical model for calibrating the absorption imaging of cold atoms under high magnetic fields. Comparing to zero or low magnetic fields, the efficiency of the absorption imaging becomes lower while it requires an additional correction factor to obtain the absolute atom number under the Beer-Lambert law. Our model is based on the rate equations and can account many experimental imperfections such as Zeeman level crossing, failures of hyperfine structures, off-resonant couplings, and low repumping efficiency, etc. Based on this method, we can precisely calculate the correction factor for atom number measurement without any empirical or fitting parameters. Meanwhile, we use a cold-atom apparatus of rubidium-85 to experimentally verify our model. Besides these, we find our work can also serve as a benchmark to measure the polarization impurity of a circular-polarized laser beam with high sensitivities. We believe this work will bring convenience for most of cold-atom experiments using absorption imaging.
9 pages, 5 figures
References in corpus (20)
- Many-Body Physics with Ultracold Gases
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Observation of Bose-Einstein Condensation of Molecules
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Observation of the supersolid stripe phase in spin-orbit coupled Bose-Einstein condensates
- Tools for quantum simulation with ultracold atoms in optical lattices
- Observation of an Efimov spectrum in an atomic system
- Observation of scale invariance and universality in two-dimensional Bose gases
- Molecules of Fermionic Atoms in an Optical Lattice
- Strong saturation absorption imaging of dense clouds of ultracold atoms
- Evaporation of microwave-shielded polar molecules to quantum degeneracy
- Radio Frequency Association of Efimov Trimers
- Creation of a Bose-condensed gas of rubidium 87 by laser cooling
- An optical lattice with sound
- Strongly Interacting Two-Dimensional Bose Gases
- Ultracold Feshbach molecules in an orbital optical lattice
- Probing quantum many-body correlations by universal ramping dynamics