aqora

Engineering trapping potentials for ultracold polar molecules

Svetlana Kotochigova

Bulletin of the American Physical SocietyMay 29, 20100 citations

Optical phase aberration correction with an ultracold quantum gas

Paul Hill, Philipp Lunt, Johannes Reiter +3 more

We present an optical aberration correction technique for ultracold quantum gas experiments which directly utilizes the quantum gas as a wave-front sensor. The direct use of the quantum gas enables correcting aberrations that are otherwise impractical to measure, e.g., introduced by vacuum windows. We report a root-mean-square precision and accuracy of $0.01\ensuremath{\lambda}$ and $0.03\ensuremath{\lambda}$, respectively, and also show independently the reduction of aberrations through measurement of the trap frequency of our optical tweezer. These improvements were achieved for a tweezer size that is well below our imaging resolution. The present work is in particular intended to serve as a tutorial for experimentalists interested in implementing similar methods in their experiment.We present an optical aberration correction technique for ultracold quantum gas experiments which directly utilizes the quantum gas as a wave-front sensor. The direct use of the quantum gas enables correcting aberrations that are otherwise impractical to measure, e.g., introduced by vacuum windows. We report a root-mean-square precision and accuracy of $0.01\ensuremath{\lambda}$ and $0.03\ensuremath{\lambda}$, respectively, and also show independently the reduction of aberrations through measurement of the trap frequency of our optical tweezer. These improvements were achieved for a tweezer size that is well below our imaging resolution. The present work is in particular intended to serve as a tutorial for experimentalists interested in implementing similar methods in their experiment.

arXiv:2404.16827Physical Review ANov 12, 20244 citations

Resonant Control of Elastic Collisions in an Optically Trapped Fermi Gas of Atoms

Thomas H. Loftus, Cindy A. Regal, Christopher Ticknor +2 more

We have loaded an ultracold gas of fermionic atoms into a far-off resonance optical dipole trap and precisely controlled the spin composition of the trapped gas. We have measured a magnetic-field Feshbach resonance between atoms in the two lowest energy spin states, /9/2,-9/2> and /9/2,-7/2>. The resonance peaks at a magnetic field of 201.5+/-1.4 G and has a width of 8.0+/-1.1 G. Using this resonance, we have changed the elastic collision cross section in the gas by nearly 3 orders of magnitude.We have loaded an ultracold gas of fermionic atoms into a far-off resonance optical dipole trap and precisely controlled the spin composition of the trapped gas. We have measured a magnetic-field Feshbach resonance between atoms in the two lowest energy spin states, /9/2,-9/2> and /9/2,-7/2>. The resonance peaks at a magnetic field of 201.5+/-1.4 G and has a width of 8.0+/-1.1 G. Using this resonance, we have changed the elastic collision cross section in the gas by nearly 3 orders of magnitude.

arXiv:cond-mat/0111571Physical Review LettersApr 12, 2002229 citations

Ultracold Quantum Gases: Key Experimental Techniques

S. A. Hopkins, Simon L. Cornish

Cold atomsMar 18, 20130 citations

Potential Energy of a K 40 Fermi Gas in the BCS-BEC Crossover

John T. Stewart, John Gaebler, Cindy A. Regal +1 more

We present a measurement of the potential energy of an ultracold trapped gas of 40K atoms in the BCS-BEC crossover and investigate the temperature dependence of this energy at a wide Feshbach resonance, where the gas is in the unitarity limit. In particular, we study the ratio of the potential energy in the region of the unitarity limit to that of a noninteracting gas, and in the T=0 limit we extract the universal many-body parameter beta. We find beta=-0.54_{-0.12};{+0.05}; this value is consistent with previous measurements using 6Li atoms and also with recent theory and Monte Carlo calculations. This result demonstrates the universality of ultracold Fermi gases in the strongly interacting regime.We present a measurement of the potential energy of an ultracold trapped gas of 40K atoms in the BCS-BEC crossover and investigate the temperature dependence of this energy at a wide Feshbach resonance, where the gas is in the unitarity limit. In particular, we study the ratio of the potential energy in the region of the unitarity limit to that of a noninteracting gas, and in the T=0 limit we extract the universal many-body parameter beta. We find beta=-0.54_{-0.12};{+0.05}; this value is consistent with previous measurements using 6Li atoms and also with recent theory and Monte Carlo calculations. This result demonstrates the universality of ultracold Fermi gases in the strongly interacting regime.

arXiv:cond-mat/0607776Physical Review LettersNov 30, 2006154 citations

Toward the individual trapping and probing of ultracold polar molecules

Michael Highman, Ming Li, Svetlana Kotochigova +2 more

Bulletin of the American Physical SocietyMay 31, 20190 citations

Precision measurement of a trapping potential for an ultracold gas

Related papers

Precision measurement of a trapping potential for an ultracold gas

Related papers