Optoelectrical Cooling of Polar Molecules to Submillikelvin Temperatures
Optoelectrical Cooling of Polar Molecules to Submillikelvin Temperatures
We demonstrate direct cooling of gaseous formaldehyde (H2CO) to the microkelvin regime. Our approach, optoelectrical Sisyphus cooling, provides a simple dissipative cooling method applicable to electrically trapped dipolar molecules. By reducing the temperature by three orders of magnitude and increasing the phase-space density by a factor of ~$10^4$ we generate …