Optical trapping of CaF

We demonstrate a high-density RF magneto-optical trap of CaF molecules. Grey molasses cools the CaF molecules well below the Doppler limit to 30 uK allowing us to load the molecules into an optical dipole trap. Optical trapping lays the groundwork for many research directions, including ultracold collisions and chemistry, quantum simulations, and new precision measurements. A particularly promising avenue is constructing optical tweezer arrays of molecules, where one can realize full quantum control in a scalable platform.