All optical hyperpolarization of electron and nuclear spins in diamond
Low thermal polarization of nuclear spins is a primary sensitivity limitation for nuclear magnetic resonance. Here we demonstrate optically pumped (microwave free) nuclear spin polarization of 13 C and 15 N in 15 N doped diamond. 15 N polarization enhancements up to 2000 above thermal equilibrium are observed in the paramagnetic system N s 0. Nuclear spin polarization is shown to diffuse to bulk 13 C with NMR enhancements of 200 at room temperature and 500 at 240 K, enabling a route to microwave free high sensitivity NMR study of biological samples in ambient conditions.