  We propose a new, more efficient, and potentially cost effective, solid-state
nuclear spin hyperpolarization method combining the Cross Effect mechanism and
electron spin optical hyperpolarization in rotating solids. We first
demonstrate optical hyperpolarization in the solid state at low temperature and
low field, and then investigate its field dependence to obtain the optimal
condition for high-field electron spin hyperpolarization. The results are then
incorporated into advanced Magic Angle Spinning Dynamic Nuclear Polarization
(MAS-DNP) numerical simulations that show that optically pumped MAS-DNP could
yield breakthrough enhancements at very high magnetic fields. Based on these
investigations, enhancements greater than the ratio of electron to nucleus
magnetic moments (>658 for 1H) are possible without microwave irradiation. This
could solve at once the MAS-DNP performance decrease with increasing field and
the high cost of MAS-DNP instruments at very high fields.
