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Most of dynamic nuclear polarization (DNP) has been requiring heliumcryogenics and strong magnetic fields for a high degree of polarization. Inthis work, we instead demonstrate an optical hyperpolarization of naturallyabundant $^{13}$C nuclei in a diamond crystal at a low magnetic field and anambient temperature. It exploits continuous irradiations of pump laser forpolarizing electron spins of nitrogen vacancy centers and microwave fortransferring the induced polarization to $^{13}$C nuclear spins. Tripletstructures corresponding to $^{14}$N hyperfine splitting were clearly observedin the spectrum of $^{13}$C polarization. The powers of microwave irradiationand pump laser were optimized. By simultaneously irradiating three microwavefrequencies matching to the peaks of the triplet, we achieved a $^{13}$C bulkpolarization of 0.113 %, leading to an enhancement of about a factor of 90,000over the thermal polarization at 17.6 mT. We believe that the multi-toneirradiation can be universally adopted to further enhance the $^{13}$Cpolarization at a low magnetic field.

Optical dynamic nuclear polarization of $^{13}$C spins in diamond at a low field with multi-tone microwave irradiation