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The current work proposes a method for pulsed-light polarization ofnitrogen-vacancy (NV) center electron spin. To evaluate the influence of pulsedspin polarization, we establish a polarization evaluation index based onpolarizability and polarization time. Master equation model are utilized totheoretically calculate the spin polarization dynamics under light excitationand the optimal polarization conditions for the conventional methods areobtained. A novel pulsed-light polarization method is proposed by changing theoptical pumping rate in the master equation from a fixed value to a timevariable and an optimal waveform for proposed method is demonstrated throughthe variational method, which can simultaneously achieve high polarizabilityand requires a short polarization time. Hence, the polarization evaluationindex is improved by ~10%. Moreover, the proposed method is verified by apulsed-laser experimental system based on an arbitrary waveform generator. Thecurrent report shall expand the application horizon of NV center based quantumsensing.

Optimal optical polarization of nitrogen-vacancy center with arbitrary waveform pulse