A linearly polarized 532-nm green laser beam (Lighthouse Photonics Sprout-G 10 W) was used to excite NV centers. Laser pulses were generated by passing the continuous-wave laser beam through an acousto-optic modulator (CrystaLaser). A 0.8–numerical aperture aspheric lens was used to illuminate a 20-μm-diameter spot on the diamond and collect fluorescence. The fluorescence was separated from the excitation light by a dichroic mirror, passed through a linear polarizer, and focused by a 200-mm focal-length lens onto an amplified photodetector (Thorlabs PDB450A). Microwave pulses were generated using an I/Q modulated microwave generator (SRS SG384). RF nuclear π/2 pulses were generated by an arbitrary waveform generator (Teledyne LeCroy WaveStation 2012). A transistor-transistor logic (TTL) pulse card (SpinCore PBESR-PRO-500) was used to generate and synchronize the pulse sequence. Two data acquisition cards (National Instruments USB-3631) were used to digitize NV NMR and RF coil magnetometer signals. Helmholtz coils were driven by a HighFinesse Gmbh UCS 10/40 current source. A set of eight gradient compensation coils (NuevoMR LLC) was used to minimize spatial gradients in B0. The temporal drift of B0 was monitored with an NMR coil magnetometer (placed above the diamond detection volume) and stabilized using an additional pair of coils.

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