Figure 4: Details of ensemble measurement setup and pulse sequences.
From: Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit systems
(a) Diagram of the NV wide-field fluorescence microscope. The laser produces 532-nm light, which is switched by the acousto-optic modulator (AOM) and directed through a dichroic mirror and an objective onto the diamond sample. The fluorescence from the sample passes through the dichroic and, following an optical chopper and appropriate filters, is collected by a charge-coupled device (CCD). (b) Pulse sequence used to perform spectral decomposition measurements with the NV wide-field microscope. Optical pulses are used to first initialize the NV and then to readout its spin state. The optical chopper is synced such that the initialization pulse is blocked from the CCD, while the readout pulse is recorded. The microwave pulses are applied between the initialization and readout optical pulses.
