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We experimentally demonstrate a simple and robust optical fibers based methodto achieve simultaneously efficient excitation and fluorescence collection fromNitrogen-Vacancy (NV) defects containing micro-crystalline diamond. Wefabricate a suitable micro-concave (MC) mirror that focuses scatteredexcitation laser light into the diamond located at the focal point of themirror. At the same instance, the mirror also couples the fluorescence lightexiting out of the diamond crystal in the opposite direction of the opticalfiber back into the optical fiber within its light acceptance cone. This partof fluorescence would have been otherwise lost from reaching the detector. Ourproof-of-principle demonstration achieves a 25 times improvement influorescence collection compared to the case of not using any mirrors. Theincrease in light collection favors getting high signal-to-noise ratio (SNR)optically detected magnetic resonance (ODMR) signals hence offers a practicaladvantage in fiber-based NV quantum sensors. Additionally, we compacted the NVsensor system by replacing some bulky optical elements in the optical path witha 1x2 fiber optical coupler in our optical system. This reduces the complexityof the system and provides portability and robustness needed for applicationslike magnetic endoscopy and remote-magnetic sensing.

Enhancing fluorescence excitation and collection from the nitrogen-vacancy center in diamond through a micro-concave mirror