Microfabricated Active Laser Noise Suppression Device for a High-Sensitivity Diamond Quantum Magnetometer

• DOI: 10.1021/acsphotonics.4c01825
• Publication Date: 2025-01-18T15:49:46Z
• Authors: Nan Wang; Yichen Liu; Yongquan Su; Xiao Peng; Yuqiang Hu; Qihui Liu; Fei Xie; Yaochen Zhu; Xin Chen; Xin Luo; Yonggui Zhang; Lihao Wang; Maoheng Jing; Chun Li; Shaoxiong Nie; Hao Chen; Zhenyu Wu; Jiangong Cheng
• Keywords: Quantum sensor

Nitrogen vacancy (NV) centers in diamonds have emerged as one of the most promising candidates for magnetic field sensing. However, laser intensity fluctuation is coupled to diamond fluorescence; thus, sensitivity severely affected by noise and stability laser. Integrating both quantum sensor suppression device a crucial step toward miniaturization practical applications. Here, we present piezoelectric-driven dynamically adjust cancelation with dimensions 5 × 1.5 mm3 based on grating interferometer. This incorporates structure produce diffracted reference light high-accuracy modulation, actively tracking fluorescence signal differential common-mode rejection (CMR), effectively eliminating system, whereby detection increased factor 34, reaching 160 pT · Hz–1/2, beneficial long-term stability. The compact design this suppressor, combination miniaturized magnetometer, demonstrates its potential high-precision ability strong portability.