用于金刚石 NV 色心量子磁强计的集成化光电系统研究

基于金刚石的磁测量系统因其稳定性、矢量性和常温光学读出等性质，具有广泛的应用前景，而激光器和光电探测器是金刚石电子自旋量子态操控和读出的关键器件，其性能直接决定磁强计的灵敏度。文章设计了一套为金刚石氮空位(nitrogen-vacancy, NV)色心磁强计定制的集成光电系统，包含超小型激光控制和光电探测模块。激光控制模块基于TPS54200芯片实现，输出光强可达$700\mathrm{mW}$ ；光电探测模块采用S13955-01光电二极管与AD8065运算放大器实现；两模块实物性能与商用器件相近，但结构更简单，体积和功耗显著降低。基于该集成系统，最终研制的小型化金刚石NV色心量子磁强计实现了 $\mathrm{nT / Hz^{1 / 2}}$ 量级的灵敏度，大幅超越此前 $\mu \mathrm{T} / \mathrm{Hz}^{1 / 2}$ 量级的工作成果，有望应用于航空磁探等领域。

The magnetic measurement system based on diamond, due to its stability, vector nature, and room-temperature optical readout properties, has broad prospects for applications. Among them, lasers and photodetectors are essential devices for the manipulation and readout of diamond electronic spin quantum states, and their performance determines the sensitivity of the magnetometer. This paper introduces an integrated optoelectronic system customized for diamond nitrogen-vacancy(NV) center magnetometers. The system includes ultra-compact laser control and photodetection modules. The laser control module is based on the TPS54200 chip, achieving an output power of up to$700\mathrm{mW}$ , while the photodetection module uses S13955-01 photodiode and AD8065 amplifier. Both modules have performance similar to commercial devices but with simplified structures, smaller volumes, and reduced power consumption. Using this system, the final miniaturized diamond NV center quantum magnetometer achieved $\mathrm{nT / Hz^{1 / 2}}$ -level sensitivity, significantly surpassing previous $\mu \mathrm{T} / \mathrm{Hz}^{1 / 2}$ -level performance. It holds promise for applications in areas such as airborne magnetic exploration.