A low-power, high-sensitivity micromachined optical magnetometer

  title={A low-power, high-sensitivity micromachined optical magnetometer},
  author={Rahul Mhaskar and Svenja Knappe and John E. Kitching},
  journal={Applied Physics Letters},
We demonstrate an optical magnetometer based on a microfabricated 87Rb vapor cell in a micromachined silicon sensor head. The alkali atom density in the vapor cell is increased by heating the cell with light brought to the sensor through an optical fiber, and absorbed by colored filters attached to the cell windows. A second fiber-optically coupled beam optically pumps and interrogates the atoms. The magnetometer operates on 140 mW of heating power and achieves a sensitivity below 20 fT/√Hz… 

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