Abstract
Optical magnetometers are important in a myriad of applications requiring highly sensitive measurements of magnetic fields. However, the presence of technical noise often degrades their performance severely at low Fourier frequencies, thereby preventing their use when high stability over long time scales is needed. This study demonstrates an ultrastable optical magnetometer that exhibits high sensitivity across $e\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}h\phantom{\rule{0}{0ex}}t$ orders of magnitude in Fourier frequency. The contributions of a multitude of noise sources, both fundamental and technical, are investigated. The measured noise floor is primarily limited by magnetic field fluctuations, not the sensor itself.
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