科研之友
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摘要
An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated experimentally. We build an 894 nm external cavity diode laser which is frequency locked to the F = 4 -> F' = 3 transition of Cs D-1 line with DAVLL spectroscopy. With the phase-locked loop, the frequency of the rf coils is actively locked to the Larmor frequency and the magnetometer tracks the magnetic field variations in a phase coherent manner. An ultimate sensitivity of 19 fT/Hz(1/2) and an intrinsic sensitivity of 8.6 pT/Hz(1/2) in the magnetic environment which is close to geomagnetic field have been achieved with the spatial resolution smaller than 2 cm.
- 出版日期2012-10
- 单位浙江大学
