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Subfemtotesla radio-frequency atomic magnetometer for detection of nuclear quadrupole resonance
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of the sample, boron nitride (BN) container, and the K cell inside a hot air oven. (b) Radio-frequency atomic magnetometer setup showing the pump and the probe beams, a rf (aluminum) and a static (mu metal) magnetic field shield, and balanced polarimeter. The offset field coils, not shown, are directly wound on the two vacuum tubes along the pump beam direction close to the K cell. LP, linear polarizer; , quarter-wave plate; BS, beam splitter; PD, photodiode.

Image of FIG. 2.
FIG. 2.

Noise spectrum of the magnetometer obtained with (light solid line) and without (dotted line) a rf calibration field. The heavy solid line shows the noise when the pump beam was shut off. The photon shot noise corresponded to . The inset shows the resonance half-width as the pump beam power was varied.

Image of FIG. 3.
FIG. 3.

(a) Timing diagram of the excitation and refocusing rf pulses and offset field pulses. (b) Lock-in detected NQR signal from powdered ammonium nitrate. The dashed line is a single exponential fit with a rise time of . The inset shows a Fourier transform of the signal obtained in a different run, with total -limited acquisition time of . (c) The NQR signal amplitude as a function of the excitation field strength. The solid line is a fit to the function following Ref. 11 .


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Scitation: Subfemtotesla radio-frequency atomic magnetometer for detection of nuclear quadrupole resonance