Dong Sheng

Subfemtotesla Scalar Atomic Magnetometry Using Multipass Cells

Scalar atomic magnetometers have many attractive features but their sensitivity has been relatively poor. We describe a Rb scalar gradiometer using two multipass optical cells. We use a pump-probe measurement scheme to suppress spin-exchange relaxation and two probe pulses to find the spin precession zero crossing times with a resolution of 1 psec. We realize a magnetic field sensitivity of 0.54 fT/Hz(1/2), which improves by an order of magnitude the best scalar magnetometer sensitivity and exceeds, for example, the quantum limit set by the spin-exchange collisions for a scalar magnetometer with the same measurement volume operating in a continuous regime.

Preliminary studies for anapole moment measurements in rubidium and francium

Preparations for the anapole measurement in Fr indicate the possibility of performing a similar measurement in a chain of Rb. The sensitivity analysis based on a single nucleon model shows the potential for placing strong limits on the nucleon weak interaction parameters. There are values of the magnetic fields at much lower values than found before that are insensitive to first order changes in the field. The anapole moment effect in Rb corresponds to an equivalent electric field that is eighty times smaller than Fr, but the stability of the isotopes and the current performance of the dipole trap in the apparatus, presented here, are encouraging for pursuing the measurment.

Lifetime measurements of the 5 d states of rubidium

We present lifetime measurements of the

Microfabricated Optically-Pumped Magnetometers for Biomagnetic Applications

5D_{3/2}

New classes of systematic effects in gas spin comagnetometers.

and

Lifetime measurements of the 5d states of rubidium

5D_{5/2}

Magnetic field imaging with microfabricated optically-pumped magnetometers

states of rubidium using the time correlated single photon counting method. We perform the experiment in a magneto-optical trap of

Optical rotation in excess of 100 rad generated by Rb vapor in a multipass cell

^{87}

Sensitivity test of a blue-detuned dipole trap designed for parity non-conservation measurements in Fr

Rb atoms using a two-step excitation with the trap laser at 780 nm as the first step. We record the 761.9 nm fluorescence from the decay of the

A microfabricated optically-pumped magnetic gradiometer

5D_{3/2}